Chevy 350 wont start backfire IT WONT START AT ALL AND SOUNDS LIKE BACKFIRE. She will caugh through the carbs on initial cranking, but once she fires up, the condition goes away. just getting into fixing his own stuff and decided he would change the valve cover gaskets on his 72 short wheel base Chevy. I put a new starter in. Once it starts, it will start instantly anytime afterwards until it sits again. Search Fixya How do i set timing on 1998 chevy truck 350 vortec. Mar 18, 2008. I figured I'd register on the forums to get more detailed information. Anytime you can reproduce a problem in the bay it is much easier to diagnose than it is on the About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Chevy Forums FREE technical assistance for your restoration and repair. Symptoms: Hello guys I ran into a problem that just started last Monday and I know its not carb related cause it does not matter what one I had on its all the same symptoms. My issue is I have the most extreme sounding backfire that I’ve ever heard. 4. Battery is good. It idles smoothly and revs fine in park. if not your looking at bad valves which is not a common thing on these engines 1968 Short Fleet 350 Constant and consistent backfire in exhaust, seems to be mostly on the cold side. silver bullit. I thought maybe I was 180 out. Cold start she revs to who knows, its high, and stays for a long time. everything else stock. #9 in electrical section. It has ported 882 heads that are freshly decked with new valve guides, valves and springs, new cam and I have a 1995 chevy s-10 4x4 4. Wisconsin certified emissions state inspector Chevy Camaro Backfire Diagnosis. Model specific subject matter experts, classified ads and more. Pumping the gas does not help. ASE A couple weeks ago he said it was starting to miss or run like s**t. dropped in teens one morning it wouldn’t start. Allison Feb 19, 2010 72 chevy 350, edlebrock 1501 carb. Thread starter Joshsheff; Start date Feb 10, 2022; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. Cap and ensure that when the rotor is If he got a backfire then there's a possibility something ignition wise is wrong even with spark, and even though it seems like a fuel issue. everything was good until a couple weeks ago. : 00-06-04-014 Date: April, 2000 TECHNICAL The famous chevy 350 backfire. I brought it to top dead center and the distributor was about 180* out. AMEDEE. when you try to pull out in it loads up bad. Tags backfire small block chevy supercharger won't idle won't start. ( I'll adjust the valves once the engine is running). 46 with mild 350 (Vortec heads, Performer intake, 600 Holley, 268H Comp cam, MSD 6A, TCI 2400 Breakaway, 3. 480 int ext lift. Stripped it down past the I have been searching through back postings about the backfiring through the exhaust and have tried some of the fixes but still backfiring. Has new 4 brl. it has tried to start but has not fired. You should be able to look down the primaries and see/smell fuel as you pump the gas. Last edited: Apr 10, 2024. Share Troubleshooting - backfire through carburetor. Runs great otherwise. car starts fine. My motor seems to be missing/backfiring once it warms up (about 10 minutes) and I go from an idle THE VACUME ADVANCE WEIGHTS WERE STICKING ON MY OLD 78 VETTE,SOMETIMES THE TIMEING WAS SO FAR OFF IT WOULD NOT EVEN START,OR BACKFIRE OUT THE EXHAUST OR CARB,I R&R'D THE DISSY WITH A NEW ACCELL. Bad Ignition Timing. C6 Grandsport Brake Install C6 Z06 Wheels T56 Installation Manual. The general rule of thumb is to tighten the adjustment screw(s) into the carburetor with a screwdriver while the engine is idling until the engine speed starts to increase, then loosen the screw(s) half a turn. The problem started before winter. Post: Troubleshooting 350 TBI no start (Topic#300296) sloop Forum Newbie Posts: 4 Reg: 07-24-13. 7 350 TBI. Sensor was bad. it takes gas great when your reving it but if you rev it high it sounds like a cannon going off out the exhaust. Joshsheff Junior Member. but now it is My 2000 7. So what does this have to do with the O/P? Not much, but you really should get a timing light and run 350 sbc exhaust backfire. Save Share Reply Quote Like. Alright so I have a 1984 350 engine with headers, edlebrock performer intake and edlebrock 650 thunder series carb. After 2k it was time to readjust the valves after they fully seated (roller cam with rocker arms and pushrods). it seems to poof or puff or backfire out the carb when i give it gas. 10's. Therefore, you should check the EGR Since then every time i try to start it , it will backfire through the carb. Worked AOK 3 weeks . If it starts under WOT (Wide Open Throttle) is an indication of a faulty CTS. i adjusted the mixture screws and cleaned w carb spray best i could on my 1 year new edelbrock 1405 (600cfm) carb and it seemed to help. After doing this for a while i will be able to start it and it will idle fine and rev up with gas. 1994 Chevrolet K1500. I know the timing is correct. I look at it offer my condolences. Now , the "no start in damp weather / rain" issue has just returned . Fuseable link on start good. I replaced the engine 2 years ago with an ATK remanufactured long block and I’ve only put 2000 miles on it since then. Defiant. The guy i bought it from said the previous owner did some work to eliminate the EFM system on it. 3 Replies. Save Share Tried starting it again and now all it does is turn over but won't start. ), she starts just fine - no backfire. 20. I can here the fuel pump running. Our Community is 940,000 Strong. hydraulic lifters. Ok recently got my truck on the road. Discover common causes like battery and alternator failures, plus get repair estimates on RepairPal. It acts like there is no fuel in the carburetor and needs to crank for several (4+) tries before it starts. pull # 1 plug and manualy bring the motor up to SBC 350 Engine Backfire Through Exhaust and Carb Engine & Drivetrain Register or Log 1965 Chevy Bagged,361 sbc,voodoo cam,1. Save Share Then, the truck will run perfect. #5 & #7 are on the driver side, the closest to the back. 7l 350 Vortec. timing chain. It is a flat tappet cam but we ran zinc in break in and still do so worn down lobes is unlikely. 5 turns all carbs) made the car run like crap, so not sure if would have helped the backfire. Maybe the dist worked loose? try I have a 350 chevy, I can get it to fire up if I push in the pedal while I turn the key. 1988K1500since1999. Loud Backfire. 78 formula orig. Members enjoy round-the-clock access to 12,000+ verified Experts, including doctors, lawyers, tech 350 chevy wont start. Backfire, flipped 180, backfire. , intake, dist. what was max. User Info. Once both sets of valves are closed, that's when the spark will fire inside the cylinder -- or at least that's when the spark is supposed to fire. Also check the mechanical advance. C10 with a 305 with the stock quadrajet. I have an engine heater installed, if I use that to heat the engine to around 65f it starts right up. 2. Fuel pressure tests food. I can see multiple vacuum hoses plugged and not hooked up. Sometimes it spits just fuel and other times it will actually catch on fire. 25:1 CR 4 bolt main Turbo350 Made April 7th 1970 at the Willow Run plant in Bad plug wires can also short onto each other and cause the wrong cylinder to fire while it's intake valve is still open, igniting back into the intake. Feb 10, 2022 #1 J. So I give it one more shot and it will seem to want to start and some times it will backfire through the carb. 7L 350 TBI Engine. I have found the numbering of the firing order on each cyclinder, but where. I already replaced the coil about a month or so ago. i thought it was the carb. Same truck that is hard to start in previous thread. Checked the accelerator squirt in the offending carb and seems to be doing its job. Replaced crankshaft sensor and ignition coil truck still wouldn't start. Ok its a 91 ls bottom end, 94 gsr top end. 1 2. 6 Car still has a hard time starting and will backfire through the carb if it is about to die and you give it gas to keep it running when it's cold. Sometimes it will start fine and run. 10,124 Satisfied Customers. what could be my problem? I have a 1960 chevy truck - the engine says its a 350 but I could swear the guy said it was a 305. wonder if that's whats going on with yours. Ordinarily, it takes a little finesse to start it, but it always starts. because it had wasp nest in brake drums! 1972 chevy pickup 350 won't start keeps backfireing out the carb. Truck ran fine with no indication of problem. Current build-2002 Chevy truck buggy, 06 front clip tube-coilovers,bypasses-8. I've got a 350 Chevrolet, 5. Then a day later it quit running and wont start. WarSaw; Feb 9, 2008; Newbie Forum; Replies 12 Views 17K. I drove it without incident a couple of weeks ago. Once running check the timing with a light of coarse. and coil are also new. It would start and run for about a minute maybe 2 and then it would quit. but anyway ive been having a issue getting my 350 to run. Just picked myself up a fairly clean 88 Chevy K5 square body with a 350 TBI. Not all the reasons, but the biggest ones. small backfires. any idears? chevy 350, timing. It has good compression, fuel, and fire to the engine. if its a small block or big block chevy the firing order is 1-8-4-3-6-5-7-2 If you bring the timing mark (on the harmonic balancer) up at TDC on the Chevy Forums FREE technical assistance for your restoration and repair. As you probably already know, it runs ok here goes lol i have a 1981 pontiac trans am that origionally came with the 301 turbo i swapped in a small block 350 i built myself, the engine block was from an 84 corvette, stock crank, rods, pistons. It’s as loud as a gunshot. Decided to go ahead and try and start her up but I get backfire through the carb and no boom. carb. That won't cost you anything but time (and a 6 pack of beer for your friend). Well the problem is at start up. Still will not start just backfires through intake. sprayed carb cleaner in the intake/nothing. I was thinking about all the basic timing issues that might cause this. 60 327 camel hump 64cc heads,crane roller rockers,edelbrock performer carb,edelbrock torker 2 intake,b&m 3000 stahl converter,th400 trans w/b&m perf. cranked the engine over and got a consistent 6lbs of pressure. Once idling in Neutral it doesn't smell rich, with my nose in the tailpipe it seems fine. idles really rich has lots of power. and now the bike won’t start - only backfire. E. ; over 20 yrs. Holley LS Fest West. I can hear the fuel pump kick on, replaced the fuel filter, - Chevrolet 1998 K1500 question. Thanks for the help. you can give it gas steady for a few then let off and it will idle decent but you shut it off and start it does Was cruising around, everything was fine then she just dies on me. Pragueress. /18 with GM 2013 Jag XF, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3. 350 chevy wont cold start Jump to Latest 28K views 8 replies 4 participants last post by J. Ask Question Asked 6 years ago. TegraNonvtec91 Discussion starter. I bought some 95 Chevy 350 w/tbi backfiring through tbi. It is a 1985 Chev. i ended up replacing the Recently dropped in a crate motor from Jeggs into a 2000 Chevy C3500 SWB with the 5. The websites that have serial numbers listed dont have an i in them. 7l is a pretty bare block with little electronics but it has headers and an Edelbrock intake and carb and a Delco HEI Distributor. Still only clicks won't start. 7 350 vortec. 7L will crank but won't start. Bill Tichenor. Found no spark. Joined: Jan 22, 2013 3545# at the starting line, 10. Joined Feb 10, 2022 Posts 1 I have a 1988 c2500 with the 350 tbi, it wad running super rough and wouldn't hold idle so I checked the wires and found out they were going to the wrong plugs, I fix that and it won't start and only backfires while attempting to start, I've replaced the ignition coil, map sensor, distributor cap and the wires/plugs are fairly new. I have a 1990 Chevy truck with a 5. Replaced and all works well now. Latest Articles. you might want to do a leakdown test to see if you dont have a valve leaking. 10 G80 1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF then once you start it the filter wont allow enough fuel in and kill the engine. My 1998 Chevy truck cranks but no start. All are good. On other chevy vehicles with distributor, you start with cylinder 1 and then use the firing order to place plug wires around the cap. 7, when cold start (temperatur around 40f) it has started to what I believe is backfire in the intake manifold, it cranks for around 5 sec with a couple backfires and then starts and runs perfect. Jump to Latest It did backfire out of the carb (600cfm edelbrock) two times. Don - Mo Lurch. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. my brother used the wrong dot so the cam and crank were out of time with each other. ( read- blap, blap out of exhaust), stalled out with a resounding backfire and 3 Loud backfire car won't start, turns over. Come join the discussion about restorations, builds, performance Ok very frustrating- 164000 miles Car didn't want to start replaced the starter and it started a few days and died wouldn't jump thought the rebulit starter had problems replaced it. I have a 1991 K2500 with the 5. e. valves adjusted correctly. Fuel? Spark? You mentioned in your first entry about no fuel in the filter or ?? Hopefully you have verified that the carb is full of fuel. Checked fuses connections. If I shut the truck off and immediately try to start it again, it will start normal and runs perfect. 7, back a few months ago I was going up hill and started to stall so I floored it and then I had engine ping got back home moved my timing little back the pickup Backfire in the carburetor is a condition that occurs when the air-fuel mixture in the engine combusts outside of the engine. 10 deg BTDC -still backfiring sb 350 chev backfires and wont start Nonspecific Car Forums . 07-24-13 06:27 AM - Post# 2366070 1988 350 tbi crank/ no start and backfiring through the intake. Truck was completely restored 20000 miles ago so 1979 SCLB C20 Q-jet 350 SM465 14b F. 7 liter 350 chevy pickup cranks but wont start backfires through throttle body while cranking it over? Monday, January 30th, 2012 AT 6:33 PM. Discussion in 'The Hokey Ass Message Board' started by 1950kale, Aug 21, 2013. Next day when weather is dry , it fires right up. Am I 180 out? Would it run (even with pushing the accelerator in) if I was 180 out? Also, I have a 1968 muncie trans and the hurst shifter is out of alignment. Backfire can damage I can't figure out what's happening with my sbc 350. The engine is stock except for an HEI distributor (GM). Right know it backfires like crazy out the exhaust. 10. Automotive Forums . 1974 Chevy El Camino Classic 350 1976 Pontiac Trans Am 455 Chevy 350 power loss/backfire. Even with starting fluid it only putts a I have fuel, spark but I'm getting TBI backfire on my 1996 Chevy 350 5. Reactions: fast 99 and Redfish. Ignition timing and EGR valves getting stuck wide open are the reason why Chevy 350 TBI won’t start that even has spark and fuel. Save Share If it acts like it wants to start, but won't, I sometimes try putting the gas pedal to the floor while trying to turn the engine over. it would show it had good spark, but it just wouldnt kick ya know. carb. However, if the spark timing isn't just right, the spark could fire too early before the intake valves are closed, or too late when the exhaust valves have already opened. DOCFIXIT MECHANIC; 18,828 POSTS; It sounds like the engine has lost timing like the timing chain has jumped. im almost possitive ive got timing right on ive done this job alot in the past but never had such a issue. Since i bought the engine, we've screwed with re:69 chevy backfire on deceleration you say 160 psi was min. it has become hard to start and started running rough when cold and hiccuped when i hit the gas. HEATHERH1999 MEMBER; 1999 CHEVROLET SUBURBAN; V8; 4WD; AUTOMATIC; 20,900 MILES; Engine - No/Hard/Slow Start/Backfire/Kickback Notes File In Section: 06 - Engine/Propulsion System Bulletin No. I followed directions for a chevy 350. Join Us. 3 L "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of When starting, it fires and quits, it won't idle I'm getting flames out of the carb on occasion It will start, and it will run at higher RPM, but when I try to back off on idle speed, it stalls. I've just completed rebuilding my Suburban's 350 into a 383, and feels/sounds so, so close, and I'm not 100% sure what I'm 94 GMC TBI 350. Any ideas ? Answered by Don - Mo Lurch in 3 mins 16 years ago. Jump to Latest Nova NEWBEE Discussion starter. Modified 6 years ago. STEP 1: UPSTREAM EXHAUST LEAK For 2 years , 1997 Suburban 1500 starts AOK in dry weather . The best way to start is to start with the check engine light. I have tried a different TB and distributor. Jump to Latest No, no backfire before I started replacing parts. 12/02/2009. Jump to Latest Why the backfire, why it won't start? ~Sara heres my bus*****m Click to expand This forum has a lot of folks with good sound knowledge and experience to back it up and are willing to help. Mechanic replaced fuel pump in tank last month . 2002 3500 Express Van LS 5. #7 fires right after #5, by switching them I had caused #5 to fire too late / #7 too early hitting When I crank it over, it wont start up, but tries to. 5. My 73 (350 4bbl Quadrajet) is hard to start after it sits for more than a couple of days. Kansas Your top radiator hose won't necessarily be hot after 45 minutes run time - if the is it popping through the intake, if so, the dist could be 180 out. This changed. 7 starts then stalls - I have 1994 GMC 5. So here is my setup, 350, vortec heads #062 casting with 2. This is what I know about the engine & carb: 350 Small Block which was rebuilt; Weiand 142 supercharger with matching Holley carb (Holley 700cfm Supercharger Carburetor Model 4150) Competition Cam & Timing Chain ; ARP Headbolts; AFR Aluminum Heads; Block re-bored to . UPDATE Tail Pipe Backfire. 7 k1500 misfire/backfire. Jump to Latest 21 - 35 of 35 Posts. . Chrisn14 Discussion starter. An exhaust tail pipe backfire is caused by an excessive amount of un-burnt fuel remaining in the exhaust system or fresh air being allowed to enter the system which ignites a small amount of un-burnt fuel. 1998 chevy cavalier 2. However, it will now idle 5. Parts replaced so far: Distributor cap Rotor Starts right up, has good fuel pressure (~7psi) good vacuum (14") and after tuning the carb, seems to be running well at idle and under load without issue. hold 18psi vacuum. 1978 chevy 350. New plug wires. Had ignition module checked and it was bad. My engine has been backfiring through the carb, and it’s driving me nuts! Symptoms Backfiring: The engine makes loud popping noises when I try to accelerate. T. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. 8 Reasons Why You Can't Miss LS Fest West 2025! Staff Writer If the the distributor is installed 180 degrees out of sync, the spark will occur during the exhaust stroke, so the engine won’t start, plus it’ll backfire out of the exhaust and possibly out of the carburetor as the intake valves open. Has spark and gas. well the truck won't start at all and about the engine needs to be on top dead center of the compression stroke on cyl 1. Poor Performance: It feels like I’m losing power, especially on 11-30-13 08:19 PM - Post# 2403865 okay so all of a sudden my 94 c1500 5. I basically have to crawl through any intersection until it picks up a I have a 1994 chevy 350 5. Reply Go to shbox. When in rain / damp weather , engine cranks and cranks, but does not fire up . If you start the engine hot (well, hot for a boat is about 150 deg. Checked all these last night. It takes 2 seconds to load it up and won’t overheat the transmission in that amount of time. Hes only got on it hard a few times. Viewed 2k times 2 . However, this engine has a cold start backfire. Motor wouldn't run. Stock 72ish 350 SBC std bore, std stroke, block cleaned and honed. Choke will only work if its in the 40s or lower. 1971 Malibu - 13. Misfire - backfiring when turning over. Replaced it and still same problem. It has been starting and running fine. once it dies how soon before it can restart i. 1974 Chevy El Camino Classic 350 1976 Pontiac Trans Am 455 1997 Honda Valkyrie 6 cylinders,6 carbs. And as others have mentioned check fuel pressure. Question; Cranks but won't fire up 2g spyder N/T. If I try to fire it up without pushing the accelerator in it will crank but not turn over. I checked distributor timing, it appears to be way off. I brought it back within range to where it should start but now it back fires out of the throttle body while cranking and wont start. I’ll show you how to deduce the problems of a SBC 350 Crank no Diagnosing backfire through carb. well except for that time that I lost a starter bolt. This leads me to believe that the carb is the problem. 35 years Master Mechanic. They will provide you with vital information that’ll help you narrow down why your Camaro is backfiring. kit and trans pack. 3 posts · Joined 2011 Add to quote; Only show this user #1 · Aug 3, 2011. Lately I have been having problems with cars come in No start, no spark, 77 Chevy 350. 40s. Jump to Latest 55K views 39 replies 18 participants last post by shawn63 Aug 8, 2013 Gen1 350 with an Edelbrock Performer manifold and 1405 carb Mild Crane Blazer cam, Keith Black pistons, fuelie heads. Need some help with backfire through exhaust (Topic#273942) awsum55 Senior Member Posts: 8872 Age: 72 Loc: O. F. It starts and then dies. 09 PONTIAC- VIBE 1930 DeSoto CK Business Coupe- 350 Chevy Crate V8, 4-wheel disc Could the backfire have damaged my carb?? Somehow it is no longer getting fuel in the bowls at startup. Would crank normally but not start. 12. It only happens when I push gas pedal once to floor to activate choke. 7L, recently rebuilt (So I was told) with an I had issues with my 94 not starting, changed out the starter and it has been good ever since. I was surprised what fixed the problem. Customer: replaced engine thuderblt ignition 350 in boat wont start backfire thru carb and exhaust Mechanic's Assistant: Sometimes boat issues seem like they'll be really complicated, but end up being easy to fix. Three main causes for backfiring on a distributor engine. Replace HEI distributor and no start. Wont start, but has power. Reattach everything, start the car, turn it off, and I hear a gurgling noise coming from the carb. it acted the same way , backfire, ect. and otherwise the car runs well, but damn that backfire is loud. 10 bolt rear end w/ 3. Crank crank crank no start. 40 bore,2. 2010 I have a 1995 Isuzu with a 350 chevy engine. Jump to Latest 26K views 9 replies 7 participants last post by TegraNonvtec91 Feb 7, 2011. Jump to Latest 71 Nova 350 70 Nova 350. The truck starts right up and it loops along and won't quit but the moment you give it gas it bogs down and won't go over 1500 RPM without backfiring. 06-18-15 04:54 PM - Post# 2555695 92 chevy 350 5 speed 4x4 when you start it will act like its cammed and stall out. 1998 Chevrolet K1500. Runs great going down the road at steady throttle. compression even and normal on all cylinders timing is set at 7. 7 350 tbi wont start it has 93k miles, its getting fuel into the injectors, my injectors are working, fuel pump is working i hear it going on and its new as well, fuel pump relay, fuel injectors, fuel filter are all new, now to the ignition side the distributor is new, coil is new, ignition module, fuses, pick up Customer: 1972 chevy pickup 350 won't start keeps backfireing out the carb. The first thing you need to start with is a compression check. New pistons, rings bearings engine won't start after valve adjustment. Newly built Chevy 350 won't start. 6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 Won't start just backfires. will not start. It's always been a hard starter (choke sticks so I don't use it) usually took about 10 seconds to fire after sitting a month but if it had run within a few days it always fired right up but had a very occasional backfire while trying to fire. com Car Chat > Chevrolet > Nonspecific > sb 01-27-2004, 06:01 PM. Reasons why Chevy 350 TBI won’t start has spark and fuel. Problem is when I first start the truck in the morning (or after sitting awhile) and go to take off, it will chug, bog out, or barely go for a few seconds, then Chevy Forums FREE technical assistance for your restoration and repair. The truck was originally from California and is now in Pennsylvania. stallion88; May 21, 2008; Newbie Forum; Replies 1 Views 587. At the end of one crank session it backfired pretty bad through the carb. with 11:1 compression i feel that it should be around 180-190. then put a vacuum gauge on your engine. After repeated times of trying to start it will eventually start with the throttle fully pressed but have to keep it fully pressed just to keep it running at 1000 rmp. 73 w/Eaton posi) No matter how long you crank it 9not exceeding 60 seconds), the car won't start on its Chevy Pickup hard starting 96 Chevrolet K1500 Silverado 5. 1. It's not really bad once I get up to speed and I'm just cruising but gettin there sucks and is just plain embarrassing to Richening the mixtures (1. 030 I've gotten it to start, but wont stay running and timing is jumping all over the place. I checked # 1 cylinder, it has 125# and up compression. battery works and it cranks but just wont kick over. V6. no trouble codes stored in pcm. That's just a Ever since the backfire (thru carb) engine will not start. 350 chevy 101 block . check ignition but the ecm should fix timing in any position unless the cam sensor is bad. I tried adjusting the distributor 180 degrees from the point it was at at when i stopped cranking. I put on a new set of headers but had to take the camino to a repair shop for the exhaust pipes. Hello, my 1978 Chevy C10 is my daily driver to high school and it has a Chevy 350 5. Auto Mechanic 350 sbc wont start Jump to Latest 8. Measure the fuel pressure to make sure you aren't having a fuel pump problem. Any ideas?. I have seen plenty of engines with stuck hi everyone, hows it going. Low The patient is a SBC 350 with a quadrajet. Starter is good and fuel pump does engage. Check the Spark Plugs. And I just can't get it to run, here's what I've got: Fuel sprays normally on both injectors All spark plugs show blue spark Battery has been recharged and starter cranks normally Have tried starting fluid to get it to start but no signs of ignition. hooker super comp headers w/edelbrock mufflers. Sticky lifters can cause it too, but tends to be less often the case. 6-5-7-2-1-8-4-3 180 degrees out starting with tdc #1. holley electric I have a Chevy 350 in my 72 nova. There is not loss of power and the truck always runs like it is supposed to. 4l V8 350 Edelbrock carb. i did that to 1998 chevy 3500 7. In this guide, we are going to look into no-start problems when the engine turns over (cranks), but won't start. Try to "start" the truck with the solenoid wire disconnected and see if the voltage gauge goes to zero then. It sat for atleast a year. Opti is not like regular distributors, it has a completely different plug wire set up. I just rebuilt a 350 and I can't sort out the demon that is making it backfire and not start. 1-8-4-3-6-5-7-2 normal starting with tdc #1. Timing tdc dist rotor on number 1. The car averaged 10. Tried to replace the coil that didn't do anything. What would cause it to backfire thru exhaust on cold starts. I have a 87 Chevy 350 that was running good but latley it has been stumbling and backfiring when you step on the throttle heavy. Absolutely stumped! Now, all we can get it to do is backfire through the intake. Hey everyone, I have a 1996 Chevy C1500 with a 5. Will it start ok with starting fluid? A couple of things to check: 1. Chevrolet Silverado 1500 Won't Start; Dodge Ram 1500 Won't Start; Ford F-250 Super Duty Won't Start; GMC Sierra 1500 Won't Start; Ram 1500 Won't Start; Troubleshooting - backfire through carburetor; Carburetor Installation and Tuning. 10 min read Quick Start Tuning. GM Tech (Cam) GM Grand Master Technician 2007. 7L, Won't start. 99 Sierra Turns Over But Wont Start. 480 . i had that problem about 6 months ago. 82@98. 18,942 Satisfied Customers. It has been running just fine for a little while now I have a 29 model A coupe with 350. Steps to diagnose. 11. While parked the car idles well and has good throttle response with no misses or backfires. com his site has a diagram on it of correct opti plug wire attachment. I can't figure out what the numbers on passenger side engine pad mean: (im0826 4vp). 02/1. ZZDaryl. After he finished. Everything was running pretty good before all this mess. 11,138 Satisfied Customers. Edelbrock 600cfm carb is 6 months old. no start. I have a 1988 c2500 with the 350 tbi, it wad running super rough and wouldn't hold idle so I checked the wires and found out they were going to the wrong plugs, I fix that and it won't start Just finalized my Vortec head swap and could only get the oil pressure up to 15psi. Backfires thru carb and will not start. If you click them and make a purchase, we may earn a small commission. This is my small block chevy 350 with hei distributor. It starts really rough (have to pump the gas a bunch). Double checked the Let us know if you are getting a tailpipe backfire and we'll go over that. 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer Hi, I have a tahoe 96 with the vortec 5. 10 min read Video. Apr 11, 2024 I'm trying to start a freshly rebuilt SBC. Once it starts, it idles OK, but driving it seems like its misfiring and not responsive at all when I press the gas and bogs when I'm not giving it gas. It will occasionally backfire through the carb. 14 You don’t have to go all the way to 4,000 rpm. So, I have just been letting it sit the last 2 days. multiple turns or till it cools down 73-87 Chevy _ GMC Trucks » Engine/Drivetrain » Engine starts There is often a backfire or two when this happens. Expert. backfiring. You could have a spark problem too. Jump to Latest 4- hard starting, backfire thru carb is to much advance or valve not shutting on intake. It doesn't backfire with the dist. Many times the additional load shows the problem at a lower rpm than what you experience on the open road. Replaced the fuel pump relay started and was able to go to store and back home. The spinning freely issue is completely fixed with the new starter clutch. If it is on, you can pull the diagnostic trouble does with a good code scanner. This can happen if the mixture is too lean or if there is an ignition timing issue. Have replaced spark plugs, had starter and battery tested. 100 long push rods, comp 3. So i start it up and it idles fine, but when ever i give it gas or when i drove it down the street it backfires out of the driver side exhaust and gets worse and worse the higher rpm i go. run it at idle, if the needle is in the proper range but twitches back and forth slightly Troubleshoot your GMC Sierra 3500 won't start issues. The engine will Probably the most likely cause is a crossed spark plug wire. Now it wont start again. msd 6al with msd distributor new wires and plugs My fj40 ran great last week I installed front and rear lockers drove it to the gas station and filled with regular gas (i usually use premium) and now it wont idle below 1100 rpm with out dying. Check Out the Latest Top Trucks Report! i have a 1994 chevy pick-up with a 350. He doesnt run it hard at all. Chevrolet Cert. (Does not even act like it is going to start) The mechanic got frustrated and put the old distributor back in yet put the new cap and rotor on it. 7 that will start and run for a few seconds then quit. Hi, I'm having problems with my freshly rebuilt 350 in my 74 Z. Let it sit for a few seconds and try again it will start then die. backfires out intake. 7L V8 SFI 350 in Liberia. 350 chevy firing order is 18436572. and coil are also 1999 CHEVY MALIBU: V6. Try moving the distributor a bit clockwise to see if it starts. P. A couple days after driving it, the temp dropped into the single digits. Did a tune up on it last year. I tried the 1/4 drill bit trick but I still cannot get reverse!! 350 chevy 350 edelbrock carb sbc small block. the bummer was he bent acouple valves. Tell me a bit more about what's going on so the Marine Mechanic can help you best. GM: im Backfire through exhaust or intake? is it stumbling (trying to start)? does it sound like its firing early or late or just making backfire noises. I need a diagram for a 1994 chevy silverado fuse box. I've loosened the valve lash to zero lash to eliminate the backfire. Just pop pop pop all the way up through the rpm range. 350 sb, new 600 holley carb, new wires, plugs, cap and rotor. 28 year experience, Master Mechanic. This truck spits,pops,backfires through the throttle body under throttle pressure. Very seldom, the truck will try to 350 Supercharged Small Block - Backfire and Won't Idle. The computer module has been changed out and. If the dist is 180 out, it won't run at all, only backfire, stumble, and sneeze. Coming home the other day it just started coughing and backfiring through the carb. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board: 87 TBI 350 runs rich, stalls, stumbles, slight backfire out exhaust 350, in the 55 - last year - started to backfire thru the carb when I would get into it - well after complete tne up, changed carb from edelbrock to holley, complete new distributor, all new wires, plugs, played with timing I'd start with checking/changing accelerator pump as well as readjusting float levels/settings. com: User Name: Remember Me? Password: Home: I have a 72 Blazer with a 350. Thread starter garzas23; Start date Feb 26, 2015; and you have power at the B terminal - but it still won't crank - next thing is to look closely at your main ground cable. I have a 71 Chevy Nova with a 350 motor. Power unplugged because there's no "fire" to create one. It'll pop and snort but won't run. car may have sit for awhile before I got it. 73 gears,new bearings,seals,and gears. to distributer I have a 1940 chevy coupe streetrod with a early 70's 350 chevy engine, I have set the timing, new plugs, new plug wires, new distributor cap and rotator cap, it back fires at high rpms thru the carb not the exhaust. 60,vortec weiand polished intake,demon carb Just want to make sure you avoid future issues. I also replaced the complete distributor Chevy 350 TBI out of a 92 Chevy 1500 pickup (was a crate motor) Driving last week, and it stalled and can't get it started noticed coil wire disconnected from distributor, plugged back in, truck turns over, just won't start First checked to see if I was getting fuel, pump kicks on and fills the bowl 1995 Chevy 5. 7 L 4L60E NV246 ARB '07 K1500 Suburban LT 5. Share: Facebook Reddit Pinterest Tumblr WhatsApp Email Share Link. It starts to backfire through the carb when I get on it at all and above 3000 rpm. The source of a "cranks, but no start" problem on yourChevy 350 distributor installis most likely incorrect distributor alignment with the harmonic balancer or a mismatched balancer and timing tab re: 350 cranks but wont start. Let me tell you what I did and see if you can help me figure out how to get back to It doesn't backfire or miss when its at a high rpm (2000+) but when i let off the gas and it goes back to ~800 it will die. water wont float on top of gas is what i was tought in science class _____ 71c-10 350/2004r/4:11 lowered3/4 1988 - 1998 (GMT400) - 1994 5. vehicle backfires thru intake. 5-1 compression, a comp cam 280H cam with . 4L has backfire in exhaust with throttle just off idle, add more throttle and runs fine Chevy 350, No. 02-1. 5 tires. This will shut down the injectors and go into "clear flood" mode. 75 posts · Joined 2023 Add to quote; Only show this user The Cheap rehab '79 Chevy truck is running pretty good, but still has a nagging misfire. I have replaced the fuel pump with an AC-Delco. Backfires on cold start. 4L Vortec K3500 won’t start. Here is a guide to help you check the timing chain. fuel pressure between 5 and 7 consistently 1985 gmc 1500, 350, th350c auto. I then got frustrated and gave it 3 more shots and pulled my choke and then it ran fine 350 MisFire / BackFire. Have you triple checked that the spark plug wires are to the correct spark plugs? edit: TexasRed, ya' beat me When you get "backfiring" thru the carb, that is usually a sign of an open Intake valve/s. If your engine won't crank at all, or cranks very slow, or the security light stays on, check the first part: Car won't start: 3 common causes. Pop off the drivers valve cover as well as the dist. A recent compression test and plug analysis reveals that the bottom 1986 C-10 Silverado 350 CI 260 HP, Edelbrock 1405, TH400, 2. Initial timing is 8 degrees BTDC (confirmed by turning engine over with fuel off and using timing light), vacuum plugged, verified that timing is set on #1 and 2017 KTM 350 sxf wont start, only backfires Facebook; Twitter; Youtube; Instagram; Pinterest; Newsletter; 2017 KTM 350 sxf wont start, only backfires. 1999 Chevy Suburban 1999 Suburban won't start. is the michael 17 ASE Cert. Doesn't almost catch either, once it starts it starts directly just takes it turning over about 5 or 6 seconds, warm or cold. I've tried rotating the dist. . Another quick remedy 350 crate motor backfire, not starting. 5 full roller rockers,patriot 185cc vortec heads 2. 180, 2. lean out with carb and motor just dies. Won't start anymore. Jetting that is badly too lean at lower elevations 77 chevy: a 350 and a 4 speed trany. So. May 22, 2008. It would be best to start with what is The back fires are soo bad I am afraid I will shatter the plenum if I keep trying to start it! I have gone so far to pull the valve cover over #1 and verify it was tdc, both valves shut after intake pull, and the rotor was at #1 (on the arrow) and have minimal play in the rotor. Dustin Hawkins. I even pulled off the front Fire blowing out of carb, new engine won't start. 476 posts · Joined 2008 Add to quote; Only show this user #1 · Feb 7, 2011. It has 96,555 total miles on it. 3l V6 throttle body and wont start until u spray starting fluid in throttle body runs. exp. I don't know what else to do!! Most of the carburetors installed on the 350 use a single air/fuel mixture screw, while some carburetors use two. New chevy crate motor, edelbrock manifold and carb with new MSD 8362, electric fuel pump (regulated). 2000 catera won't start. Then the timing marks on the crank pulley can be checked. Have you verified your ign timing with a timing light? Check over you vacuum advance if equipped. then offer to buy it just Re: chevy 1500 backfire not hard at all just takes 2 ppl remove the dist cap with a socket on a breaker bar connected to the crank shaft front bolt turn it backwards a little when the second guy sees the rotor turn you can stop mark the balancer with a reference point on the timing mark now turn it back the other way slowly and when the other guy sees the rotor Engine is a 350 small block chevy with mild gm zz4 roller cam and old style HEI distributor and a holley 600 carb with manual choke. Jump to Latest Won't be true if the carb is too lean to start with, you only go leaner with higher altitude if the carb was already running correct at sea level. ASE certified tech ADVANCED LEVEL SPECIALIST. 2010. Here is the engine specs. It's always been a hard starter taking between 8 and 12 revolutions of the engine before it catches. I have tried everything to get the truck to start. If your car has a push button start system, read this guide: Why a car i have a 1970 gmc 3/4 ton w/ 350 & 350 trans. He panicked and called me over. , Heavy Line Mech, Race Shop Owner, Mobile Electronics. On one of those days I tried to start it without success. 4 liter. Virtual Wrench. 7L Vortec, I got the truck recently and was told it just needed a Fuel pump, I replaced the Fuel pump, and the Filter, also the pump turns on and there is fuel up at the rail, I pushed the pin and it shot right out. 73's - rescued from the junkyard - Farm Truck, daily driver! Take the wire loose from the starter solenoid and isolate it so it won't touch anything. Went through the traps at 7800. 7 TBI it's a 1996 G30 van I've checked the wiring I have a 1990 350 tbi and it has fuel and spark but it just cranks and won’t start, I have replaced the ignition coil. 7 Litre 350 Vortec Auto Trans No Aftermarket Stuff 170 K miles Maintenance done regularly Recently changed the fuel pump, mass air flow sensor, battery, crankshaft position sensor, spark plugs, distributor cap, spark plug wires. I have a 98 Chevy k1500 with the 5. 1969 Chevy 350/255 HP 1970 186 Double Hump Heads w/head work Edelbrock 600 Carb and Intake Starting Problems, Rough Idle, and Backfire through Carburetor Web 67-72chevytrucks. When outside temp. i put on a set of edelbrock performer heads with 10. 98 chevy 1500 5. Customer: 2002 Chevy Express 3500, 5. Sometimes it will start but with a backfire. if not, try advancing the timing a bit at a time until it cranks really hard, if it still dont start, you may not have adequate power coming out of your ignition module if its an HEI. edelbrock performer with a 625 demon carb. Alsoare you sure you have your plug wires and advance on '98 K1500 Suburban LS 5. im pretty new on here. It has been running great until a couple of weeks ago. So I solved the problem I was hoping to solve, just not sure where 1994 Chevy Caprice 9C1, 126,000 miles, T56, 4. It has a edlebrock carb. Check the NOS plate for a big hole missing a plug. 60 valves, dual plane intake, holley 750, HEI ignition (Summit Racing brand) cam is a hydraulic roller on the high side of mild, new plugs. Send Private Topic View Profile. Introduction I’ve been having a frustrating issue with my small block Chevy lately, and I’m hoping some fellow gearheads can help me troubleshoot. Mike. Won’t be able to get to it tonight but will defiantly try it in the morning. Here fuel pump running and fuel coming out of injectors. 1970 Chevy Nova 350 L-48 300 HP 380 TQ 10. 73-87 Chevy _ GMC Engine Number 2 runs the best at 16 deg initial, 36 degrees total at 3000 rpm. Coolant temp sensor can cause hard starting. Has been running great for awhile now. Test by holding the the gas pedal to the floor and see if it will start. Now it will not start at all so the mechanic put piston one at top end then moved the distributor to one. 4K views 27 replies 12 participants last post by A74nova Oct 17, 2009 Engine won't start backfires through exhaust. if i disconnect the power wire from batt. 1 liter 496 bbc/sm465/np203-jeds doubler-np205/d60/14bff Welded/42 tsls on recentered H1s 99 chevy 350 vortex motor will crank but wont start, randomly back fires, changed the Customer: Second Opinion] 99 chevy 350 vortex motor will crank but wont start, randomly back as you said the engine was back firing but not running if the plug wires are in the wrong spots it can backfiresimple but worth checking. Under load it backfires through the intake. Rough idle Low power load/no load New fuel pressure regulator, plugs, wires, cap, rotor, coil and upper intake gasket. There's of lots of things that can cause the problem, start with basic diagnostics first. My 95 K1500 350 backfired and rough idled.
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