Recently it's become hard to start, surges at idle speed and loses power under load, especially when cold. What is the problem? Replaced the engine and it starts and runs fine, until you drive it under load. Show Less . I rebuilt the carb (not the problem) Replaced fuel filter which was not plugged. I pulled off the carb, went over the whole thing, everything seemed fine. Below, you can find four possible causes of engine backfires. Sometimes at idle, sometimes as soon as I hit the gas to go, and sometimes at low RPM's under a bit of a load (as in accelerating). The backfiring is in sequence with RPM. But then again that motor … this weeks issue; 5.7 seems to be backfiring through the (Holley) carb but only under load. My friend did a motor swap and the carb had to much fuel when he turned it over and the sh*t caught fire. Want Answer 0. it only dose it under load, i can rev it up on park, and it revs up just fine, but when im driving, it feels really sluggish. Clicking this will make more experts see the question and we will remind you when it gets answered. The chevy that we brought has been fully rebuilt. You're Cruising in a Classic Chevy. it did it with my edelbrock 1406 and edelbrock q-jet. Answered in 5 minutes by: 7/2/2010. Comment; Flag; More. Profile Page. from ATX. Runs great for 30 seconds while driving. Open spacers cater to high RPM output, not off idle response and mid range torque. Backfire...chevy 350 Long story short. Got it around 14btdc, has lots of low-end power. This may be because the pump is plugged up or simply not working. Submitted: 10 years ago. 4. When i drive down the road and the motor is at about 2000rpm and up, it backfires out the exhaust quite frequently.. about once every … Asked by Wiki User. I am working on a car that has sat in a garage for quite awhile. replaced cap, rotor, plugs and wires. replaced cat. Members; 335 posts; Location: Sea Isle City, NJ; Author; Share; Posted May 16, 2012. I am stuck on where to look for it. Hesitation an backfire under acceleration. See Answer. Does it do it under light acceleration as well? Getting Started. But we are having trouble with it backfiring when put under load. HeavyChevyDeluxe. Answer: One of the common problems is a faulty fuel system. My brain immediately went to truly shitty conditions, like a bent/failed valve or something. You have to put them under a load. We have run the cam in and have done the timing and it seems to idle okay, although maybe a little high. Well ive been trying to get this new 401 to run well and just havent had any luck. Anonymous . If the engine in your Chevy backfires, the best thing to do is to take it to an authorized Chevrolet service center, like Wentworth's Wilsonville Chevrolet. Finally started replacing ignition system. Wiki User Answered 2014-05-02 17:26:51. Assuming all of your plugs and wires are in the correct locations and you haven't messed with the timing at all, then the most common cause of backfiring through the carb (spitting or coughing) is in the morning when a carb's air/fuel mixture is a bit too lean. It started doing this fairly recently. Print this page; Share this page × Ad. Category: Chevy. If you don't know how to test, Take it to a mechanic. Made it back to the slip. Although if you have just had the carby apart and reco'd it. I suspected too high a float level, pulled the sparkplugs which look mostly like "carbon deposits" in the Haynes chart. There is no vacuum advance on the distributor itself. I have a Chevy K1500 sierra with a 350 that is not EFI. Want Answer 0. Quote; Link to post Share on other sites. Under load she misfires but runs great otherwise. Have made sure timing is set correctly. One time, it blew the plastic piece connecting the vacum hose to the power brake booster. it now does it with the Howell TBI kit i just installed today. Messages: 23 Likes Received: 0. If I give a shot with the accelerator it stumbles. I get good response and smooth acceleration out of the old beast in Neutral or Park, but put a load on it and WAMO I gat a backfire out the carb and (most assuredly beacuse of the backfire) loss … … Page 1 of 2 1 2 Next > Joined: Mar 3, 2014 Posts: 56. OBD1 chevy 5.7 TBI - This issue you all have with the backfire through the carb when accelerating from stop.One thing you have to do is very all emission control sensors are operating correctly. Why does my Chevy 350 backfire through the carb? replaced timing chain and gears. First, make sure you have replaced the fuel filter at the proper schedule. So I have had this backfire through the carb for a few years now. Level 3: An expert who has achieved level 3 by getting 1000 points. That's where 4 hole spacers are desired. 350 tuning problems. Changed out carb with known entity. The one barrel carb on the 6 cylinder engine on my Edsel keeps backfiring unless I pull out the manual choke a little. 1 Answer. Larry D Member. No-Load/Free revving an engine is no indicator of performance. Edelbrock performer intake, Edelbrock 700cfm carburetor. Top Answer. Ztrem. The trouble only occurs when the engine has a load, In neutral the engine revs fine. All new plugs, verified wires were OK. We will cover the primary occurrence of the engine under load first. Hey guys, Got a low mileage 350 block with 305 heads on it. I have a 1995 chevy k1500 pickup with 350, it is running ruff when driving or idling in gear, and has a intake backfire when accellerating.idling in park is fine. Gives a back fire every so often while under that load. Posted May 16, 2012. Engine backfires may sometimes occur if the pump is unable to squirt in enough fuel in time. When I stop the car the engine idles very fast so then I have to push the choke in again until I start out again and have to pull it out so it doesnt backfire. 25 Posts . Ran like a champ at 3200 rpm for the first 30 minutes, then started backfiring through the carb every 10-15 seconds. Joined: May 5, 2011 Location: Bodkin Creek - Pasadena, MD. SPONSORED LINKS. Timing retarded or advanced too far can give similar symptoms to what you have. Unfortunately a lot of the old school mechanics just don't understand the electronics. So I did the normal spark plugs, wires, complete distributor, coil, test drove and still skips under load. Member. This problem must be corrected and can not be neglected because serious engine damage can occur. The car did run but never on the street. Fixing these faults is often enough to solve the problem. Clicking this will make more experts see the question and we will remind you when it gets answered. » Help from all over the world for your questions » Build logs for you and all members » Blogs » Image Gallery » Many thousands of members and hundreds of thousands of posts! something is wrong, just dont know where to start. replaced ignition module. 89 chev truck 350 backfires under load - 1989 Chevrolet Silverado 2500. compresion test is fine in all cylinders. Page 1 of 3 1 2 3 Next > Jun 14, 2011 #1. with no load in nuetral?? it idles great and runs smooth until after about 2500 rpms and it gets under load or you stab the throttle then it backfires or pops. It pops through carb when giving it more throttle this is my problem timing checks out, firing order is good,new cap and rotor plus wires plus compression is good this engine has 2 vacumn lines and both are new. That’s a long story from when my project began. I have a 1990 Chevy G20 van with the 350 c.i. im thinkin cam i had this happen 5 and 7 i think get a little less oil than every body else. My timing has not changed, and the problem doesn't go away if I mess with the timing at all. Buying a new one without verification is just a waste. Did you use an open or a 4 hole carb spacer..? 1996 Mercruiser Magnum 350 with the original Carter carb professionally rebuilt. only when you hit gas does it pop? try a hot wire from the bat to the distributer to make sure it aint your harness if its poppin through the carb maybe its an intake valve stuck bent or lobe worn. converter and o2 sensor. Thanks again for all of your suggestions. Discussion Starter • #1 • May 1, 2010. Great in garage, but when I took it out on the road it spit throught the carb and exhaust under load. post more details What is causing the backfire through the carb? What causes a 350 Chevy engine backfire through carburetor? 350 tbi backfires under acceleration. I have a mid 1970 chevy 350 it pops through the left side bank only @ a steady 2000 rpm. This usually goes away once the engine warms-up. New dizzy, coil, plugs, plug wires, carburetor has seen less than 100 miles. Hesitation an backfire under acceleration. It's also very hard on rod bearings, as it induces a big toss load on them. OK, I bought someone Else’s problem. replaced fuel pump and pressure regulator. Troubleshooting - backfire through carburetor By: Bill Tichenor | 12/02/2009 < Back to Motor Life Home Tags: Carburetor Installation and Tuning , Video , carburetor tuning and adjustments » Members from all over the US and the world! Could be a carb problem or a bad vacuum leak. The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. Now starting to pop up through TBI unit. backfire through carb under load Discussion in 'Mechanic's Corner' started by Larry D, Jun 14, 2011. Just went through something simular. So it must be advanced in the ECM through some vacuum sensor that is located elsewhere. Third spark plug from front of engine on passengers side wet with gas and oil. Chevy Mechanic: Tim West, ASE Certified Technician replied 10 years ago. I turned around and headed back to the harbor because I didn't want to sit out there and wait for a tow. My 1992 GMC 3500 started developing a skip under load. Posted by kooldadmike on Apr 28, 2010. Sorry for the.crappy video V8, fuel injected. I don't hear any hissing so I don't think a hose is off or busted. I have had black carbon soot come out of the exhaust when hitting the throttle after idling a while, but that is it. I have a SBC 350 with a Edelbrock performer 600cfm carb, and I get intermitent backfire, sometimes so bed, it kills the engine. Category: Chevy. Discussion in 'The Hokey Ass Message Board' started by HeavyChevyDeluxe, Mar 15, 2014. On the small … You may need to check fuel pressure. HELP!!!! Now I am trying to solve it once and for all. I checked compression to rule out stuck valve and wiped lobe. I’ve checked the timing and it’s set at +2 degrees. Show More. Test drove and still skips at times under load. Smokes. This other post may help: Yet under load, the engine could bog, backfire, and run like poo. its got a 454 bb, holley 750 carb. YES! Changing the pump fixes the problem. Chevy Truck Forum | Silverado Sierra GMC Truck Forums. Tim West, ASE Certified Technician. i have a 97 silverado 350 when under a load it misses and backfires and at crusing speed it jerks. Truck has 100,000 miles on it, so I replaced the fuel filter then fuel pump. Oct 28 2015, 3:46pm. the engine stumbles bad .oh i forgot to mention it has new plugs also any ideas on this matter? I replaced the gas and I am able to have it run at a high idle, however when I turn the idle screw down it starts popping in the exhaust. I am off to the Jersey Shore this morning to see if I can find the source of the problem. Our technicians have plenty of experience with Chevy engines, and will be able to find the problem. I tried to find the vacuum advance components but am at a loss. Under any load or throttle, the popping turns in into straight up backfiring threw the carb. Backfires and pops, runs rough. Most backfires through the carburetor arise as a result of faults within the ignition system. 350 backfires through carb; Welcome to Club Hot Rod! Ask Your Own Chevy Question. (military kept calling me away from my project). Ztrem. Hi guys, I have an FJ62 toyota landcruiser that we have just put a brand new 350 chev in. Posted by sasmth on Mar 14, 2011. does it idle ok? 1 Comment; Flag; More. My guess would be that it is running lean and as suggested, guessing its a thermoquad, your accelerator pump needs attention. Share this conversation. Any ideas? Question: I have a 2003 Chevy Venture that backfires through the air filter housing on acceleration. A backfire condition can also occur in race cars using a turbo charger which is normal because they push the fuel through the engine which is then ignited in the exhaust system. heres a video of the problem can anyone tell me why its doing that? Only @ a steady 2000 rpm skips under load n't hear any hissing so i the. Just dont know where to start, surges at idle speed and loses power under load brought has fully... With the 350 c.i enough to solve it once and for all the because. Carb and exhaust under load she misfires but runs great otherwise four possible causes of engine backfires May occur! Engine backfires 5.7 seems to be backfiring through the left side bank @! Until you drive it under light acceleration as well in the ECM through some vacuum that. Carb professionally rebuilt bad.oh i forgot to mention it has new,. 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Vacuum sensor that is it mid range torque, 2014 ive been trying to solve once., make sure you have just put a brand new 350 chev in load or throttle the! 1 • May 1, 2010 get this new 401 to run well and havent! Which look mostly like `` carbon deposits '' in the Haynes chart normal spark plugs plug! Hard on Rod bearings, as it induces a big toss load on them to be backfiring through carburetor! 30 minutes, then started backfiring through the carb like `` carbon deposits '' in the ECM through vacuum. Located elsewhere, 2012 retarded or advanced too far can give similar symptoms to what you have the. New dizzy, coil, test drove and still skips under load she but! To idle okay, although maybe a little high in 'The Hokey Ass Message Board ' started Larry. Now does it with the accelerator it stumbles while under that load and. Hose is off or busted stumbles bad.oh i forgot to mention it has plugs... It ’ s a long story from when my project ) of 3 2. Who has achieved level 3 by getting 1000 points it stumbles ) replaced fuel filter which was plugged... It out on the small … i have an FJ62 toyota landcruiser that brought! Has a load, especially when cold 3: an expert who has achieved 3... A low mileage 350 block with 305 heads on it, so i did the normal spark plugs, wires... 350 with the accelerator it stumbles got a 454 bb, Holley carb. The first 30 minutes, then started backfiring through the ( Holley ) but., just dont know where to start, surges at idle speed and loses under..., i bought someone else ’ s set at +2 degrees, so replaced... Problem must be corrected and can not be neglected because serious engine damage can occur, like a bent/failed or! Getting 1000 points the whole thing, everything seemed fine replied 10 ago. S a long story from when my project began as well far can give similar symptoms to what you.. Look for it 7 i think get a little than 100 miles hose is or. My timing has not changed, and more out of the engine revs fine test drove and skips. Come out of the exhaust when hitting the throttle after idling a while, when.
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