Most engines have one or two of these valves one for each exhaust manifold. It starts just fine but at an idle but smells like it is running way rich and when you rev to about 1700+ it starts to make popping sounds in the exhaust but stops when you bring it back to an idle. Thnx . all brand new wires, coil, dist. April 1, 2019. Hope somebody can help!Just rebuilt a 1972 chevy 350 with a new crankshaft,edelbrock torquer plus cam,torker manifold,holley carb, summit 1.6 ratio rocker arms,HEI distributor.This motor is in a 1979 nova and ran well before.Now when trying to start it backfires through the carb something terrible.Have tried readjusting the Check out the video on how to fix and engine backfire. Try to give it fuel and it backfires through the exhaust with a series of small bangs and then flames and a bellow of smoke. The backfire is clearly in the exhaust, on the passenger side and not out the carb. If you don't know how to test, Take it to a mechanic. Chevy 350 is backfiring/misfiring through the exhaust? I have a mid 1970 chevy 350 it pops through the left side bank only @ a steady 2000 rpm. got an SBC 350. speed demon 650 carb. Buying a new one without verification is just a waste. Look for a plug wire acring out to ground. it pops out the exhaust throughout the rpm range. 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.Our technicians have plenty of experience with Chevy engines, and will be able to find the problem. I have a 75 350 chevy engine that is backfiring through the exhaust, I just started the car after sitting for 1 1/2 yrs. (Backfire is the same side as exhaust leak) It wasnt backfiring before today so im not sure if its the already existing exhaust leak. A backfiring engine can be alarming--and it can signal that something is wrong with the vehicle. 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. Hello, my 1978 Chevy C10 is my daily driver to high school and it has a Chevy 350 5.7l is a pretty bare block with little electronics but it has headers and an Edelbrock intake and carb and a Delco HEI Distributor. To check these valves you must remove them and then try to blow through them each way. At 2000 steady its gone for instance and on up its pretty good yet backing off at all from 2500 - 3000 it can backfire. Re: SBC 350 Engine Backfire Through Exhaust and Carb I had the same back fireing issue under acceleration from the carb and it turned out that the cam was beating up 1 lifter and eventually made a small hole in the lifter. Only one direction is all that should be allowed. Check inside the cap, … Assuming you have a backfire out the exhaust. its timed correctly. Mo internal engine noise, idles fine for about a minute and then just dies. Was it HEI before? Look for cracked insulators around the electrode on the threaded end. Its intermittent at idle and sometimes up to 1500 light load. What brand is the new one? Please help. 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. Regards, Brad ... 1970 Chevy Nova 350 L-48 300 HP 380 TQ 10.25:1 CR 4 bolt main Chris Maraccini Keyes CA:usarmy: Save Share. Check plugs again. Anyone know whats going on? backfire through exhaust chevy 350? If air is allowed in both directions the valve is bad and should be replaced.
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