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What causes a sneezing or backfire noise from engine block and up through air filter of rebuilt Chevy 350 engine with new heads and cam and headers when car is started cold and gas is pressed?
Wiki User
∙ 15y ago
You may have either a timing problem or the firing order is not right. With the engine on top dead center and the timing mark on zero, the rotor should be pointed at the number one electrode on the dist. The firing order is 1 8 4 3 6 5 7 2 . It turns clockwise. Check that first to see if you have a wire wrong. If that's not the problem, check the timing with a timing light. If it still backfires, you've probably got a valve not seating properly, or worse, the cam is not timed with the crank just right.
Wiki User
∙ 15y ago
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I have a 1970 vw bus and i am getting a lot of backfire . i had the carborator rebuilt but i still have the problem of it backfiring.?
after rebuiling carb jet have 2 b adjusted, check ur timing also If you have any exhaust leaks close to the engine it will promote backfires.
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I have a dunebuggy That has a 78 Toyota Corolla 1166cc 4 banger engine in it the 2 barrel carburetor i just rebuilt it and it will fire and run but then it will backfire and spit fuel out of the top?
Burned valve, Check the compression. Also check the timing sounds like it is firing to late..
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