Backfiring
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Backfiring
I have an 87 with a brand new 300 crate motor. Everything runs great but
i can't seem to figure out why it backfires when your crusing at 55-65 and just let off the gas all at once. I Just replaced the exhaust system from the cat back I put a 3" pipe with just a glasspack. I was wondering if could be not putting enough back pressure on the engine. Any help would be greatly appreciated.
i can't seem to figure out why it backfires when your crusing at 55-65 and just let off the gas all at once. I Just replaced the exhaust system from the cat back I put a 3" pipe with just a glasspack. I was wondering if could be not putting enough back pressure on the engine. Any help would be greatly appreciated.
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I Just replaced the exhaust system from the cat back I put a 3" pipe with just a glasspack.
Also check that you exhaust is tight from the engine back to the muffler, for if you are sucking in air thru a gap, it will cause it to backfire from the fresh air being introduced into the exhaust mixture.
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Originally Posted by ridgerider3
Sounds like you are running a bit to lean. This commonly happens when a free flowing exhaust is installed. If you are running a 2 or 4 bbl carb, step up the jets a couple of numbers. You can also advance the timing a degree or two, not much though.
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