back firing
04-16-04, 10:01 PM
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back firing
Hey guys I have a first gen. this ? is for a buddy of mine who has a second gen and hes back firing he doesnt have a cat. and the motor has about 17,000 miles on it. does anybody know what is making the car back fire ? (Im sure you do) thanks guys
04-16-04, 11:19 PM
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the purpose of a cat is to burn off any unburnt fuel that remains in the exhaust. Without it, the unburt fuel vapor doesnt burn off clean like it should with a cat, but in the form of a nice fireball 
04-17-04, 12:14 AM
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yea when i was running mine down the highway with open headers....it backfired a lot...now with everything back on....it just pops
but when it backfires....it shoots 2 little fireballs
but when it backfires....it shoots 2 little fireballs
04-17-04, 03:32 AM
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Afterburn, as is the proper term for the effect you are noticing, is common on "unplugged" '7s and even some with high flow cats, although the quality with a cat is not as nice since the cat is actively combating it as much as possible. I know. I had cats. Had, because as soon as I take my baby back on the road, after emissions testing, they are coming off.
However, if its grossly excessive you may be running too rich.
However, if its grossly excessive you may be running too rich.
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