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12-03-2009, 12:29 PM | #1 |
Registered User
Join Date: Jul 2004
Location: columbia sc
Posts: 387
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Need help with exhaust backfire
When i crank the blazer it runs fine but whan i try to drive it and accelerate it backfires out of the exhaust. I am not sure if it is doing it out of both sides of the exhaust. I understand that usually exhaust backfires mean too much fuel is being delivered and it is igniting in in the exhaust. Can anyone tell me what to adjust on the carb, is it the screws or the return spring. Could this be caused by anything else?
Thanks, chris
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YELLOWBLAZER1969 |
12-03-2009, 01:34 PM | #2 |
Registered User
Join Date: Sep 2009
Location: CA
Posts: 29
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Re: Need help with exhaust backfire
HAVE YOU CHECK YOUR TIMING SPARK PLUG GAP AND CONDITION INCLUDING CABLES CAP AND ROTOR TOO VACCUM LEAKS OR THE VACCAUM ADVANCE
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SAL |
12-03-2009, 02:58 PM | #3 | |
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Join Date: Jul 2004
Location: columbia sc
Posts: 387
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Re: Need help with exhaust backfire
Quote:
thanks, chris
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YELLOWBLAZER1969 |
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12-03-2009, 03:32 PM | #4 |
Registered User
Join Date: Jan 2007
Location: Columbus, Ohio
Posts: 4,339
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Re: Need help with exhaust backfire
In my case it was an exhaust leak at the manifold/exhaust tube that caused the backfire.
Upon rapid acceleration and then taking my foot off the gas would lead to a nasty backfire and if I let my foot off the gas slowly - it would be less likely to occur. I ended up replacing my manifolds and the entire exhaust - but the leak I had that caused the backfire was between the manifold and the exhaust tube(s). Good Luck! |
12-04-2009, 04:34 AM | #5 |
70 Chevrolet=Obsession
Join Date: Jun 2009
Location: nice ca
Posts: 1,067
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Re: Need help with exhaust backfire
This may not be it but a bad coil can cause backfiring.
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I'm Just like my truck. Old, Ugly and Grouchy. Except my truck starts easily in the morning and doesn't smoke! IT'S NOT EASY BEING GREEN! -Kermit the frog 1970 Chevrolet C-10 Longbed Stepside : 350, Muncie M20, 3.08 GM corp. positraction Forest green exterior/light green interior(Where all my money goes) 1996 Toyota Corolla (Parts runner) |
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