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Author Topic: Exhaust Backfire  (Read 1982 times)

Offline 1986GMCSierra

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Exhaust Backfire
« on: February 26, 2015, 10:36:39 pm »
I have a 1986 305 GMC C1500 i have the rochester 4bbl carb and i have a backfire problem..... for now the exhaust is set up like.. stock headers to catylitic converter to pipe then out, so pretty much straight piped..... i took it all apart and ensured there are no leaks... i cant seem to track down the backfire problem.. the idle is also higher than normal but that is juat my judgement by sound because i dont have a tachometer...
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Offline rich weyand

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Re: Exhaust Backfire
« Reply #1 on: February 26, 2015, 11:28:29 pm »
I take it you mean after-fire -- out the exhaust -- and not backfire -- back through the carburetor.

I got afterfires and loss of power in my truck when the distributor, which had not been properly clamped down, moved retarded.  I checked, and I was at 4* AFTER top dead center.
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Rich

"Working Girl": 1978 K-10 RCSB 350/TH350/NP203 +2/+3 Tuff Country lift

Offline 1986GMCSierra

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Re: Exhaust Backfire
« Reply #2 on: February 28, 2015, 07:38:42 pm »
Quote from: rich weyand on February 26, 2015, 11:28:29 pm
I take it you mean after-fire -- out the exhaust -- and not backfire -- back through the carburetor.

I got afterfires and loss of power in my truck when the distributor, which had not been properly clamped down, moved retarded.  I checked, and I was at 4* AFTER top dead center.
yes i mean afterfires.... i will take a closer look
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