LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Back firing!?!?!?!

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Old 02-01-2006, 08:29 PM
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Back firing!?!?!?!

My car back fires violently when you dive after starting it up... before the 02's are actived by the PCM, and I'm guessing it's running rich... for this to happen.... Gas consumption is down the drain.

I replaced the MAP sensor.. and now my busted IAC is showing it'self since the car wont idle under 1500 not sure why that happend... after I replaced the stock GM unit... since it idle at 1200with the broken IAC still.


I'm at my wits end, and still the car seems to be flattening out on the accelorator at higher RPMs... my exahust tips are super black from this after I polished the hell out of them, which is unusual.. something is up.

Last edited by Heatmaker; 02-01-2006 at 08:36 PM.
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Old 02-01-2006, 08:42 PM
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Re: Back firing!?!?!?!

When was the last time you checked your cotton filter?
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Old 02-02-2006, 09:18 AM
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Re: Back firing!?!?!?!

'whats a cotton filter?
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