LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Backfiring? and i know it is not my optispark

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Old 08-29-2008, 04:58 PM
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do you have a loose ground?
what you need is a wiring diagram.
check out all those things and see if theyre linked some how in the wiring.
if so, there you go. but that sounds like an opti problem
Old 08-30-2008, 01:37 PM
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the first code said something about a ground so im really starting to think it is that, im positive it isnt my optispark. go figure too, labor day weekend so now i have to wait even longer for the car haha
Old 09-03-2008, 01:19 PM
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if i had to take a stab a this on i would say that it is the injectors on the two cylinders. if the computer tells you which cylinders are miss firing switch them up with another.
Old 07-08-2023, 05:52 PM
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Default Causes for backfire

Originally Posted by IronOutlaw
Does it run bad as soon as you crank it up or after it runs for a while? We need a little more info on what its doing. If it started doing it all at once i believe it would be something electrical and not in the engine like a worn cam (hopefully). Bad oxygen sensors or a bad maf will make a car run very rich and backfire a lot, but the cars computer doesnt use readings from them for the first few minutes of running.
Hi I think there are about 8 or 9 different reasons for it to back fire. Plugs and wires,mass air flow sensor, O2 SENSOR,To rich or to lean. Wore out cam. And of course it always runs better for a women to be under the hood! ( Just kidding y'all, Men can be great as well.



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