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

got backfire?

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Old 11-10-2007, 07:55 PM
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on the freeway today i did a pull 1-4 and when i got to 4th i nailed it and the engine went to idle as i was gassing it. backed off the gas and went back on and BOOM! sounded like a 50 caliber shooting off.

i thought i made my opti explode at first

god, i need a tune
Old 11-10-2007, 08:04 PM
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for some reason the last couple times i've gotten on my car and its tuned when i let off it shoots flames from the side pipes and sounds like a shot gun.. lol oh well i have a **** load of miles and that motor needs to just blow already lol..
Old 11-10-2007, 09:52 PM
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mine did that replaced opti and it never did it again.
Old 11-11-2007, 09:47 PM
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nah, i think it was a little condensation buildup in the opti. it was really cool out during the day.

5000 miles on the opti and no beating on it. i wouldnt think it would go out just like that.

actually after i heard that, i heard what sounded like gravel hitting the underside of the car.

Last edited by Revelation Z28; 11-11-2007 at 09:52 PM.
Old 11-11-2007, 10:39 PM
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Buddies 01 SS does this sometimes. If he lets off at like 100 it will send fire out the back. I think he has some major exhaust leaks somewhere.
Old 11-12-2007, 01:29 AM
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at least he has coils.

the only exhaust leak i think i would have is at my Y pipe to catback connection, but that wouldnt hurt anything. i need a tune still.
Old 11-12-2007, 03:14 AM
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My car does that anytime I get over like 3K. Really annoying.
Old 11-12-2007, 07:04 AM
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i think it may be because i dont have an LT4 KM, i set off the knock sensors and it pulled timing and dumped fuel.
Old 11-12-2007, 04:14 PM
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Mine would do that a little before my first tune, and then again later on when the opti was going.



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