Backfiring - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-04-2007, 10:07 PM   #21
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What octane fuel are you running?
I'm putting premium in it. The only time I ever put regular in was with octane booster and that was more than a year ago.

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Do you hear any exhaust leaks?
It shouldn't have any exhaust leaks. The engine mount on the driver'* side front of the vehicle was just replaced along with the rear exhaust manifold. It sounds much quieter now. The problem has shown itself before and after that was fixed though. If you'd like, I could take a video of it running if you want to listen.



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Does it seems that your catalytic converter may be restricive and plugged up?
What could I do to know? As far as power: The car seems normal until it gets into the boost. The boost used to have a lot more power than it does currently.


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Did you ever clean up the battery cables, in particular pulling the boot off from the positive one?
I just did it.... Removed the bolts from the boots and cleaned it. There was a little corrosion, but it didn't seem to help the problem.
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Old 06-04-2007, 02:11 PM   #22
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so i looked at this on vacation, i told jonathan93 that his videos are misleading, it really feals like he has a miss under high throttle. i sat in the car and watched the scantool as he drove, this issue is not being caused by knock retard and i could not find anything mysterious that might be causing it, but i am almost positive this is a miss.
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Old 06-04-2007, 02:50 PM   #23
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Ok.. a miss at high throttle..

How did the O2'* look? Maybe a bad injector and the others are compensating?
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Old 06-05-2007, 12:16 PM   #24
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ok, so i sat in with jonathan again.... light throttle or at idle the O2 was at 700ish and under high throttle where the miss is occuring at, its at 900ish (i didnt see any sudden jump or drop in number when it missed), under mid throttle its at 900ish.
i dunno what is normal but this is my findings for o2 readings
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