1992 bonneville back firing through intake..........help me - 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 02-23-2009, 06:16 PM   #1
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Unhappy 1992 bonneville back firing through intake..........help me

I had a new icm put in my vehicle and since then i been getting backing through tha intake..
i took it to tha shop and they replaced tha fpr,and tha tps...also they installed new wires and coil...i still have tha same problem somebody pleas help
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Old 02-23-2009, 06:48 PM   #2
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Did you check to make sure all the wires are connected to the correct plug?
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Old 02-23-2009, 10:09 PM   #3
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yes i did
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Old 02-23-2009, 10:18 PM   #4
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If the problem started after changing the ICM, then the first thing I would do is put the ICM back on and see if it corrects the problem. If you don't have the old one, then try a different one.
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Old 02-24-2009, 02:43 PM   #5
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Okay tried it......it idles fine just sputters and backfires when i accelerate
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Old 02-24-2009, 03:10 PM   #6
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I'm going to contact Billboost and see i fhe has any thoughts on this.
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Old 02-24-2009, 09:49 PM   #7
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My first thought is ecm. When they go, they may never give you any info as to what'* going on...only drive you nuts.

Dan mentioned in a pm he'* thinking timing chain even though it'* super remote. GM gave us so much meat on the gears and chain that yeah it'* possible but really remote like Dan mentioned. If you search for that, you'll probably find quite a few that thought they had that issue and it ended up being something else.

I'd probably aim for ecm at this point. But that'* an off the hip reaction to what I've read. It'* not founded on any info, just gut feeling.
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Old 02-24-2009, 10:06 PM   #8
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Moved to 92-99 section

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