Calling all engine gurus-Help w/rough idle, misfire, knock - Page 2 - 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 11-22-2005, 02:56 PM   #11
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How about the ICM?
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Old 11-22-2005, 03:00 PM   #12
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I'm hoping to swap one with a friend who has a 99 GS and see if that makes a difference.

I guess I don't understand misfiring and knocking enough to understand what would be causing so much KR, so many misfires, yet the PCM isn't storing any codes, yet the car is acting funny...

Are any other ICMs compatible other then ones from 3.8s?
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Old 11-22-2005, 03:07 PM   #13
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If it'* running that poorly and you're not getting any codes, it almost makes me think the PCM could be to blame.
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Old 11-22-2005, 03:09 PM   #14
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if the plugs and the wires have been replaced, and still a misfire look at the ICM or the coil packs
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Old 11-22-2005, 03:11 PM   #15
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Don't take this as insult, but have you verified that your plug wires are connected properly? Makes me wonder if you have one crossed.
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Old 11-22-2005, 03:14 PM   #16
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Quote:
Originally Posted by vital49
Don't take this as insult, but have you verified that your plug wires are connected properly? Makes me wonder if you have one crossed.
Anyone know where that picture Nate drew is? We should provide that to help out.
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Old 11-22-2005, 03:22 PM   #17
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Replaced Coil Packs

Practically whenever I am accelerating, I'm getting at least 5' KR, it does frequently hit 9'

These are scans from my morning and afternoon drives to and from work, about 20 miles

Cyl 1 Cyl 2 Cyl 3 Cyl 4 Cyl 5 Cyl 6

530 226 1339 401 68 631
180 0 192 214 0 60
296 27 726 193 90 59
191 0 373 204 91 108

Injectors Swapped

5 6 4 1 3 2

357 102 514 82 0 789
195 6 302 128 59 0

Coil Pack 3/6 Swapped w/ old 1/4 Coil Pack

506 87 543 289 16 102
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Old 11-22-2005, 03:23 PM   #18
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And I'm not offended, I'm greatful for the help!

I don't think I have my wires wrong:

Engine:

Back
2--4--6

1--3--5
Front

Coil Packs:
3/6
2/5
1/4
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Old 11-22-2005, 05:12 PM   #19
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I had a similar problem with my '96 Bonneville SE. Intermittant stalling, surging and sometimes hardstarts but no engine codes!! .

Finally I check my fuel presure regulator by looking at the vacuum line attached to it and saw fuel leaking. Check your Fuel pressure reg. It'* easy and the part is only about $50.
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Old 11-22-2005, 06:09 PM   #20
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Maybe its not electrical.
could be a dirty maf, IAC, or vacume leak. did you put your O-ring on the PCV?
Water in the fuel was my culprit on the 96 when it wouldn't idle.
Added isopropal gas dryer and it was fixed in 5 min.
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