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2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-22-2007, 02:42 PM   #51
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I need to tune then...BAD.



Also, I never get KR when I have misfires, but I still get misfires, but ONLY when idling or after startup. You cannot feel them. The car idles perfectly quiet and smooth. So I don't think my KR is caused by misfires. At WOT I never have misfires. My data rate is up to full speed FWIW.

Does anyone generally know why a car can misfire ONLY at idle? Or is that too ambiguous of a question?
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Old 10-23-2007, 10:54 AM   #52
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Bump.

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Originally Posted by bonnie94ssei
Does anyone generally know why a car can misfire ONLY at idle? Or is that too ambiguous of a question?
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Old 10-23-2007, 11:34 AM   #53
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Quote:
Originally Posted by bonnie94ssei
Bump.

Quote:
Originally Posted by bonnie94ssei
Does anyone generally know why a car can misfire ONLY at idle? Or is that too ambiguous of a question?
Got me.... I'd say a bad plug but you've done that... Maybe you answered this earlier but did you get it to move to a different cylinder?
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Old 10-23-2007, 01:13 PM   #54
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I misfire on all cylinders (not all at the same time, but two cylinders at once has happened). Sometimes I even see the number '16' pop up next to a cylinder and disappear 3 seconds later. If I had 16 misfires I would think I'd feel it, but apparently if this gauge is accurate, it'* possible.
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Old 10-23-2007, 01:21 PM   #55
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Have you drained you PCM yet?
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Old 10-23-2007, 02:25 PM   #56
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What do you mean "drained?"
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Old 10-23-2007, 02:38 PM   #57
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Disconnect the battery for an hour.
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Old 10-23-2007, 03:16 PM   #58
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When I did my LIMs a couple weeks ago. It was disconnected for several hours. I had misfires long before then though. I'm tempted to get a new ICM. But since the misfires don't seem to be the cause of my KR, I should focus on tuning first.
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Old 10-23-2007, 03:45 PM   #59
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could that engine be dirty maybe a seafoam or Gm top clean could help
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Old 10-23-2007, 04:43 PM   #60
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I did the seafoam when I did my LIMs. And the engine is very clean inside. Oil comes out golden brown after 3000 miles. I don't know exactly how much buildup is on the PISTONS, but the whole top end is beautiful from what I saw when I tore into it.

http://www.bonnevilleclub.com/forum/...highlight=lims

As far as KR goes, I don't think it has to do with being dirty or needing a tune-up. It has to be fuel related to some extent. As far as misfires go, IDK yet. I haven't tested my coils. Maybe I'll swap on a known good ICM before buying a new one @ $200.

I suppose a compression test would be a good idea too, though I don't think my misfires are happening due to loss of compression.
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