low-load stumbling - 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 01-13-2004, 09:45 PM   #11
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I found a ICM and coil pack set on ebay. I'll swap 'em in and see if the symptom changes. Otherwise, I'll look real close for vacuum leaks before I go for a PCM swap.
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Old 01-31-2004, 01:30 PM   #12
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Swapped in a ICM and coil packs. Still have the same problem. It might have gotten better on the highway cruising but it is still very noticable in the 1000-2000 rpm range with light throttle. What next? It seems to be worse when it warms up. Could it be a temp sensor?
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Old 01-31-2004, 08:45 PM   #13
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Are any of your plug wires touching each other or touching metal? My wires went bad because of that and caused the same problem you are talking about. When its dark out start the car open the hood and rev it up a bit see if you see any sparks coming out of your wires. This is the second time I had that problem and it was due to a bad spark both times. I know your wires are fairly new but they can still good bad quickly.
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Old 02-10-2004, 05:44 PM   #14
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The SES light finally started coming on intermittently and the stumbling had gotten worse. As I have yet to obtain a reasonably priced scan tool, I took it into a mechanic I know and they scanned it, found an error code that indicated an EGR valve malfunction, took the valve off, cleaned it, put it back together and now it runs GREAT! Just charged me $69 for the diagnostic.
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Old 02-10-2004, 06:50 PM   #15
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EGR... We'll have to remember that one.
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Old 02-11-2004, 10:32 AM   #16
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I shouldve known that one, my saturn had the same problem, but I got cheap and just unplugged the vacuum from it
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Old 02-11-2004, 02:14 PM   #17
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Crap. That didn't even cross my mind. And it should have. Shame on us, Fuddy.
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