92 SSEI runs rough - 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 08-08-2009, 02:21 PM   #11
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Well, I see that yours is a 92. There would be some differences to consider but that should become obivious.
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Old 08-08-2009, 05:02 PM   #12
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Yeah mine is 92 not sure how different the 95 is.

My rough idle is at a lower RPM - usually around 850 and it will dip to 700-650 and quickly jump back up. It does this when its at operating temp. It tends to be more severe I noticed when braking to a stop and idling.

I have another symptom that may or may not be related. When driving in overdrive (45+) it seems to lack some power. For example when driving up a hill, giving a little bit of acceleration will cause the engine to "chug". If I stomp on the gas it revs up good and the problem is gone (I guess it switches out of overdrive).
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Old 08-08-2009, 05:47 PM   #13
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Take a look at my last post "Spark plug tip is bent". My last post in the thread. It may not be the problem that you are having but it was the fix for mine.
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Old 08-27-2009, 10:05 AM   #14
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So I'm still having this problem. At this point I'm thinking that I'll just start replacing possible bad parts.
In no particular order:
Coils
MAF
EGR
IAC

Thoughts?
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Old 08-27-2009, 11:13 PM   #15
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OK scratch coils off the list - put 3 new ones in today, still idles like ****.

Quick question, is there any reason a bad coupler would cause a rough idle?

I really want to get this thing fixed, im ready to start dropping brand new parts in...

edit to add: When the car was warm and I unplugged the MAF when idling - the car completely died. Is this normal or should the car continue to run?

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Old 08-28-2009, 01:08 AM   #16
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I am pretty sure that is normal. As for the coupler, that should not cause it to idle rough. A bad supercharger gasket could. Have you checked for cracks in the EGR tubes?
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Old 08-28-2009, 11:19 AM   #17
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No cracks in the EGR tube. Bad supercharger gasket, yeah that might be something. I'll spray around the base of the supercharger real good see if I can find any vacuum issues there.
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Old 08-30-2009, 03:37 PM   #18
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I sprayed all around the supercharger and didn't notice any change in RPM. I think I'm going to go ahead with the SC coupler change and just replace all the gaskets/vacuum hoses as I go. This way I can know for sure.
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Old 08-31-2009, 01:16 PM   #19
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You might want to go ahead and change the Lower Intake Manifold gasket while you are in there. It is only one more step. I did mine about a month ago and it was easier than I expected. You on the right side of the picture that it was time.

Be sure to get the Aluminum gasket set. Also, make sure you put all of the intake manifold bolts back in the holes that they came out of and torque to the correct specifications.

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Old 08-31-2009, 06:40 PM   #20
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This might be a noob question but once I get the SC off what do i need to do to get the LIM gasket?
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