94-L27.....Unstableness at 39-51mph -- ICM? - 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 05-20-2005, 03:44 PM   #11
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Originally Posted by jr's3800
If the ICM is starting to fail in a bad way you may see the tach drop off for a split second at a time, almost as the car has stalled for a split second and them come back to life... Other times you may get an intermintent nasty stumble.... A not so happy coil can also cause a very nasty stumble...

Would you happen to have another ICM with coils still attached handy as a test?
I just checked ou the coils after the car has been running for 1/2 hour.

coil 1 (6,3) - 5,983 ohms
coil 2 (2,5) - 5,995 ohms
coil 3 (4,1) - 5,910 ohms

So the bottom is off by tad compared to the other 2. not sure if this is a big enough difference though

will that actron CP9110 or whatever scan this car with the right adapter cable and give me the information I need?
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Old 05-20-2005, 04:49 PM   #12
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The scantool will give you data on the TCC slip RPM'*, as well as the TCC Apply percentage... and what gear is called for...

And being the hybrid OBD and a half junk, you also have the Missfire data as well...

weather or not that will aid you in finding the real problem may be another story...

If my friend had a 3800 Module I'd send it to you... Not enought 3800'* blow up for me to strip modules off of... We have seen 1 LN3, 1 L27, and 2 L36'* blow up... Been a while tho...

Hard to say what may be wrong without being there to experience the problem..

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