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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 10-25-2007, 09:45 AM   #11
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I did the wiggle test on everything I could find on the car. Idle never changed. I did find I have somehow inadvertantly left the ICM wiring sitting on the exhaust manifold. Yes! Possible problem. Nope, somehow the wiring and insulation is clean and not melted. Pulled the IAC, TPS, MAF, and MAP connectors off when running and plugged them back in. No change in idle. Hmm, I always thought the car should stall when the MAF is unplugged. Ohh well.

Plus I can't believe I didn't mention this in the original post.

After getting the car running back again after the LIM/UIM job it had driveability issues. At constant light throttle the car would sometimes surge for a very brief moment. Plus if the car was decellearting to come to a turn or stop and then lightly applying the throttle would stall out the car. Start right back up though. I'm not 100% but I remember the car would only do this when cold. Coolant got as far back as the rubber intake tubing. So I just figured the MAF needed cleaning.

Cleaned it and voila it didn't stall when warming up anymore. But 100 miles later and I'm at my current problem. A stall event followed by a no start, and then after cooling it starts.

The right thing to do after I clean all these grounds is probe into the CPS, the cam, a fuel injector harness, and other sensors and drive around with an o-scope. Plus should get a fuel pressure gauge as well. That way under the next failure event I can get some insight.
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Old 10-28-2007, 01:55 PM   #12
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Despite a rainy Saturday I put some time in on the Olds.

Cleaned a bunch of stuff, found a bunch of potential problem areas, and replaced the CPS.

* Cleaned the battery cables, battery terminals, and the three fender mounted grounds. A wire wheel on a air powered die grinder makes very quick work of cleaning work. Heh. All were pretty clean but did this regardless.
* Reset and cleaned the electrical harness on the ICM, MAF, MAP, TPS, IAC, Injectors,and IAT.
* Checked for vacuum leaks with propane.
* Changed the CPS.

Also found the following problems.

* Loose ground nut/stud underneath the ICM from failure to tighten upon LIM/UIM replacement. Ground wire was still tight on the stud though.
* ICM harness on Cylinder #1 exhaust manifold. Insulation didn't melt just yet.
* TB was looser then I would have liked. Torque'd it down.

Replacing the CPS was easy as pie. Except for that pulley. I had to make some M6 hardware to properly pull it and pulled some of the threads out while trying.

Hoping this is it. GF had me a bit nervous as it was spewing condensation out the back for a while and mistaked it for coolant again. A nice 35 mile trip today got it all cleaned up.

Thanks All.
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Old 10-28-2007, 08:01 PM   #13
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Default cps

You may have solve it. let us know how it goes.
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