What do I do with Dad's old car? 1992 Park Ave Supercharged - 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 12-03-2006, 02:27 PM   #11
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Default Re: Letting my Ignorance shine, where is the ICM?

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Thanks for the tips, I'll check the gounds and connections before I replace sensors. Can some one point me to the ICM?
Yup. See those coil packs? Right under them is the ICM. There is a long, flat connector at the front of it...thats one of the spots to look at for bare or shorted wires. The mounting bracket for it is where the negative battery cable goes to, along with several smaller wires that are sensor grounds. Also, the ICM itself is grounded on that bracket, and lots of debris and corrosion happens between those 2 items.
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Old 12-06-2006, 02:36 PM   #12
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Default GETTING BETTER!

Thanks for the lead to the ICM and Coil overs!

I pulled out the ICM and coil overs last night and they were badly gunked up. I cleaned them and when I started the car this morning it was much easier to crank and noticably better, but the problem is still there. I wonder if I didn't clean the parts thoroughly enough or if I just need new coil overs or an ICM.

The car still throws code 18 cam/crank circuit error and the idle is still erratic. Sometimes it jumps around 3-400 rpm with no change to the engine, so there is obviously still an electrical issue somewhere.

Should I start replacing these parts? Or check more connections? Maybe the PCM? WHere is that located btw?

Thanks for the help!!!
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Old 12-06-2006, 02:42 PM   #13
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ok lets not shotgunning parts.....

lets get that Cam/Crank Sensor fixed first and then see if that helps the problem
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Old 12-06-2006, 02:51 PM   #14
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I'd rather not pull apart the front of the engine to get to the cam sensor. I did pull off the wire harness and clean it last night.

Is it correct that if the magnet was bad, it would only start 1 out of every 6 times? It starts every time now.

Where is the Crank sensor? I guess I could just follow the wires from the ICM and find...

Thanks!
-Andrew
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Old 12-06-2006, 04:13 PM   #15
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Lets get this right... You need the right info...

If the cam sensor is bad the PCM will start correctly 1 out of 6 times, meaning it will start with the correct fuel timming... The cam sensor is used as a cylinder #1 TDC reference pulse... The PCM uses the cran sensor for the rest... I feel that you have one of 3 things happening here... The cam sensor is having issues, the crank sensor is having issues or the ICM is not happy..

I believe the code 18 usually results in a new crank sensor, but a time or 2 we have seen where the Cam sensor was the issues...

I think it will take more research, but there are a few that have hit this issue head on..

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Old 12-06-2006, 06:07 PM   #16
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Have you checked over the grounds just in case? Though it *probably* isn't what is causing your issue, I would definately exhaust all "free" fixes before tearing into those sensors. I'm with jr's3800...cam sensor rarely if ever goes bad...concentrate on the crank sensor. Now, sometimes the crank sensor will get road gunk in it, causing false or misinterpreted readings. Find you some brake cleaner and blast that sensor and see what happens after that.
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Old 12-07-2006, 12:30 AM   #17
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To spare me the time searching, how do I reach the Crank Sensor? I'd put my money on this being the problem.

Cleaning the ICM and coil overs has helped the cold start with occasional stall problem. I know believe this was a separte issue to the jumpy idle. I'll clean the crank sensor tomorrow and see what happens.

Thanks gents.
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Old 12-07-2006, 07:10 AM   #18
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Quote:
Originally Posted by Supercharged!
To spare me the time searching, how do I reach the Crank Sensor? I'd put my money on this being the problem.

Cleaning the ICM and coil overs has helped the cold start with occasional stall problem. I know believe this was a separte issue to the jumpy idle. I'll clean the crank sensor tomorrow and see what happens.

Thanks gents.
Crank sensor is by the harmonic balancer. If looking at the front of the engine (which means standing from the passenger side where all the belts are), it will be to your right of the balancer. It will be covered somewhat by a black plastic ring that goes around the balancer. You will need a push tube inserted in the brake cleaner head to really get to the sensor.

Should you have to replace the sensor, you will need to pull the balancer off. You will need a 23 or 24 mil. socket, an impact gun, and a puller.
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Old 12-08-2006, 01:05 AM   #19
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Default Crank sensor is loose

Well, I think I found my problem. The crank sensor is not seated and is easily jiggled with a finger. I'm guessing that would be a likely cause to the "Crank/Cam Circuit Error". Thanks to everyone for the help.

This weekend I plan to replace it and fingers crossed it'll be smooth sailing again.
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Old 12-08-2006, 02:05 PM   #20
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Good Luck and let us know what happens

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