Trying to help someone with a '94 Park Ave... - Page 4 - 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 05-09-2007, 05:55 PM   #31
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94 and 95 H-body computers do not have a good track record. Mine failed by unexplained stalling that increased in frequency until it could no longer be overlooked. I bought a junkyard PCM for my '95 $35. It fixed the problem but only lasted about 6 months. I tried two cheapo reconditioned PCMs from O'Reilly for about $40/ea. Both set multiple false codes and never functioned properly. Then I bought a PCM reconditioned by Cardone for about $100. That one was good from the plug in and is now about a year old.

Another thing to consider when several electrical systems go haywire at once is loose or faulty grounds. You need a FSM or a good wiring diagram to show you where they are. Some grounds serve many circuits and can cause very strange symptoms when they fail. When you restore the good ground, all is fixed at once.

Before replacing the PCM, for example, check the ground connection for it near the oil filter to make sure it is clean, sound, and tight. Also, if you haven't already done so, check the ground buses under the kickplates.
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Old 05-09-2007, 07:45 PM   #32
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Alright, I just checked both busses and they are def. not the cause. They look as good as they day they were installed. I looked at grounds and they appear to be ok but I didn't reference the manual yet so I'll do that later tonight.
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Old 05-09-2007, 07:53 PM   #33
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Let us know what you find...

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Old 05-09-2007, 09:28 PM   #34
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OK, no luck with the grounds, but I'm not sure I got them all either. Those two codes I get on my scanner are:

P0361
Ign System Problem
Elec Spark Timing
EST Not Toggling

P0321
Ign System Problem
18x Interupts Lost
Signal

Also at one point back in January probably the srevice light came on so I checked the codes. A MAF code was set, I didn't write it down and it hasn't come back. Thats like 7 different codes I've gotten.

Next step trying a computer? I'm really baffled here. It'* a really clean car with lots of life left, so I'd love to get this figured out.

Thanks guys, Bryan
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Old 05-09-2007, 09:32 PM   #35
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Will they give you any kind of warranty on the used PCM? Can you take it back even for "store credit" if it doesn't work?
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Old 05-09-2007, 09:37 PM   #36
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Not sure, the guy called me back around 430 and said they were going to run the car to make sure the computer worked so I could pick it up tomorrow. I could ask them, wouldn't hurt.
Bryan
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Old 05-09-2007, 09:39 PM   #37
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IF it doesn't fix your problem, and you can spare the cash, you might hold onto it as a spare anyway, since there are known problems with those PCMs.
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Old 05-10-2007, 10:59 PM   #38
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Hey guys,
I put the computer in and it ran fine tonight. That'* not unussual so I'm going to run it tomorrow and see if it stays running. I'll let you know.
Thanks, Bryan
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Old 05-11-2007, 02:03 AM   #39
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Hope it fixes it for you. Mine failed to toggle when it went bad, too.
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Old 05-11-2007, 02:07 PM   #40
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Alright,
It appears to be fine as the commute went well this morning... however, a buddy called me with a flat up the interstate about ten miles away so I went to give him a hand. At highway speed it seemed to have a slight skip, very slight may be nothing but an unbalanced tire, but the service engine light came on. I just checked with my scanner and I'm getting the same codes:
P0361
Ign System Problem
Elec Spark Timing
EST Not Toggling

P0321
Ign System Problem
18x Interupts Lost
Signal
Thoughts?
Thanks, Bryan
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