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Old 01-10-2006, 07:55 PM   #21
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Quote:
Originally Posted by jr's3800
On the 95'* the PCM simply needs to be replaced and you need to swap in the EPROM from the old PCM... SES with no codes makes me think that there is an issue with the PCM... If you were near me we could easily test it all out... The PCM removal and replacement only takes a few minutes and is easy... There is no reprogramming involved on the 95 Bonnevilles

I can't say for certain that the PCM is the problem, I'd swap in a known good unit which I finally have as a trunk PCM for long trips.. If the SES light goes away and the car runs good again, then you know you have cured the problem... But again I can't confirm a bad PCM from here.. But I do feel its the problem... And in rare cases the EPROM can be bad too...

What is the manufacture date on the door of the car? I'm wondering if you have an early build 95 Model... Mine was built 12/22/94... Some of the earlier 95'* had some EPORM issues...And I have killed off the original PCM and a Reman PCM... Have been running a PCM from a low milage 95 and have had no further issues at all...
Manufacture date is february 95...


EDIT: And I'm confident that it is the PCM...that'* what the manual says, that of the KC, and at least according to the scanner the KC is working properly. I guess GMpartsdirect.com sells them remaned for $120 or so.
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Old 01-10-2006, 07:58 PM   #22
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Hmmmm... Not sure about that one... Bring it down to Florida and we'll fix it right quick...LOL

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Old 01-10-2006, 08:02 PM   #23
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Quote:
Originally Posted by jr's3800
Hmmmm... Not sure about that one... Bring it down to Florida and we'll fix it right quick...LOL
What do you think a tow from say El Paso would be? I feel I could run this thing for a few hundred miles before it pooped out. lol
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Old 01-10-2006, 08:08 PM   #24
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I just pulled out the old unit...it'* a remanufactured unit.
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Old 01-10-2006, 08:28 PM   #25
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Quote:
Originally Posted by gruveb
I just pulled out the old unit...it'* a remanufactured unit.
OMG... That my be the problem... Mine fried... Start the car ans 2 minutes later it shuts off... SES light would come on and go out, car would loose all power while driving, gages would drop, then all would come back to life again... It was freaky...

Oh this was a Reman PCM that left me with those Issues BTW

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Old 01-10-2006, 09:13 PM   #26
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One more question...how can I tell, without swapping known good parts, if the problem is the pcm or the prom?
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Old 01-10-2006, 11:37 PM   #27
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Quote:
Originally Posted by gruveb
One more question...how can I tell, without swapping known good parts, if the problem is the pcm or the prom?
On this one I think we will have to follow the service manual... But an SES with no codes would lead me to the PCM... I have rarely seen the EPROM fail.. Have you pulled the cover off of the PCM to ensure that the EPROM is seated?

Thats the first thing the service manual says...

Also what engine is in your car? 3800 Series I Supercharged Vin 1, or 3800 Series II Vin K?

The computer in your car was used for 2 years in a wide variety of C and H body GM full size cars with the 3800 line...

Sometimes even with newer cars its still a task to get problems solved...

Anyone else have any thoughts?

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Old 01-11-2006, 11:13 AM   #28
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Don, I don't suppose swapping my '97 SCed PCM would be of any help, would it? After all, I am in Arizona and would be willing to drive anywhere in the state to help a fellow bonne owner.

Also, if my '97 PCM won't work, I have a co-worker with a 95 SE with 61,000 miles on it. Is there any danger of messing up his PCM if I were to ask him to borrow it to try on gruveb'* car?

gruveb....you have a PM
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Old 01-11-2006, 03:52 PM   #29
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Quote:
Originally Posted by Echo SSEI
Don, I don't suppose swapping my '97 SCed PCM would be of any help, would it? After all, I am in Arizona and would be willing to drive anywhere in the state to help a fellow bonne owner.

Also, if my '97 PCM won't work, I have a co-worker with a 95 SE with 61,000 miles on it. Is there any danger of messing up his PCM if I were to ask him to borrow it to try on gruveb'* car?

gruveb....you have a PM
The one from your 97 wouldn't work..

But the other from the 95 would... I have yet to see an instance where I have destroyed a PCM... Or caused it any harm by using it for testing...

If you could use it than go for it and see if his car runs better... Bob, PM me later as I may have something to help you if you go that route...

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Old 01-12-2006, 12:43 PM   #30
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I picked up a new ecm from autozone on the way home last night, 100 bucks even. Slapped it in this morning and it runs perfect now. Gonna go run some errands shortly, we'll see if it really works.

Thanks everybody for your help.
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