94/95 bonneville problem - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-15-2007, 02:05 PM   #1
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Default 94/95 bonneville problem

so my girlfriend'* bonneville just dies randomly at any RPM while idling or driving. it'* happened before on the highway and i dont want her to freak out and get into an accident because of it.



just before the car dies the check engine light flashes and it dings 3 times. silimar sound to that of a courtesy chime (when the doors are open and the key is in) but it'* faster. the car will also start right back up as if nothing happened.



i pulled each plug off of the coil pack and post/wire #5 was all corroded. i had her start the car up and there was still spark arching from the post to the wire.



a car needs 3 things: fuel, air, spark. im convinced it'* not the pump because the car will start back up and run fine. im not sure about the spark - can coil packs go bad, but still run? and i haven't checked the air filter yet. could it be the fuel filter?



i dont want to go throwing money at problems.



also where is the harness to read the codes from the computer?
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Old 07-15-2007, 02:21 PM   #2
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Please post mechanical problems in the mechanical section.
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Old 07-15-2007, 02:22 PM   #3
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Welcome to the club! In more ways than one

The OBD connector is underneath the steering column, but be warned: the 94-95 protocol is manufacturer-specific. Very few scantools can read them, and more than likely AZ or Advance Auto or any other place like that will not have the scanner you need.

I'm inclined to say it is the computer itself that is giving you issues. 94-95, again, have reliablity issues with those PCMs.

Stalling could also be happening with your coil packs, and yes coil packs can have hairline cracks that allow voltage leakage. Or it could be the plug wire boots not sealing correctly. Either way, the leakage needs to be addressed.
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Old 07-15-2007, 02:29 PM   #4
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Quote:
Originally Posted by sandrock
Welcome to the club! In more ways than one

The OBD connector is underneath the steering column, but be warned: the 94-95 protocol is manufacturer-specific. Very few scantools can read them, and more than likely AZ or Advance Auto or any other place like that will not have the scanner you need.

I'm inclined to say it is the computer itself that is giving you issues. 94-95, again, have reliablity issues with those PCMs.

Stalling could also be happening with your coil packs, and yes coil packs can have hairline cracks that allow voltage leakage. Or it could be the plug wire boots not sealing correctly. Either way, the leakage needs to be addressed.
so you think it'* the computer? where does the computer ground? could the ground be corroded? is there anyway to check that it'* the computer by probing the pins?

her dad said something about a key and the transmitter in the key and making a new key would solve it or something
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Old 07-15-2007, 02:35 PM   #5
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That brings up another possiblity. Your ground buss may very well be corroded. That'* underneath the carpet, driver side, front, near the parking brake if memory serves.

If it is the computer, it won't be a ground issue. It would be an internal fault. Gearheads on this forum will tell you in a heartbeat that 94-95 PCMs are nothing but foul pieces of work. Though they do work very well when they ARE good

New keys and transmitter? That will solve nothing except a possible no-start condition that is VATS-related. And you would know if it is VATS if the security light on the dash is involved
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Old 07-15-2007, 02:40 PM   #6
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do you have a picture of it so i know what i'm looking for?
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Old 07-15-2007, 02:43 PM   #7
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Search is your best friend on this forum

http://www.bonnevilleclub.com/forum/...ht=ground+buss

Pics are about halfway down.
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Old 07-15-2007, 02:54 PM   #8
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There are a lot of things we should have you check before saying it'* a PCM. We should never suggset PCM first unless all other checking has been done first. Simply put..the PCM could be the issue..however we should not jump to any conclusions and there is no solid test that rules out the pcm as bad from the beginning. It'* a matter of testing/checking that leads us to a pcm.

Pull your battery cables at all ends.. remove the rubber boots and look under for corrosion. This is probably the highest probability of the issue. Clean all connections.

Next up..if you've had any water leaks the ground buss' are a good second item to check. Again corrosion is the enemy.

I have found the local Autozone scanner doesn't scan 94/95, but advance and many of the Actron scanners can. Also post up your city/state and maybe there'* a local member with a scanner.
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Old 07-15-2007, 03:18 PM   #9
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That'* good to know Advance has a compatible scanner available. And the PCM thing, as Boosty said, should be a last-to-look-at item. (I kinda jumped the gun on that one.) Yes, do go over the GB and battery posts to make sure there is no corrosion. A dab of dilectric grease will keep corrosion at bay afterwards.

I would also check UNDER the coil packs for corrosion too. And check the coil resistances via information under techinfo. Willwren has an excellent writeup on how to do that.
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Old 07-15-2007, 03:35 PM   #10
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it'* not the battery terminals, i've already checked them. i have an actron scanner, also. is this an OBDI car or an OBDII? is this a single coil pack car or are there 3 with 2 posts per coil pack? thanks
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