PCM problem? Clicking relays/no start - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-17-2008, 04:52 AM   #1
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Default PCM problem? Clicking relays/no start

Hi and thanks for helping.

My 95 Bonne started stalling and would sometimes not restart. There are some relays clicking when it will not restart; fuel pump I believe.

I have spark and I have fuel pressure so it seems the injectors are not firing.

Where is the PCM? The parts store only lists an ECU - it this the same thing, the shinny box on the inside firewall about 6 x 6" and about an inch thick?
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Old 07-17-2008, 07:06 AM   #2
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First thing I would check in this situation is the battery cables. Bonnevilles suffer from corrosion at a much higher number than most cars. Remove the battery cables from and take the bolt out of the rubber boot, then remove the rubber boot. Clean any corrosion like it'* the enemy and reassemble with a little dielectric grease.

Now if that doesn't work..94 and 95 are the worst years for pcm failure. The pcm is located in the passengerside footwell. Remove the hushpanel under the dash and follow the carpet up to the firewall. The biggish silver box with red white and blue connectors is your pcm. It is easiest to disconnect the wiring and then unclip the tabs and wiggle to get out. Remember to remove the access panel screws and switch over the Eprom chip for your cars programming.
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Old 07-17-2008, 12:36 PM   #3
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Thanks!!!!

I thought that was the part, they just called it something different at the parts store and this car has so many 'thinking boxes' under the dash and under the hood that I was sure, with my luck, I would replace the wrong part.

The car has good power and from searching and reading I checked out the grounds. While the battery connections could be cleaner, the connections seem to be solid with no problems.

There is a you pull junk yard (Crazy Ray'*) that sells ECM'* for about $25. I will just try to find another 95 Bonne and swap out my chip and hope that gets it.
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Old 07-17-2008, 01:54 PM   #4
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Thanks!!!!

I thought that was the part, they just called it something different at the parts store and this car has so many 'thinking boxes' under the dash and under the hood that I was sure, with my luck, I would replace the wrong part.

The car has good power and from searching and reading I checked out the grounds. While the battery connections could be cleaner, the connections seem to be solid with no problems.

There is a you pull junk yard (Crazy Ray'*) that sells ECM'* for about $25. I will just try to find another 95 Bonne and swap out my chip and hope that gets it.
Almost any 94/95 will work. Transport, LeSabre, Bonneville. Don't worry about the programming. Just swap your chip into the one you get and it should be golden. I think I've swapped about 5-10 pcm'* and had the vehicles come right back to 100%.
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Old 07-18-2008, 03:24 AM   #5
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Oh man! That is some seriously helpful stuff right there!

Thank You!
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Old 07-18-2008, 07:14 AM   #6
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A lot of yards will also print off the interchange for any part if you ask them. I found this extremely helpful on more than one occasion.
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Old 07-20-2008, 04:08 PM   #7
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Talking Fixed

Engine Control Computer fixed it!

It is about 1000000*F outside and walking around a junk yard to pull an ECC that may be bad or close to it did not seem like fun - Advance Auto $120.00

Thanks again
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Old 07-21-2008, 08:47 AM   #8
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Glad to hear it was a quick and easy fix.

I actually was in the junkyard this weekend at the million degrees. Next time I'll take your way and hit the parts store.
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