Never Seen This Before! - Page 2 - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat

Oldsmobile When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

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Old 06-13-2016, 10:06 PM
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Forgot to mention, if this is a redundant ground, it may not be a problem.....sometimes a PCM/ECM Circuit may have more than one ground to it...so if one is lost, there is another in parallel to do the job.....the only way to know is by looking at a wiring diagram....

If this ISN'T a redundant ground, then you have a problem....

But as I said before, late 80'*, early 90'* ECM'*, had lots of problems....even when replaced with a rebuilt, there could be another problem in the "new" ECM....I have had rebuilt'* right out of the box(PROM transferred), not start a car...

Majority of ECM grounds are located on studs on the transmission....might be worth it to do visual inspection there, and give each wire a tug.....
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