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C4 Ground Locations

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Old 03-04-2012, 01:48 PM   #1
94c4er
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Default C4 Ground Locations

I am having intermittent missing on my 1994, changed Opti, Plug Wires, ICM, Opti Harness, fuel injectors, fuel pump, etc. Battery and alt were changed but not because of these problems. Runs fine sometimes and then starts missing above 2K. Everything now is pointing to a possible bad ground or PCM. I can find the ground locations for a C5 but not C4. Can anyone tell me where all the grounds are so I can check and clean them???

Once I figure out the problem, I will post the fix.

THANKS!!
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Old 03-04-2012, 06:19 PM   #2
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Quote:
Originally Posted by 94c4er View Post
I am having intermittent missing on my 1994, changed Opti, Plug Wires, ICM, Opti Harness, fuel injectors, fuel pump, etc. Battery and alt were changed but not because of these problems. Runs fine sometimes and then starts missing above 2K. Everything now is pointing to a possible bad ground or PCM. I can find the ground locations for a C5 but not C4. Can anyone tell me where all the grounds are so I can check and clean them???

Once I figure out the problem, I will post the fix.

THANKS!!
There is a ground on or near every electrical system on the car...everywhere.

BUT, the most interesting bunch are on the block or bellhousing bolt near the oil filter. These include the ecm, interior, most engine sensors, and other misc display and control systems. Not easy to access but critic to have in good condition.
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Old 08-07-2013, 05:19 PM   #3
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thought you were going to post a solution.........
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Old 08-08-2013, 04:17 AM   #4
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Here's a link to the ground locations on an '86. I doubt that many of them moved over the years:

http://home.earthlink.net/~cliff_har...s/grounds.html

I would suspect that your problem is more likely to be either a corroded contact in one the ignition related connectors or your ICM does not have THERMAL grease under it. Some people use dielectric grease by mistake, which will NOT work and cause the engine to cut out when the ICM gets hot. Another possible cause is a loose spark plug wire connector at the plug.
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