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Strangest thing I've ever seen in 45 years working on cars on a 1991 Olds 98.

Old Dec 24, 2020 | 03:52 PM
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Default Strangest thing I've ever seen in 45 years working on cars on a 1991 Olds 98.

I have a 91 Old'* 98...Series 1 3800 non-supercharged.......... when the engine is cold it will not start BUT if I put a spark tester on the 1, 3, or 5 tower on the coil it'll start...... THEN when the engine gets to operating temperature the engine will run without the spark tester in place BUT it will not start/run until the engine warms up......... ANYONE dealt with anything like this? I even moved my grounds to see if it was a grounding problem.......still no luck..........
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Old Dec 24, 2020 | 05:18 PM
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Sounds like the ICM or maybe a connection under the coils.
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Old Dec 24, 2020 | 11:37 PM
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ICM is known to do this.
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Old Dec 24, 2020 | 11:43 PM
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Can you explain why? This is a brand new ICM.... I guess I need to take it up and have it tested.....
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Old Dec 25, 2020 | 12:15 AM
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Clean the grounds (plate and bolt holes) for the coil pack/ICM.
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Old Feb 20, 2021 | 03:35 PM
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Done it..... no luck but with my volt meter I'm getting good ground.
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