Should I replace my ICM? '89 Bonneville - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-01-2009, 03:29 PM   #1
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Default Should I replace my ICM? '89 Bonneville

Delta 88 Royale Brougham
engine 3800 Vin C, Mileage 202K
1989 Delta 88 green goo when I went to change coil pack with an AC delco d552 coil pack
Problem cold Hard start when ambient temp is less 30 degrees
Coil ohms readings; secondary 11.8k; 12k; 13.84k; primary .7ohms; .7ohms, 0 ohms

Car runs fine otherwise.
Any suggestion on what use to clean the green goo up. It is mostly on the lower third of the module. If I can clean it up I think I might try it as is. I was not planning on needing an ICM as well but may have no choice.

Also any suggestions on ACdelco ICM vs aftermarket. On this page aftermarket has had some problems. Normally I go ACdelco; this ICM module (ACdelco D1922A) is very expensive.

Thanks for any suggestions.
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Old 03-01-2009, 03:35 PM   #2
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Moved this question to it'* own thread. Please try not to post to 5 year old threads.


If the ICM is working then try new coils. If all works, leave it.
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Old 03-30-2009, 11:28 PM   #3
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I have owned many 1988-1990 H body vehicles - a cold hard start could be caused by a defective
fuel pressure regulator - located on the front fuel rail - pull the vacuum line off the fuel regulator and
check to see if it is wet with gas - replace it if it is. You also may want to check fuel pressure - what happens when the fuel regulator diaphragm leaks, the system loses pressure when the car sits for a while, causing a hard start - especially when cold outside. Hope this helps.
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