code 42 EST - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-09-2008, 10:22 AM   #1
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Default code 42 EST

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hello i have a 91 bonny with the 3.8 vin c lately once or twice a month it will shut down or keep running and backfire i will shut key off three times and will be fine the only code is 42 thanks i have been reading this forum a good bit
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Old 04-09-2008, 07:07 PM   #2
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do you have spark? I would look into replacing your coils and/or ICM
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Old 04-14-2008, 07:31 PM   #3
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Originally Posted by harofreak00
do you have spark? I would look into replacing your coils and/or ICM
i have the same code ( 42 ) now in my 88sse and i replaced the icm and the coils so now im almost 100% positive its the engine wire harness that comes from the icm as it gave me a problem last year so now its time to be replaced completly..

if its not the icm or coils then check you wire harness for rips or tears..


also check the main engine ground wire right under the ignition coil module... that was an issue for me as well...

and im not to sure about the back firing.. i never had that happen with code 42....
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Old 04-17-2008, 01:42 PM   #4
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hey did you ever figure out what was wrong..?
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Old 04-23-2008, 06:18 PM   #5
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i guess he was a one post wonder huh.
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Old 04-24-2008, 09:04 PM   #6
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Default code 42 yeah

i replaced the coil and control module -acdelco
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Old 04-25-2008, 01:12 AM   #7
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So did that solve the problem?
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Old 04-25-2008, 05:26 PM   #8
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Default code 42 est

yeah replacing the coil and control module fixed my problem i just got a 91 bonny through work so i have plenty of parts thanks
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