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- - Bad new ICM? (https://67-72chevytrucks.com/vboard/showthread.php?t=843961)

snowball

04-21-2023 01:24 PM

Bad new ICM?

Hi all,

My truck died 6 months ago and I was too busy to fix it. turned out it was the Ignition Control Module. No fire, no fuel.

I replaced with with a GM original. now she is ROUGH! Hard to start. Idles rough. Backfires. Hesitates.

I put in fresh fuel. Same problem.

Bad ICM or should I look at something else?

Yes. I did put the thermal paste on the new ICM.

Thanks

1990 350 R1500

Corts60

04-23-2023 04:07 AM

Re: Bad new ICM?

Did you reset timing? Perhaps something changed there.

snowball

04-24-2023 06:20 PM

Re: Bad new ICM?

I did not.

I need to get a new one. Last one broke. any recommendations?

Corts60

04-26-2023 01:05 PM

Re: Bad new ICM?

Quote:

Originally Posted by snowball (Post 9199147)

I did not.

I need to get a new one. Last one broke. any recommendations?

You mean your timing light broke? Any brand is fine I’m sure. I like the ones that can advance in degrees to check total timing.

chris989

04-26-2023 05:39 PM

Re: Bad new ICM?

Quote:

Originally Posted by snowball (Post 9198259)

I went through a hand full of modules inside the distributor. most are chinese junk with little or no heat sink.

Now i keep an extra in my glove box

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