Correct ICM for 89 firebird 2.8

jeff89fbird

Join Date: Nov 2006

Posts: 42
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#1

Correct ICM for 89 firebird 2.8

12-16-2009, 02:26 AM

I read somewhere else that usually when buying an ICM, you'll get one that fits and works, but it's not really the right one.

Are there some numbers that I should look for?

I think my ICM is bad, and it was replaced less than a year ago. The one before that also didn't last more than a couple years.

My base timing is screwed up somehow. Advanced itself to 16*, and right now will only start if I have it at 20*. runs rough if I retard it down to 10* where it should be. The EST is unplugged while timing.
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60dgrzbelow0

"Yes... I AM IRONMAN..."

Join Date: Mar 2009

Posts: 1344
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#2

12-16-2009, 09:49 AM

test ICM Ignition Control Module - Third Generation F-Body Message Boards

http://www.thirdgen.org/techboard/tech-general-engine/462711-test-icm-ignition-control.html

Tech / General Engine - test ICM Ignition Control Module - you can take it out and let autozone test it. In my case, the injectors were not pulsing. I had a new ICM. take a test light, ground it, probe both contacts on the injector plug. If you have a steady light, unplug the 4 pin at the base of the ICM and retest....
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