Stumped engine problem 89s-10 blazer

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#11

03-24-2019, 10:30 PM

LesMyer

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Join Date: Oct 2014

Location: North Central Indiana

Posts: 4,078

Quote:

Originally Posted by Sandman98207

Checked compression again sitting between 180-185 on all 6 cylinders. Swapped ICM just to test and no joy, did timing light and is spot on. So thinking harness or ecu. Will swap them out and see how things go, in swapping ecu I need to swap the proms correct?

Correct and make sure service # on the ECM is the same.

#12

03-25-2019, 09:52 AM

Sandman98207

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Join Date: Mar 2018

Location: California

Posts: 32

Quote:

Originally Posted by LesMyer

Correct and make sure service # on the ECM is the same.

Thanks Les gonna ohm out harness, and compare to spare first, May find a loose connection and want to make sure harness is good and not shorted or grounded causing ECU to fry.