Stumped engine problem 89s-10 blazer

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Mar 24, 2019 | 10:30 PM

#11

LesMyer

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Joined: Oct 2014

Posts: 4,336

From: North Central Indiana

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.

Mar 25, 2019 | 09:52 AM

#12

Sandman98207

Thread Starter

Beginning Member

Joined: Mar 2018

Posts: 32

From: California

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.