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ECU is a suspect? 200 1989

posted by  someone claiming to be macs70GLT on  Sun Jun 3 00:38 CST 2018 [RELATED]

So today I received both the -951 ecu, and the new intake manifold gasket. Swapped in the -951 ecu for the pink label ecu and... the rough idle continues. However I now have a more reliable ecu, so I've got that going for me - which is nice.

Tonight I've been taking things apart to check on the manifold gasket. Well trichard was on to something. The gasket split between cyl 3 & 4, half sticking to the head. But at the forward edge of cylinder 1 about 120 degrees of circumference was broken off & missing completely!

I'll finish it up tomorrow - pretty confident this was the root cause.

Thank you all for your inputs. Guess I'll hang on to the pink label ecu as a spare but it won't go back in unless there is a serious problem.

Thanks

Mike






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