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311 OBD Code 200 1991

ECU is good as Art said it would be!

So this whole thing must have been some poor or oxidized contacts / connectors. I have since cleaned contacts at ICU, ECU, 12 pin connector connecting interior harness to engine harness, engine grounds, power stage, AMM, and fuses 4 and 6 contacts. There are no water leaks in the cab so this was apparently just 25 years of oxidation.

Engine is now running fine and so far no codes have returned but I will keep an eye on it.

Thanks Art and all others who have replied.

Dan






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