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B23F bad AMM or coolant temp sensor 200 1983

posted by  jimo14 on  Fri Apr 27 08:16 CST 2012
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Can a bad coolant temp sensor mimic the same bad running problems as a bad air mass meter? The only way my wagon will run and stay started is with the air mass meter unplugged ("limp home mode"). Before I spring for a new AMM ($), I'd like to be as sure as I can as to what's causing my wagon to run like crap.

I tried running tests yesterday probing the sides of of the ECU connector (plugged in) as per the Bentley manual, but don't trust my results. In most cases, I got no readings (ohms, continuity, etc.). I chalk this up in large part to my inexperience and lack of know how.

My engine wiring harness is new, so I'm confident it's not an issue with that. I have 2 ECUs, have tried both, same results. Could the one wire O2 sensor be a culprit in this bad dream? I just solved a very bad running condition in my '91 240 by replacing the O2 sensor (3 wire). Thanks for any insight here - Jim






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New ANSWERED B23F bad AMM or coolant temp sensor [200][1983]
posted by  jimo14  on Fri Apr 27 08:16 CST 2012 >


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