Test Results on ECT and EEC-IV: HELP!!

[jimberg]

It does sound like your ECT is reporting lower temps to the ECM than it should. If it never reports a temp that is warm enough, your car will stay in open loop mode and not adjust fuel delivery according to O2 sensor readings. Like PKRWUD has been saying, though, the computer should catch that when you do a KOER (Engine running) test.

It sounds like your problem may be a little more systemic, though. Have you checked your engine block ground strap to make sure it is making good contact? You may have a simple grounding issue somewhere.


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351W 89 Mustang GT Convertible