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1986 325 running rich + rough

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    1986 325 running rich + rough

    Symptoms:
    Runs very rich when hot/cold.
    Runs rough only when cold.

    So far I've put in a working O2 sensor, tested fuel pressure, had a smoke test done, cleaned the idle control valve and tested the coolant temperature sensor. The only thing I can think of is perhaps the CTS wire isn't reaching the ECU. Is this possible/testable?

    I'm going to run through the Bentley manual tests soon but I was wondering if there was a test or two that seems to fit my problems.

    Thanks.
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