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  1. #1
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    Need so help . 1988 528e.

    The switch on the thermostat housing all the way to the front is the thermo time stitch right? It should be closed above 120 deg F right? Car is running rich and failed smog big time at idle. All the usuals were replaced as O2 sensor. cap and rotor, plugs, valve adjustment and oil. But its rich. I now suspect the time switch is not closing and the car is dumping to much fuel.


  2. #2
    TJ
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    Re: Need so help . 1988 528e.

    The thermo time switch (usually a brown plug) should be open above 95F. Below that temperature, it should be closed for a limited time when starting, causing the cold start injector to spray. If you suspect that the switch is causing a rich mixture by being closed when it shouldn't be, simply unplug it. With that being said, the `88 doesn`t even have a cold start valve or thermo time switch does it?? Check your coolant temp sensor resistance (probably a blue or beige plug), then fuel pressure.

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    No cold start valve. The one at the front is

    a brown plug and single wire.

  4. #4
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    The sensor up front is the temp gauge sensor.


  5. #5
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    Air meter dead and so is the cat :(


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