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Thread: Micro Switch help

  1. 05-28-2023, 02:17 PM #1
    Simonjjb
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    Micro Switch help

    I have read a number of threads on this.

    When I follow Mr Mayo's instructions for my 1971S MFI, I turn the microswitch screw down until I hear the switch click. Then I turn it one more complete turn. If I do this the car will start and die when I lift off the accelerator. If I hold the switch down it does the same thing - it kills the engine. Any thoughts?
    1968 911L Coupe - Golden Green
    1971 911S Coupe - Gemini Blue
    1973 911S Targa - Signal Yellow
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  2. 05-28-2023, 03:09 PM #2
    edmayo
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    It sounds like the speed relay isn't working. I assume when you take the microswitch out of the circuit it idles normally? The speed relay needs to be replaced or rebuilt.
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  3. 05-28-2023, 03:53 PM #3
    Simonjjb
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    Let me try that. Thanks Ed!
    1968 911L Coupe - Golden Green
    1971 911S Coupe - Gemini Blue
    1973 911S Targa - Signal Yellow
    1974 914 2.3 - Sunflower Yellow
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  4. 05-30-2023, 02:09 AM #4
    frederik
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    You can open the speed relay and check the components. Usually the transistor leads are rusted. If you're handy with a soldering iron, you can easily replace them -- this fixed the speed relay on my Targa.

    Some helpful links:
    http://forums.pelicanparts.com/porsc...-problems.html
    http://forums.pelicanparts.com/porsc...ch-module.html
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