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Thread: 911E - Engine Cutting Out after warming up

  1. #1
    Junior Member
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    911E - Engine Cutting Out after warming up

    Hi all. I have a '71 911E that I restored a few years ago. The car ran perfectly for over 2000 miles. Recently I went on a 1 hour drive and it ran fine but started to stumble a bit after I got off the highway.
    It runs fine for 30 minutes or so, stumbles a bit , then completely dies. So I pull over, turn off the key for 5-10 seconds, start it again and it runs perfectly for a while - then same thing happens.
    I discovered that if I turn off the key for a 5 seconds or so when it's stumbling and I coast along in gear, and then turn the key it back on, it would run fine for a while. It's as if something electrical is overloading/overheating or something, and killing the power for a moment seems to reset it.
    The MFI was redone by Gus Pfister. Bosch CDI box and RPM Transducer recently redone by Ashlock. I put in a new Parts Klassic coil. I even replace the fuel filter for good measure. Still the same problem. What should I check/test/replace next? Goin' crazy here....
    Thanks.

  2. #2
    Junior Member
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    Do you still have the original coil?

  3. #3
    Junior Member
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    I don't. It wasn't correct when I got the car years ago. So I bought an original black Bosch coil when I restored the car. I recently tried a Parts Klassic coil but I'm still having problems with the motor cutting out as I described above.

  4. #4
    Possibly an overheating fuel pump?

  5. #5
    Swap your coil back to the old Bosch unit you have as a test. Hook up a timing light and see if you've lost spark when it dies. If spark is still good then consider inspecting the in tank filter.
    Early S Registry member #90
    R Gruppe member #138
    Fort Worth Tx.

  6. #6
    Junior Member
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    Thanks for the input! I'll check out the the spark and filter.

  7. #7
    Check your fuel pump pressure.

  8. #8
    Junior Member
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    I will. Pump is fairly new - 2000 miles only. But you never know!
    Thanks.

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