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Thread: Erratic RPM display

  1. #1

    Erratic RPM display

    So what would be the cause of this? Been running fine for years...

    https://youtu.be/FadkgcgnVsE
    John Kazickas
    Sands Point, NY
    Glasair Sportsman N9GZ

  2. #2
    Advanced Flight Systems Shawn McGinnis's Avatar
    Join Date
    Sep 2012
    Location
    Canby, OR
    Posts
    861
    The sensor wires, if not relieved, can begin to crack as the exit the housing. I've also seen bad spark plug wires / connections cause this due to the EMI noise. Also from alternator regulators going out. Bad engine ground braids giving up. Did you recently service any of the mentioned items?
    Shawn McGinnis

    Advanced Flight Systems
    support@advanced-flight-systems.com

  3. #3
    Just came out of annual so plenty of areas to check.

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