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vacuum advance

  1. No Vacuum reading on throttle body ports

    C900 Workshop
    While adjusting my timing I noticed that my vac advance was still plugged in. I unplugged it and saw that it made no difference. The advance itself works, but I hooked up a gauge to the ports coming off of the TB and noticed that none of the 3 had any vacuum. If I revved the engine the gauge...
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