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Recent content by boomsite

  1. B

    Iginition Timing stays advanced during idle

    "I have a 1990 7.4L Mercruiser "I have a 1990 7.4L Mercruiser with a Thunderbolt IV ignition that I can't get the timing to 8 deg TDC; it stays advanced at approx. 25-30 deg. BTW, the engine starts easy/immediately, idles less than acceptable with the slight cackling sound. Upon rotating the...
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