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  1. J

    Backfire at half throttle and tach show 6k.

    I have a 98 Mariah Z202 with a 5.7 Mercruiser. I am having a problem once the engine reaches temperature. The boat will accelerate up to 3k RPM's, then the tachometer will peg out to 6K and the engine will backfire. Think of accelerating like you are pulling a knee board or kids on the tube...
  2. J

    Engine backfire at half throttle

    Hello, Having an issue with my 5.7 mercruiser. Issue only happens at temperature, boat will run fine up to 3k RPMs then the tachometer will jump up to 6k and the engine will backfire, pop, and sputter. If you advance the throttle tachometer will eventually come back to normal reading and the...
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