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4.3 Mercruiser - Shuts down for 1 second, restarts, and repeats

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  • 4.3 Mercruiser - Shuts down for 1 second, restarts, and repeats

    Starts fine. Usually gets up to 3,800 rpm range for a few minutes, then the problem starts.

    The cycle is quick. First the hesitation, then the warning horn, then starts again...that is like 1 second, then 5 seconds later, the cycle repeats.

    If I pull the RPMs back to 2000ish, the problem goes away immediately.

    The MAP sensor is indicating a fault, so replacing that, its on order.

    Any other ideas?

    Btw, twin 4.3 Mercruisers on a Searay Sundancer, with Alphas, 2001. Throttle body fuel injection.
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