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Old 09-04-2017, 03:01 PM
Junior Member
Join Date: Apr 2013
Posts: 2
Exclamation 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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4.3, engine stall

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