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Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3427
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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1997 SeaRay 37 Sedan Bridge, twin mercruiser 7.4 MPI. Port

Customer Question

1997 SeaRay 37 Sedan Bridge, twin mercruiser 7.4 MPI. Port engine top overhaul/starboard full overhaul. Cannot get more than 32-3400 rpm under load. Have at least 25% more throttle movement with no engine response. Seems like they are being limited-no surge/strain or audible struggle to answer throttle demand. No computer codes/changed MAP sensors/bottom clean/no fuel issues/props taken 2 degrees/ all troubleshooting efforts by my mechanic have had no effect. Collaboration with other area mechanics with negative results. In passing, "throttle position limiter" was discussed as a remote possibility-can this be the culprit. Been working this problem for almost a year! What's your take?
Submitted: 8 months ago.
Category: Boat
Expert:  Charles replied 8 months ago.

Hello, my name is***** will assist you.

Expert:  Charles replied 8 months ago.

If by Props taken 2 degrees, you mean that pitch was added to the props, that would lose RPM on the engine. Every 1 degree is worth about 200 RPM on engine speed. Also ensure with the engines static and the key on that both throttles are going to 100% on the computer. You could just have a cable issue on the engine.

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