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Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 10630
Experience:  40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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Mercruiser 7.4. Been sitting two years. Cranks and runs good

Customer Question

Mercruiser 7.4. Been sitting two years. Cranks and runs good above 2500. Dies at low rpm unless throttle is pumped.
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.
Hello. Could I get the engine serial number please?
Customer: replied 1 year ago.
It's a 1996 model. 300 hp with carborator. Will be a few days to get serial no
Expert:  Tan replied 1 year ago.
Ok try tiis with the flame arrestor off close the choke about half see if you can get the engine to idle by using the choke plate. If you can get the engine to idle then you have a dirty carburetor or a vacuum leak. Has the engine been sitting unused for awhile? Chances the carb is the problem.

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