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Dominick
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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4 cylinder , dual carbs, missing at 3000 rpm, will not pull

Customer Question

4 cylinder , dual carbs, missing at 3000 rpm, will not pull , new engine o/h 5hrs.,was running great
Submitted: 1 year ago.
Category: Boat
Expert:  Charles replied 1 year ago.
Hello, my name is***** you for allowing me to assist you today.
Who makes your engine and what HP is it?
Customer: replied 1 year ago.
Volvo penta 140 hp?
Expert:  Charles replied 1 year ago.
I am going to have to opt out on this one. Those are not my specialty.
Expert:  Tan replied 1 year ago.
Hello. My name is***** will be assisting you. How are you determining the engine is misfiring?
Customer: replied 1 year ago.
Rpm radical and you can here slight miss at lower rpm. New coil and fuel filter
Expert:  Tan replied 1 year ago.
Ok remove the distributor cap and see if the distributor shaft moves sideways at all? Have you changed the points and condenser?
Customer: replied 1 year ago.
New points and condenser. Have not checked to see if advance is still working
Expert:  Tan replied 1 year ago.
We need to check the timing advance and we need to see if the distributor shaft has any sideways movement. If the distributor shaft has side play it will change the dwelll causing misfire of the ignition. What happens is the sideways play changes the gap on the points so the dwell isn't steady. You can also check this will a dwell meter. The dwell should be steady at all rpms.

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