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Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3312
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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2001 Mercury 150efi 2 stroke. Idles rough and will stall

Customer Question

2001 Mercury 150efi 2 stroke. Idles rough and will stall when putting in gear. I have water coming out of pee hole and a lot coming out of exhaust ports just under cowling My port engine does not have this issue. Plus when running boat runs great just rough at idle and stalls at idle
JA: Sometimes boat issues seem like they'll be really complicated, but end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Is there anything else the Marine Mechanic should be aware of?
Customer: No
Submitted: 3 months ago.
Category: Boat
Expert:  Charles replied 3 months ago.

Hello, my name us Charles. I will assist you.

Do you have the serial number of the engine handy?

Customer: replied 3 months ago.
Actually did a compression check and have zero psi on #5 culinder
Expert:  Charles replied 3 months ago.

Ouch. Can you remove the cylinder head and see how bad it is?

Customer: replied 3 months ago.
No boat is in the water. Rebuilt both motors 2 yrs ago and have 300 hrs on them. But that's boating.
Expert:  Charles replied 3 months ago.

That is still rough.. When you do either rebuild them or have them done, Make sure to look at the exhaust tuner inside the drivesshaft housing. It can come loose and partially block the exhaust, and may have lead up to this problem now.

Customer: replied 3 months ago.
My engines were built by a retired factory Mercury rep. But thanks
Expert:  Charles replied 3 months ago.

Your welcome.

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