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Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 14305
Experience:  Degree in Marine Technology. Gas and diesel marine mechanic.
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My 2009 Yamaha VMax 2ooHP HPDI has a engine miss. On two

Customer Question

My 2009 Yamaha VMax 2ooHP HPDI has a engine miss. On two cylinders the coils will fire for about 5 seconds an then quit firing any suggestions?
Submitted: 10 months ago.
Category: Boat
Expert:  Jason replied 10 months ago.

Hi Roy, my name is Jason

Is this happening at idle or full throttle? Does the engine make full power? How long have you owned this engine for, and has it ever been any different in the past for you?

Customer: replied 10 months ago.
Ive owned motor for three years replaced plugs 6months ago it started two have hard time starting and now has a miss at idle and not fev up as it should
Expert:  Jason replied 10 months ago.

Does the engine make full power under a load? What is the max rpms the engine will do with the boat in the water?

Customer: replied 10 months ago.
No doesn't get full power max rpm 4,000
Expert:  Jason replied 10 months ago.

Okay. Step 1 is to swap the non firing coils for coils that are firing, does the problem follow the coil, or does it stay on the same cylinders? Also, which cylinder specifically are not firing?

Customer: replied 10 months ago.
Don't know answers to your questions I will try swapping coils and go from there
Expert:  Jason replied 10 months ago.

Let me know how you make out.

Expert:  Jason replied 10 months ago.

Hello, just checking in. Any luck?

Jason

Customer: replied 10 months ago.
Haven't had time to do anything yet
Expert:  Jason replied 10 months ago.

Okay, let me know how you make out.

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