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Ask Dominick Your Own Question
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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I'm jimmy

Customer Question

hi i'm jimmy
Submitted: 2 years ago.
Category: Boat
Expert:  Jason replied 2 years ago.
Hi Jimmy, my name is Jason.
Have you checked engine compression, as well as spark output from the ignition coils?
How old is the gas?
Customer: replied 2 years ago.
getting about 110 , new filter the gas is about a week old.
killed the vro pump and now doing the mix in the tank 50-1
Expert:  Jason replied 2 years ago.
Have you checked spark output with an adjustable gap spark tester, or a timing light?
Customer: replied 2 years ago.
coils and power pack are new. runs great at about half throttle. more then that its like a misfire.
Expert:  Jason replied 2 years ago.
When did the engine last run correctly?
Customer: replied 2 years ago.
may of this year. run great then the next time out . spit and sputter
so i done thermastas 2. temp swicthes 2. waterpump.
Expert:  Jason replied 2 years ago.
Does your alarm system work on the engine? When you turn the key to start, does it beep every time?
Customer: replied 2 years ago.
yes. when all this started i wound run full throt. and the alarm wound sound. pull out to a idle the alarm would stop.
Customer: replied 2 years ago.
i understand a new part can be bad. but it has a hard time on start will die out some times at idle.
Expert:  Jason replied 2 years ago.
What is the highest rpm the engine will run before it acts up?
Customer: replied 2 years ago.
about 2200.
Expert:  Jason replied 2 years ago.
Got it. If you are looking to do this yourself what you would have to do is check spark at 2200 rpms when it cuts out with a timing light, and see if spark is cutting out on certain cylinders. That would be the next step.
Customer: replied 2 years ago.
ok.. sounds like i'm back where i started
Expert:  Jason replied 2 years ago.
If you want to figure out the problem you have to troubleshoot it by the book. There really isn't any kind of shortcut here.

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