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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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Evenrudemodel mid range rpm miss. had prblem with oil

Customer Question

evenrude(###) ###-####model mid range rpm miss. had prblem with oil injection pump and it is replaced with new pump ...low rpm fine
Submitted: 4 months ago.
Category: Boat
Expert:  Tan replied 4 months ago.

Hello. My name is Tan.

The only way to find a mid range misfire it with the use of a timing light. Connect a timing light to the top cylinder run the boat and watch the flash of the timing light. The flash should be steady with no dead spots. If no misfire move to the next cylinder. If you find a misfire swap that cylinder coil with a known good firing cylinder. If the misfire moves then that coil is bad. If the misfire moves then the problem is with the power pack. It won't be the stator as you would have no or weak spark on all cylinders. It won't be the sensor as it would not fire at low speed.

If this is a fuel injected motor the timing light applies. If you have no failing coils then the EMM will be bad.

Post back with questions and findings.

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