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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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350 mag. Engine runs fine up to 3200 RPM. Engine backfires

Customer Question

350 mag. Engine runs fine up to 3200 RPM. Engine backfires and sensor alarm goes off. Constant alarm. Once engine is under 2000 rpm it runs fine with no alarm.
Submitted: 1 year ago.
Category: Boat
Expert:  Jason replied 1 year ago.

Hi David, my name is Jason.

I read what you wrote. What kinds of questions did you have?

Customer: replied 1 year ago.
what would cause these symptoms?
Customer: replied 1 year ago.
Engine issues above 3200
Expert:  Jason replied 1 year ago.

Is the alarm a constant tone or so many beeps per minute following a pattern?

Customer: replied 1 year ago.
constant tone. The Alarm sounds at the same time the engine starts to backfire and run rough. Runs fine with no problems as long as under 3000rpm. oil pressure fine, engine temp fine.
Customer: replied 1 year ago.