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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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1985 E90TLCOS, what is causing engine rpm dies once engine

Customer Question

1985 E90TLCOS, what is causing engine rpm dies once engine is warm and throttle is advanced to high speed?
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.
Hello. My name is***** can be a whole list of things. We need to start with doing some checks to find what is causing the issue. First we need to do a compression test. The compression must be 80+ psi with no more than 10% difference between cylinders. Then we need to do a spark gap terst using a spark gap tester or a timing light. The spark must jump a 7/16" gap on a spark gap tester or have a steady flash on the timing light under a load or when the engine is loosing rpms. If these check good then when you run the boat squeeze the primer bulb. Does engine run better? If no change choke the engine when engine is acting up. Does it run better?