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Boat Repair/oil sensor shutdown
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Question
I have a 1997 175hp Johnson outboard. After running the motor hard for less than 3-5 minutes the motor will cut back to slow rpm and begin to miss. the water pressure reads good, no overheating and the oil flow seems ok.
Are there any alarms? Your engine may be going into a "protect mode". It can be triggered from the oil injection system, overheating or over reving the engine. Some motors also have a vacuum fuel flow sensor that tells when adequate fuel is not getting to the engine.
You will need to diagnose each sensor and system one at a time. You will need the OEM service manual for this, or take the boat to a good, competent service center.
If it isn't the sensors or the above it could be a failure in the ignition system. Here again it will need a good check out, not something for the home mechanic.
Post back if you need further help.
Jeff
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Jeff Grigg
Expertise
Can help with most any question related to outboards, high performance, hull repair, rigging, if it floats and uses a motor. From a 9.9 on a aluminum boat to DFI two strokes. Outboard motors are my specialty. I can help with some I/O questions as well. Ratings are the only way we know if we are helping. If you are pleased with the help, please rate us. 20% don't bother reading my answers! If you are not going to read the follow up then why ask? Keep in mind we do this at no charge and are not paid. We do it to help you!
Experience
32 years in the marine business. Own a service facility, in coastal South Carolina certified Master Tech by Johnson/Evinrude, certified Mercury/Force, Tohatsu/Nissan. Former technical director for DMI Pistons. 30 year racing career including 3 APBA Formula V National Championships
Organizations
AMTECH, APBA
Publications Written For
Boat & Motor Dealer, Car Classics, Custom Vans (tech articles), Miami News, powerboat racing column
Awards and Honors
Certified Master Technician Johnson/Evinrude
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