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  1. R

    PCM Knock Sensor

    I have a 2002 PCM 5.7L HO in a MB Sports Inboard. I've owned it since 2003 and every year, I drain the block to winterize. On the starboard side, the knock sensor is removed. For years, the original knock sensor appeared to have the tip missing but it threaded in and worked fine. Last winter I...
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    Engine Losing RPM and Stalling

    Engine is a 2019 Mercury 60hp Command Thrust on a Crest pontoon. Model: 1F60453LZ Last fall it started losing power at high rpm and would stall. Sometimes it would start immediately. Other times not. I replaced all the fuel filters, spark plugs last fall and winterized it. This spring, the...
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    Stalling on newer motor

    We have a 2019 Crest pontoon with a Mercury 60hp Command Thrust motor. No problems the first two years and then late in the season last year, noticed that the boat would want to stall if RPM's were above 3500. I did the following: new spark plugs new low pressure fuel filter new high...
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    Missing Hose

    I have a 2019 Mercury 60hp Command Thrust outboard. I pulled the boat and notice that this hose seems to be damaged and partially missing. Not sure if it's a vent for the crankcase or it just needs to be capped. Would appreciate any insight.
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    Losing Power at High RPM

    Hello there, I have a 2018 Mercury 60hp Command Thrust on a Crest pontoon and just recently started exhibiting a problem. At higher rpm (4000 and above), the motor will suddenly drop to about 800 rpm. If I leave the throttle lever in place, it will stay at idle. If I move the throttle lever...
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    Johnson AD-10 won't start

    I'm helping a buddy with his 50's era 10hp that won't start. He bought it from a guy who had it running a couple years ago. Motor spins and appears to have good compression. (Thumb Test) Spark plugs fire with healthy blue spark. Installed new plugs Carburetor looks very clean and fills with...
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    Ignition Issues

    My 2002 PCM 350 H.O. stopped running last week, with what I thought was a running out of fuel condition. Instead, I did some troubleshooting. (crank but no start) and determined that the ignition coil wasn't creating spark. The Ignition Control Module ground was suspect (rusty screws that...
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    Ignition Issues

    My 2002 PCM 350 H.O. stopped running last week, with what I thought was a running out of fuel condition. Instead, I did some troubleshooting. (crank but no start) and determined that the ignition coil wasn't creating spark. The Ignition Control Module ground was suspect (rusty screws that...
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    Sluggish engine

    I have a 2002 PCM Inboard (5.7L HO, Throttle Body fuel injection) in a MB Sports Tournament ski boat. I store the boat at my buddy's for the winter and recently took it out of storage. The engine has 850 hours and has been totally bulletproof through the years (lots of passes through the slalom...
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    Coolant Hose Source

    2001 PCM 5.7L HO in Tournament Ski boat I'm looking for a source for the coolant hoses to perform preventative maintenance. thanks, RickR90s
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    Fuel Pressure PCM

    I have a 2002 PCM (350 HO) in my MB Sports Tournament Ski Boat. Hours are 792. I'm reading 30psi off the Shrader valve on the Fuel Control Cell. That seems a bit low to me. What should the continuous pressure be? Also, with key turned on, engine not started, the pressure will rise to 30psi...
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    Blown fuses in 2002 PCM Inboard

    hello everyone, I have a 2002 MB Sports 190 Inboard with the PCM 350 Chevy motor. Its fuel injected with a throttle body and has 786 hours. Last Friday night my buddy and I went skiing and I pulled him with no issues. When it was my turn, the running engine stalled and he could not start it...
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