bigpips305
New member
I have a nice 2015 (NOT 2014) Mercury Fourstroke. It is serviced regularly, and still under warranty but our local shop is backed up for weeks for dockside service, which they insist is necessary to check the motor and duplicate the symptoms.
Lately, after crankling and idling perfectly out of the canal, when attempting to accelerate and get on a plane, right at or right about 3,000 RPMS, there is severe hesitation/misfire. It as if its loosing 2 cylinders of spark. The motor is literally jumping up and down back and forth. You fear it would rip right off the transom. It runs great and still planes at about 2400-2800, so this is the speed we cruise at to our destination. If you try turning it off and back on any time in early on in the trip. The symptom is the same. However, once we reach our destination. Sometimes a half hour cruise, sometimes only a 5 minute cruise, anchor and shut the motor down for some time, upon restarting and heading back the motor runs fine. It will run all RPM ranges and cruise nicely. SOMETIMES, cruising back at 3500 or more, randomly, the symptom will intermittently return, causing an immediate decline in RPMS and sending any poor souls standing flying to the front of the boat. Ive checked for water in the fuel, spark plugs, and connections. Any ideas?????
Lately, after crankling and idling perfectly out of the canal, when attempting to accelerate and get on a plane, right at or right about 3,000 RPMS, there is severe hesitation/misfire. It as if its loosing 2 cylinders of spark. The motor is literally jumping up and down back and forth. You fear it would rip right off the transom. It runs great and still planes at about 2400-2800, so this is the speed we cruise at to our destination. If you try turning it off and back on any time in early on in the trip. The symptom is the same. However, once we reach our destination. Sometimes a half hour cruise, sometimes only a 5 minute cruise, anchor and shut the motor down for some time, upon restarting and heading back the motor runs fine. It will run all RPM ranges and cruise nicely. SOMETIMES, cruising back at 3500 or more, randomly, the symptom will intermittently return, causing an immediate decline in RPMS and sending any poor souls standing flying to the front of the boat. Ive checked for water in the fuel, spark plugs, and connections. Any ideas?????
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