2001 F115 Power Loss

[markman]

My 115 experiences power loss and sputters only when warm. When cold, the motor has plenty of power throughout the RMP range. After 5 minutes of water skiing, the motor sputters and spits after throttling back to idle, and then kills most of the time. It then starts easily, but runs roughly at idle for a minute or so before idling smoothly again. But all is not well at this point. When attempting to pull up another skier, the motor has significant power loss, to the point of not getting up on plane. If I let the motor cool for 1/2 hour, the power is restored. There are no heat alarms or forced shutdowns issued.

History:

I had an overheat alarm 5 years ago and replaced the impeller and thermostat, which fixed the alarm condition.

The peehole is running with good pressure.
I pulled the thermostat and it performs to spec
I pulled the water temp sensor and it performs to spec
I have changed the water fuel seperator
I have changed the external fuel filter

Any ideas?

Mark

[boats.net]

Try a new set of spark plugs, may have a problem with idle control valve.