Recent Lack of Power - Port Engine

jaywoodz

Member
Nov 12, 2012
522
Richmond, Virginia
Boat Info
1999 Sea Ray 310 Sundancer
Engines
Twin 350 MAG MPI Horizon w/V-Drives
Recently, the past 2/3 times I've gone out, I can't get my port engine above 3,800 RPM. My starboard engine however, easily hits 4,300 - 4,400 RPM. The throttle levers are like night and day. If I drop the starboard engine, the port engine slightly drops. It seems as if it has an issue.

In the past, I had a prop issue that caused this, but there's no vibration, and to my knowledge, I haven't hit anything in the water. Is there any DIY stuff I can check to see why I have such lack of power?

Thanks.
 
Other considerations are IAC (Idle Air Controller), unlikely, MAP Sensor (Manifold Air Pressure), maybe, and TPS Sensor (Throttle Position Sensor), maybe. They are all easy to get to, but I would try to get a scanner on it, or make a code tool to see if you have any service codes set.
 

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