Need some help. I have a 2002 SR 340 Sundancer with 8.1 v-drives. Sometimes at idle throttle settings the port engine is 100 to 150 RPMs faster than starboard. This just started a month or 2 ago. The starboard engine is always in the normal idle RPM range. The port engine is inconsistent and sometimes (most of time) idles at correct (same as starboard) RPM.
Now this week while in no wake zone and engines at idle speed (port was running correctly) with props engaged the port engine RPMs surged for a second or 2 up to 100 faster. This happened 3 times during this run while returning to the marina. I replace the IAC (Idle Air Controller already, but problem persists. The hose from the IAC to the throttle head is clear.
Anyone have any advice?
