"Just went on a cruise for a f
"Just went on a cruise for a few days. While waiting for a dock assignment, boat at idle (normally around 650 RPM or so), suddenly idle speed went up to 1100 RPM, oscillating from 1000 to 1200 about once per second. Very hard to dock at 5.5 kts.! Engine runs perfectly above 1200 RPM all the way to full throttle, no problem. All perfectly normal until throttle is returned to idle, then the oscillating starts again. Moving throttle slightly higher than idle smooths it out again, but at higher RPM. Recent (about 10-15 hours engine time, and a couple of fuellings ago) oil, oil filter, both fuel filters, air filter all changed, ran perfect until this. No bubbles/water/sediment in Racor. I've added a high-lubricity diesel fuel treatment, but it didn't help.
Is this possibly an injection pump regulator (governor) problem? Anyone have any ideas? Problem came on very suddenly, hasn't gotten better"
"Just went on a cruise for a few days. While waiting for a dock assignment, boat at idle (normally around 650 RPM or so), suddenly idle speed went up to 1100 RPM, oscillating from 1000 to 1200 about once per second. Very hard to dock at 5.5 kts.! Engine runs perfectly above 1200 RPM all the way to full throttle, no problem. All perfectly normal until throttle is returned to idle, then the oscillating starts again. Moving throttle slightly higher than idle smooths it out again, but at higher RPM. Recent (about 10-15 hours engine time, and a couple of fuellings ago) oil, oil filter, both fuel filters, air filter all changed, ran perfect until this. No bubbles/water/sediment in Racor. I've added a high-lubricity diesel fuel treatment, but it didn't help.
Is this possibly an injection pump regulator (governor) problem? Anyone have any ideas? Problem came on very suddenly, hasn't gotten better"