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Posting this story because I’ve searched the same issues and found that many have had the same issues, although never posted the solution. It seems that they figured it out and went on their way.
I hope this helps someone so they don’t waste the time and money we did.
the last few trips to the islands, our pair of 670hp QSM11’s ran great, although the starboard engine lagged on run up behind the port by sometimes 800+ RPM. After consulting with many technicians and countless hours of research, we decided that it had to be a turbo issue as the wheel had slight resistance. Please note we were getting boost pressure readings on both engines. <br /><br />
Side note: We had also had issues with the Glendinning electronic controls, kicking into a system alarm which forced it to idle/neutral state. After being left stranded on the Bahama bank once (had to lock trans in forward to get back to the dock) and again coming into Haulover inlet (thankfully we got the hook stuck before we got to the rocks and got a tow into the marina). After consulting with the manufacturer, we determined that the cable ends fail over time and caused the system to lose connectivity. We replaced the cables and solved the problems with that. Although this caused the system to be suspect when having the run up issue, which is why I added to the story. <br /><br />
Back to original issue, we decided to pull the turbo and have it serviced to find out everything was working correctly and definitely within tolerance by a very reputable turbo technician. We put the engine back together to find the same issues existed. No smoke or anything just lagging during run up, once both engines made it to cruise rpm everything worked great. Our Cummins tech suggested that it may be an intermittent boost sensor issue, so we decided to swap the sensor with the port engine and the problem moved with the sensor. <br /><br />
So long story short!! If you’re having issues and can’t find a smoking gun, check your electrical sensors and have a Cummins tech scan with a computer to diagnose. May save you money, days of labor and many foul words.
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