Rum, rum, rum@ 3,500 RPM
My E450 with V10 has a slight surging of RPMs at 3,500 and climbiing hills. Normal or something out of balance? New 8 months old 2015 chassis.
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I don't see any movement on the tach, but the engine whine at 3,500 RPM has a slight up and down. Not a harmonic vibration. You know how the generator can surge, it's like that but not as much
