Cummins600

Not a big deal, but I some times notice a kind of vibration from the fuel pedal while slowly accelerating. Seems to happen while shifting from first to second. Anyone else notice this or have a theory as to why?

spots

I take my foot off the fuel pedal when I shift from first to second. No vibration here.

bulabula

Don't have it here, but I seem to remember some folks reporting the same vib - its been awhile. Can't remember what came out of it.

NJMurvin

Watch your tach next time and see if this occurs at about 2000rpm. I still think there's a 2000rpm issue with this drivetrain. I feel this vibe also - plus I feel some vibe at idle. I also think the 2000rpm vibe might contribute to the 70mph vibe that folks are noticing (myself included), because (for me, anyway) that's the rpm at around that speed. I noticed this morning, running with the AC off seemed to lessen the vibe in all cases. I assume there's less load on the engine with the compressor off. Just an observation.

Neil

Cummins600

This only last about two seconds and the RPM’s are about 1,300 under light acceleration. Other than that everything seems very smooth.

blownaway

I also noticed it is not as bad with the A/C off, I just drive with the cruise on all the time, Foot not on pedal, No vibes