Good afternoon, my fellow Cummins gurus!
I have picked up a very notable vibration in the truck at 1100-1300 rpm.
I have eliminated the possibility of the vibration from the drive train, i.e., transmission, driveshaft, diffs, or wheels.
The vibration occurs when the engine is at 1100-1300 RPM, whether in park, neutral, or everyday driving.
The engine's load has not made a difference as well.
I first noticed it after I towed my trailer and parked it.
I came back a few hours later to drive back home with the trailer, and the vibration was there.
Thinking it could be related to the trailer, I unhooked it and drove around, and it was still there.
I let the truck sit overnight and cold soak, and the following day, I started it up, and the same thing happened.
It does not seem to affect drivability or power.
A few notes: I need to replace the CP3; it has a very high fuel return rate (a very good local diesel shop diagnosed this), which is on the list to get replaced very soon.
I will also install a new set of injectors to replace the CP3.
Is it possible that my new vibration is injector-related?
I have inspected the truck to try and find anything loose or missing, but I cannot find anything.
Any guidance on this would be super helpful.
I hope it is a bad injector or something like that since I will be replacing them in 2 weeks.
130,358 miles on the truck.
I either commute on the hwy or tow my 43ft gooseneck trailer.
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