2011 MP8 Engine Vibration

[marq16]

Have a vibration on 2011 MP8 engine. Mechanic changed solenoid on air intake. Still vibrates. Mechanic told me to back off accelerator and get back on it hard and it should stop. Sometimes it did stop, sometimes it didn't. Anyone know why?

Edited January 23, 2016 by marq16

[220cummins]

Were the injectors checked for aeration, balance, and compression? Some have complained of engine/driveline vibration in the MP's and its the injectors. I test drove a Volvo with the D13 (mp8) that had a bad vibration and miss. Diagnosed injectors and when removed them found two had the tips broken off. No MIL or codes were present.

[wheeler73]

I have seen the injectors cause the issue on more than a couple.

[Mackpro]

Another vote for Injectors. Putting a set in now as we speak.

[bbigrig]

Injectors or cups putting combustion gas into fuel system. So common on Macks and Volvo's it's not even funny.

[c-mac]

Injectors, also check for bubbles in the fuel tank while running

 

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[Keffer inc]

Does your truck run good until 1400 rpm and then act dumb? Mine does thta. The dealer said I have an exhaust manifold leak (powers the turbo) and also had a broken stud and broke O-ring on the intake side. They're fixing it now so well see the price damage then I guess. I think I'm looking at $1,500 for the repairs.

[1965]

Injectors!!

[DSCannon]

We've also seen with the engine brake rockers releasing pressure and creating vibration. Make sure it's clear there is no brake interaction before spending time on injectors.