2014 isx vibration

[Marajin]

(03-07-2016 )race7820000 Wrote:  cummins said there is no way to manually adjust the timing on a newer isx like mine and that the ecm was updated last time it was in there.

This injection timing is electronic on that model engine, but the valve timing of that engine is done via the "wedge kit" to the valve cam. It does have the possibility of slippage and it is a well known isx issue.

(03-07-2016 )race7820000 Wrote:  not sure, there is no gauge that shows boost or temps.

CM2350 engines have a lot higher compression ratio than older CM871 engines do. It is very new to cummins ISX engines to have compression ratios that high. High compression ratio also makes the engine a lot more sensitive to excess boost issues and vibration can set in fast in that rpm range on them because of it.

No boost & pyro gauge is fine for a company truck where the driver does not care about anything but how fast he can go, but as a truck owner, it is like driving blind. You will never know what your truck is actually doing. You can't tell if you are having a fuel mileage issue, or low/excess boost problems, or if your turbo/exhaust is overheating. Excess boost can tear an engine apart with vibration and destroy components, and it almost always happens in exactly the rpm range your describing.

I am not saying that is your problem, but you cannot rule it out as a very strong possibility until you get some real measurement of boost pressure when it is happening.

Someone posted this pic on the old forum a long time ago. It is what the result of some excess vibration due to boost problems. In their case though, it was bad programming.

Tags:

isx wedge kit, wedge kit, timing wedges, isx wedges, static timing, static wedge kit