X15 noise and lack of power on a hard pull.

[Ricky]

(12-25-2019 )Jrloar Wrote:  

(12-25-2019 )tree98 Wrote:  30K mile oil changes, 2.79 rears, and that auto $hitter lugging you down all the time, your engine is being greatly abused. You don't have to believe it but it's a fact.

I listen to everything that I hear. Like I say. I am a mechanic but not specifically Cummins. I came here because you guys run them. I haven’t. There is times I would take the word of drivers over a mechanic. How much does a mechanic drive the engines. And like stated. No load rev is totally different than pulling 80k up a 9% 2 mile grade. Sitting in neutral the engine makes no noise. However if the truck misses a gear and it revs to catch it again I can hear it. It is much snappier when the computer does the rev though

Air compressor? That’s possible I guess. I could unhook the air intake to the compressor and see if the Sound changes. I do have one problem, in my mind it’s valve train noise. So it’s hard for me to look someplace else. However I came here to get thoughts and advice. So I will try the air compressor.

I have a 08 ISX and I have to say sometimes my air compressor is so loud, like it's throwing a rod. It comes and goes, not just when pumping air. And it's really not that old, maybe three years. But it has gotten worse lately. Might put another on by summer. If it fails will it damage the engine???