2024 x15 ticking at 1400 rpm

[marek4792]

Can't hear anything there, but when you do the cut out test do it at the rpm it's ticking at, when you normally cut out a cylinder, it will tick slightly loud enough to catch, and hold it at each cylinder to see if the ticking stays steady or fades in and out or even stops or in your case doesn't change at all. Then do the opposite and cut the other 5 cylinders and see which one will stall the motor or sounds like has another cylinder running with it. Repeat both on the suspected offender.

[JimT]

So if no one has checked the valve adjustment, that would be my first step. It's fairly simple. Also check the jake rockers for proper clearance too. All the service info should be easily available from quickserv.

Edit:

On the flip side, if all emissions systems are intact it's possible the noise is related to an EGR ratio commanded by the ECM. This could explain why it comes and goes sometimes. Not sure how one would diagnose this, but at the very least you could make sure all the sensors and wires are properly physically connected and working/reading correctly (monitor sensor data via insite). This is based on my understanding of EGR changing the characteristics of combustion and therefore the sound, specifically a ticking sound, that you might be hearing. If my understanding here is wrong I welcome correction.

[RickatGL]

Ok I got a better clip of it, I was working on doing some testing, only had a hour spare with engine up to temp, couldn't hear the ticking noise while testing, so trying to pin point the issue was useless. I uploaded another video, it isn't great as the noise doesn't hang around to be recorded it seems. Previously past 5 minutes the ticking/knocking was going on and loud for 3/4 mile, now reduced to what you hear in the clip. https://youtu.be/wQy7tC_J4kY?si=dLVQPiAQh5XHUDIX

[schISM]

The ticking in the latest video you posted is normal for this engine. I have a similar spec. 2025 605/2050 that does the exact same thing. First time I drove it I thought it sounded pretty "cobby". The only thing I can attribute it to is the aggressive timing cummins is using in the 2450's vs. what the 2350 X15 used. Light throttle and nearly 10+ degrees btdc (for egr compensation) on a warmed up engine is gonna make it rattle. Just run it.

[RickatGL]

And yours sounds very one cylinderish, very tak tak tak as you slowly drive. I'm not talking about all the noise, just this noise from 16-18 seconds. Seems, not normal?