Hi guys,
I have a problem that follows me for a while now
I got a 2017 Cascadia dd15 dt12 900k mi
At certain rpm, and they are different from gear to gear the engine, or at least it fills like engine, vibrates badly almost like I was driving on a rumble strip on a side of the highway.
It shows up the most on 9th gear at 1100rpm and 10th gear at 1000 rpm. If I accelerate a bit or lift my foot (+100, -100 rpm) it disappears right away. It is also present on other gears.
Does not matter of a load weight
There no vibration when the truck is cold. After a few minutes it starts to appear and fully shows after a few hours of truck working.
I had that since I bought the truck 500k mi. Usually it appeared after long idle, long empty drive or dpf system issues.
I thought it was related to dpf filters. Like they ware getting clogged or so. Because after I drove loaded for a while it disappeared.
But a few weeks ago I got checks on my dash. It wasn’t far away from home and driving back I noticed the same kind of vibration.
Ended up I changed the whole scr box. But the vibration stays all the time for a few weeks now.
No one knows what is that.
I afraid it may damage the engine
I’ll be grateful for any suggestions
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