CM2250 Poor fuel mileage

[Truckdriven]

(02-08-2022 )Nilao Wrote:  If RunningRough did the tune I doubt it's bad....are the parts you replaced OEM or aftermarket?

You could call RunningRough back and have him adjust your turbo mappings, they could be set too low....most of our tables are based off of OEM coolers and such.

No amount of tweaking a tune can overcome a bad part so I would definitely double check the mechanical side.

I agree with you that you can't tune failed hard parts away. That's why we were hesitant to change the tuning right away plus the fact that this program is in many other trucks with no issues. And yes all parts are genuine OEM cummins or paccar