Dpf cleaned and mileage dropped 1 mpg

[bossboy2]

(05-08-2018 )Trucker750 Wrote:  

(05-08-2018 )Rawze Wrote:  There are a lot of causes for fuel mileage dropping. Simply cleaning the DPF properly is not one of them. Something else caused it. Perhaps they worked on something else or replaced a sensor with a defective one?. Maybe a leaky doser injector?

Is it possible that a clogged intake system could account for the instant drop of 1 mpg just because the dpf was cleaned? Maybe the egr valve is so clogged it can't open normally, and the change is exhaust backpressure is now requiring more or less flow that the clogs will allow, equaling lost mpg? All without throwing codes? I'm a mechanic as well as a driver, but the computer systems nowadays are new to me.

Yes, it is possible. Earlier this month a forum member here asked about my oil sample and why the soot level was so low. That got me thinking perhaps it was clogged somewhere and no exhaust gas was coming thru the EGR system. I opened it up and found the venturi port clogged so tight it took a pic to get it open. I cleaned up the delta-p and the IMAP sensor. I didn't see any difference in mileage. About two weeks later I replaced them both due to a recommendation by someone on this forum. Last week I had the best fuel mileage ever. 9.1mpg. Prior to that I was at 8.2 mpg. Take it apart and change the sensors.