CHPMustang
Senior Member
Ever since this past September the mileage on our 7.3L Excursion has gradually dropped dropped and dropped to about 12 MPG which we have never seen before since we took delivery of our Excursion brand new.We're accustomed to filling once a month to where we're down to every 2-3 weeks but we knew something was definitely going on and we had to resolve this before it went any further.-popcorn
Since around October the injector noise and an unusual sound in cylinder detonation has been on the increase so I did the standard procedures of adjusting fuel pressure,modifying additive amounts/cocktails added to fuel,changing the 6637 filter,adjusting programming,changed the oil early(5,000 miles),checking Ambient and Charge air sensors that they're intact and clean,no boost leaks,kept the fuel level in the tank full,changing fuel suppliers,so on and so forth,yadda yadda yadda.
I had come to my wits end along with my poor wife worn of me constantly analyzing this and that with the truck I was getting close to cutting the Excursion loose but last week after discussing at length with Dennis at ITP about the increased injector and detonation noise I decided to eliminate the new high tech 15PPM ULSD fuel altogether and fill the truck with B20 BioDiesel.
Sunday morning I cruised to one of the DFW B20 stations(21 miles away) and topped off the tank with 22 gallons since I had more than a half tank to start with but this had to be done.
On the ride back to Richardson I wasn't 2-3 miles down the road on Irving Blvd as I clearly noticed the injector noise reducing,engine vibration reducing,turbo whistle increasing,shift points lowering and everything pretty much associated with an engine running higher quality fuel.:tu:
The results in my case is the new ULSD 15PPM Diesel Fuel is to blame for the ULSD has virtually no lubricating properties for the 7.3L Diesel Engine to properly run and perform as designed back in the 1990's.
I will continue to use only B20 Diesel Fuel and when available On Highway LSD 500PPM Diesel Fuel.
Off my soapbox thanks for listening
CHP
Since around October the injector noise and an unusual sound in cylinder detonation has been on the increase so I did the standard procedures of adjusting fuel pressure,modifying additive amounts/cocktails added to fuel,changing the 6637 filter,adjusting programming,changed the oil early(5,000 miles),checking Ambient and Charge air sensors that they're intact and clean,no boost leaks,kept the fuel level in the tank full,changing fuel suppliers,so on and so forth,yadda yadda yadda.
I had come to my wits end along with my poor wife worn of me constantly analyzing this and that with the truck I was getting close to cutting the Excursion loose but last week after discussing at length with Dennis at ITP about the increased injector and detonation noise I decided to eliminate the new high tech 15PPM ULSD fuel altogether and fill the truck with B20 BioDiesel.
Sunday morning I cruised to one of the DFW B20 stations(21 miles away) and topped off the tank with 22 gallons since I had more than a half tank to start with but this had to be done.
On the ride back to Richardson I wasn't 2-3 miles down the road on Irving Blvd as I clearly noticed the injector noise reducing,engine vibration reducing,turbo whistle increasing,shift points lowering and everything pretty much associated with an engine running higher quality fuel.:tu:
The results in my case is the new ULSD 15PPM Diesel Fuel is to blame for the ULSD has virtually no lubricating properties for the 7.3L Diesel Engine to properly run and perform as designed back in the 1990's.
I will continue to use only B20 Diesel Fuel and when available On Highway LSD 500PPM Diesel Fuel.
Off my soapbox thanks for listening
CHP
