mpg's towing and codes?

[rjrodriguez]

Well i just got back from vacation yesterday. I traveled a total of 1100 miles pulling a 24 foot weekend warrior toy hauler from new mexico to glamis and back. I averaged anywhere from 9 miles per gallon to a best of 11, just curious if this is normal? Also my truck threw 3 codes, p-0341,p-0647,and p-0336. My air conditioner stopped working when i got to yuma, which sucked really bad considering it was 90 plus outside. Any one know what could have caused this. I do have a power max cr on right now, im thinking this had something to do with the codes. But the a/c im not sure about. The dealer said i needed a reflash, for the 0647 high voltage at ac relay, not sure exactly what that is. What do you guys think??? Right now the truck has about 69,000 miles on it. The truck ran great, no power losses, but the check engine light went on in yuma, and stayed on till i passed tucson on the way back. Almost as if the elevation had something to do with it.

 

[rjrodriguez]

Any help, anyone please.

 

[Prairie Dog]

It's the power max causing at least a couple of those codes. Mine still throws one of those every once in a while, especially when I'm on a long trip for some reason. The CEL will extinguish after 9 starts without the condition recurring. I've had luck with just reseating the TST's plugs a couple of times, after that it wont do it for a long time.

As far as mileage, I get 13. x when I tow 7 to 8K but my 03 gets better mileage than the newer rigs. The TST gets the best mileage towing on level 1 but does better solo on level 2.

BTW, it would be great if you had a signature.



Scotty

 

[rjrodriguez]

Also i just added a 150 gph fass pump, no filters. Will this have any type of impact on my mileage? Its a loud mother f. It sounds like its pumping a lot of fuel.

 

[Prairie Dog]

I've got the FASS 95 and never noticed any difference in the way it ran or in mileage.