Why is my fuel milage so bad?
#1
Why is my fuel milage so bad?
I am only getting around 14-15 in my truck. I am going to change the engine oil and I want to change the differential and transmission oil but I need a new job first. Anyways, is there maybe some other reason that Im getting bad milage? I put a new CP3 which was what my check engine light was on for and my diesel mechanic said it should fix my problem if I got a new one but even after I replaced it the check engine light is still on. I took it to autozone and they ran the scan tool. It said the truck passed but the light is still on. Do I need to run a different kind of scan tool on it? What could be my problem? Thanks guys.
#2
What was wrong with the CP3 that it took a crap? Whens the last time you changed the fuel filter or clean the air filter? Are you runnin any type of programer/chip? Auto or man? Are you hand calculating the milage or lookin at the overhead monitor? Also is the speedo recalibrated for the larger tires? Lotsa possiblities...
#3
What was wrong with the CP3 that it took a crap? Whens the last time you changed the fuel filter or clean the air filter? Are you runnin any type of programer/chip? Auto or man? Are you hand calculating the milage or lookin at the overhead monitor? Also is the speedo recalibrated for the larger tires? Lotsa possiblities...
#4
#6
The gears are fine, you just need to get your speedo recalibrated. Dealer might be able to help, mine wouldn't. I just reprogramed mine with my Smarty. Because with the speedo being 5mph off the trucks mileage is showing less than you actually traveled hence bad fuel mileage calculations.
#7
#8
I wish I were closer.. I have a Smarty!
I feel your pain... I have the exact same problems with mine! If one of us ever figures out what it is we will have to make sure to tell the other!
Look in your glove box for a label that has your gear ratio on it. Or you can go here and see where your rpm is on the chart for the equipment your truck has. You can even change tire size to a different value to re-figure the rpm!
klenger.net
To be honest the only thing I haven't checked on mine is the intake system for leaks (Under boost). I started buying the 'tools' to check it and never finished. Guess I better get that done.
Let me know if you find anything or if you have more questions.
HTH,
(Check around, you may find a dealer that will do adjust the speedo for you! There are some good ones still out there!)
I feel your pain... I have the exact same problems with mine! If one of us ever figures out what it is we will have to make sure to tell the other!
Look in your glove box for a label that has your gear ratio on it. Or you can go here and see where your rpm is on the chart for the equipment your truck has. You can even change tire size to a different value to re-figure the rpm!
klenger.net
To be honest the only thing I haven't checked on mine is the intake system for leaks (Under boost). I started buying the 'tools' to check it and never finished. Guess I better get that done.
Let me know if you find anything or if you have more questions.
HTH,
(Check around, you may find a dealer that will do adjust the speedo for you! There are some good ones still out there!)
#9
some of our more "advanced" genral garages in our area are able to refigure for larger tires. i put a little bigger tires then stock on my new chevy, and the garage that did it, changed it right away, with out even askin me. and he was some backyard mechanic, with a really big barn for a shop.
#10