Troy Zeller

I have a 99 2500 cummins an over the last year its been sitting started occationally but recently when I drive its getting 3 to 4mpg even replaced the fuel.
was getting 18-22pmg before I parked it.
any ideas?

AlpineRAM

Do you read the 4 mpg from the overhead console?

Any more smoke? Codes? Low on power?

I'd start by checking the air filter, then the charge air system (boost leaks) and checking for codes.

Troy Zeller

yeah its saying it on the overhead when the overhead is actually reading other than saying occ I believe an it smokes a little white occasionally when I get on it.
granted its not being driven daily anymore.
was getting a code for 3 to 4 shift solenoid
until I took the smarty programmer off

AlpineRAM

OK, the overhead is not really reliable if i has bus problems.. as it says by showing OCC.

Still, I'd start with the air filter, if it is plugged it can lead to high fuel consumption. Also remove the hose from the air filter to the turbo and check for debris, if the turbo spins freely and does not rub .

The solenoid code being cured by removing the smarty is really strange...

Troy Zeller

well awhile back my brakes went out while driving an I had to throw it in 1st at 25mpg to slow the impact of a wreck.
kinda made the computer spaz an stay in 3rd until the programmer was removed

Troy Zeller

I'm getting codes... 1688 internal fuel injection pump controller failure
an 1693 etc cleared in companion jtec module
tubro inlet wheel is tight.
granted its new an only has 5k on it

AlpineRAM

OK, basically it looks like injection pump time to me.. Still I'd go over the bluechip diesel VP44 diagnostics to be sure that you don't throw away a lot of money.