Major Trouble...
#11
If it is the fuel (this is possible) change the fuel filter(s) and drain the tank. The absolute number 1 problem with the new trucks is poor fuel quality. You must use a quality fuel that is ULSD or you will be in trouble. Your fuel add's will only fix so much.
Where abouts are you located?
Chevron fuel is ALL we use along with the odd gulp of PS.
Where abouts are you located?
Chevron fuel is ALL we use along with the odd gulp of PS.
#12
Yes. You have them in AB too (just only commercial fuelling I think).
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What colour is the smoke? Is it when cold or when sitting or what? You really need a fuel pressure gauge on there to determine if the lift pump in the tank is working the way it was intended (notice I didn't say designed!). Get the dealer to run a complete scan and have them tell you what the fuel pressure is at the CP3 injection pump. Also, have them drop the tank, inspect for debris and inspect or remove the screen on the bottom of the draw tube on the lift pump.
This is why most of us don't have OEM lift pumps - they suck. Have them remove the OEM filter canister and inspect for debris as well as if the WIF (water in fuel) and FH (fuel heater) sensor is working correctly. Next and very unlikely is to check the drain port on the OEM filter cannister and make sure that the oring is not damaged in some way as this will suck air into the system at this point causing all kinds of neato problems with your CP3 pump.
Everything else I can think of would have or should have set off a CEL (or CWL - check wallet light for those of us without any warranty!).
Good luck.
---AutoMerged DoublePost---
What colour is the smoke? Is it when cold or when sitting or what? You really need a fuel pressure gauge on there to determine if the lift pump in the tank is working the way it was intended (notice I didn't say designed!). Get the dealer to run a complete scan and have them tell you what the fuel pressure is at the CP3 injection pump. Also, have them drop the tank, inspect for debris and inspect or remove the screen on the bottom of the draw tube on the lift pump.
This is why most of us don't have OEM lift pumps - they suck. Have them remove the OEM filter canister and inspect for debris as well as if the WIF (water in fuel) and FH (fuel heater) sensor is working correctly. Next and very unlikely is to check the drain port on the OEM filter cannister and make sure that the oring is not damaged in some way as this will suck air into the system at this point causing all kinds of neato problems with your CP3 pump.
Everything else I can think of would have or should have set off a CEL (or CWL - check wallet light for those of us without any warranty!).
Good luck.
Last edited by Wyatt Earp; 02-21-2008 at 03:18 PM. Reason: Automerged Doublepost
#15
#16
#17
It might be your turbo is clogged up. I know it sounds crazy but i have an 07 6.7L that was having the same problems took it to the dealership and they took it apart and cleaned it out. Never had one light or message to come on either. Just somethin to check into cause I thought the same thing at first bad fuel,bad sensors,electronics,etc. But it was the turbo was clogged up.
#18
#20
I have a 2007.5 cummins 6.7 ive got 42,000 miles on it and some were tough miles, i added the edge with attitude at about 20,000 never had any regen problems and truck runs smooth, ive let it idle for hours at a time never any check engine lights, it most likely the egr
Last edited by highstyle; 07-29-2008 at 03:04 PM.