6.0L Power Stroke Engine and DrivetrainDiscussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super-Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.
2004 6.0 F250 4WD. Truck surges all the time except at idle. Doesn't matter if cold or hot, pedal on floor or not this thing surges. It is very consistant and has caused mileage to go down to 11 mpg (My 04 King Ranch got 16.8).
Had 2 techs look at it, one diesel mech and other mech at stealership. Both hooked computers up and both say "I don't know". Both say "everything" is checking good ie: injectors, boost, all pressures etc. (Basically all electronics)
Dealer mech says oil temp a little high but ok. COULD NOT control EGR valve with computer. COULD control turbo and other things but not EGR valve. Said was opening and closing very erradict and can't figure out why. Changed EGR valve and NO difference, Unplugged it and NO difference. Changed fuel filters, NO difference. When I changed ER valve, fair amount of carbon in intake but nothing major. Had to clean valve once in the past due to large chunks of carbon holding valve open. Seems truck ran better back then (8 months ago) but has gradually gotten worse. I'm somewhat mechanically inclined but not to this extent. Both want me to leave it with them so they can "figure it out" but I don't have that kind of $$$$$$$$$$ Any suggestions??????????
2004 6.0 F250 4WD. Truck surges all the time except at idle. Doesn't matter if cold or hot, pedal on floor or not this thing surges. It is very consistant and has caused mileage to go down to 11 mpg (My 04 King Ranch got 16.8).
Had 2 techs look at it, one diesel mech and other mech at stealership. Both hooked computers up and both say "I don't know". Both say "everything" is checking good ie: injectors, boost, all pressures etc. (Basically all electronics)
Dealer mech says oil temp a little high but ok. COULD NOT control EGR valve with computer. COULD control turbo and other things but not EGR valve. Said was opening and closing very erradict and can't figure out why. Changed EGR valve and NO difference, Unplugged it and NO difference. Changed fuel filters, NO difference. When I changed ER valve, fair amount of carbon in intake but nothing major. Had to clean valve once in the past due to large chunks of carbon holding valve open. Seems truck ran better back then (8 months ago) but has gradually gotten worse. I'm somewhat mechanically inclined but not to this extent. Both want me to leave it with them so they can "figure it out" but I don't have that kind of $$$$$$$$$$ Any suggestions??????????
Most likley suspect to me is still the EGR valve. I'd replace it with a new one (not clean it), but I'd also do every thing I could to clean out the intake port it sits in. Another candidate is your oil - if its over full, it can froth up & cause a surging situation. Not as common as the EGR, but still can happen.
OMC
__________________
Feb 03 6.0 Silver F-250 SD SC XLT long box, 6-spd 3.73ls, Fx4, Stock, Spray-in liner, Contico box.HARPOONED.
Did change valve. What's the best way to clean out the port where it sits. If I'm not mistaken that is the intake and it also connects to the EGR cooler and such. If the carbon is heavy is there a cleaner that can be sprayed in there without causing damage. If not, how do I clean it without taking everything apart and using a vat or something. If I go that far I'll just replace everything while I'm in there (EGR cooler, oil cooler). 6.0 is worst I've ever had, just wish my 02 7.3 was crew cab not extended.
This still sounds like an EGR system issue to me, which is controlled by a number of sensors. Were there any codes when they had the scanner hooked up? Are you sure the installed EGR valve is good. As I recall reading on here, there were some issues with valves manufactured last spring being bad. I doubt this anything to do with whatever soot is in your intake.
__________________
2004 F-350 Lariat, Supercab 4X4 FX4, DRW
Dark Toreador Red/Silver, 6.0L, Torqueshift Auto, ESOF, 4.10 LS, Camper Package, Dual Alternators. Build Date 6-8-04, Eng 5-28-04, Lance 9.5 Ft Camper.
Valve was good but have ordered new one to make sure. No codes other than when I unplugged valve to see if it changed anything (no difference). Cleaned IAT#2 and no difference. Tech is stumped as well. And yes EGR valves were bad, told dealers to pull all on shelf. Was told to only use ones with pink dot and silver dot on top, this is newest valve.
Last edited by airpig95 : 08-07-2008 at 12:07 AM.
Reason: Added more
I had a 2003 F350 that did the same thing to me. Ford tried numerous times to fix it but never got it right. I finally took Ford to arbirtration and won based on a safety issue covered under the 5yr 100,000 mile motor warrenty. Good luck.
My friends '04 had similar problem, but less consistent than yours. Recently he lost all power and for some reason they said it was his alternator. But in the meantime they found bad wiring in the main wiring harness. Rewired that at the same time as replacing alternator, runs the best it ever has. I saw somewhere that some of the '04's came with bad '03 engines and I believe there is a class action about that.
this will sound retarded but check the oil level. if your even a couple quarts low it will run like a bag of crap. would explain high oil temp. im assuming you and the techtards checked this though...........
AutoForums.com is the premier network of enthusiast-owned
enthusiast-operated automotive communities.
We operate more than 100 automotive forums where our users consult peers for shopping information and advice, and share
experiences and opinions as a community.
Surging---all The Time
Linear Mode
