On two separate occasions my '08 SD has tripped off the cruise control, lost power and started bucking like a mule. It wouldn't accelerate over 40mph regardless of throttle position. The boost guage would rise slightly and then drop rapidly with the power loss, but no check engine lights would trip. The truck has 40k on it, had plenty of fresh fuel, is up to date on filters & maintenance, had Ford cetane booster in it, etc. After nursing it to a safe spot I shut the engine off and restarted it and the problem was gone and hasn't returned again. It coincidently happenend while heading in to a stiff head wind. My area dealerships have no clue, but are more than happy to check it out (drive it down the road at a price of $85.00 / hour) in the attemot to duplicate it. Any suggestions? I have better things to spend money on.

 

i dont have any idea what it could be do you still have the dpf on it

 

yes. There have been no modifications madde to it. It is still stock.

 

Going thru the exact same thing right now - Ford Customer Service told me 2 different times that it is 'normal operating characteristics'. One of them even told me its going to get worse the more miles I put on it. Somebody posted a bulletin sent out by Ford on here somewhere (I will see if I can find it for you). Mine was in the shop from the middle of sept to around Christmas time. They could not duplicate the problem. The powerstroke has a 100,000 mile warranty so you shouldn't be paying them to look at it. I'm in the process of getting them to buy mine back. Good luck to ya. I will be watching for updates.

 

I just received a service program number 08B07 that may fix this. My truck's display has never indicated when the DPF is regenerating. It is regarding a reprogram of the PCM, TCM, and the instrument cluster to to indicate when the filter regenerates and hopefully may reprogram or calibrate the engine to run right. We will see when I finally can get by without it long enough to take it in. Like the rest duplicating the problem is the hard part. I make my living in this truck and leaving it for them to drive home and back, to lunch etc for a long time is not an option for me.

 

HI markjc, Keep us informed of what FORD does or doesn't do with your truck ??

 

sorry to say but, you have an 08 and a 6.4, alot working against you, though it is a very powerful truck, it has many flaws from the dealer (i.e. the torch kit because of the super heated cleaning cycle). i also have a ford and understand how difficult it can be ( like my oil dip stick cracking off in the tube every 10k miles). the only way to get anything done with them is to bitch continually.and eventually they will just fix the problem because they know it isn't worth the fight. tell you the truth it sounds like a limp mode issue, for some reason the truck thinks it is in danger and goes in to the safe operating speed (thank you computers) and that would explain the 40 mph regardless of throttle position and the bucking is what is sending it into safety mode. it isn't your tranny cause you can drive like you stole it once the problem is cleared, so it is electrical, which means some thing is wrong with the soft wear or something electrically is jumping in the harness. thats all i can think of with it, but if you get on ford when they have your truck they tend to fix problems more permanently.

 

I got the reprogramming done according to 08B07. It drove fine for about 24 hours and then did the same thing over again. This time it was extremely cold, but I always keep Ford antigel and cetane additive in the tank. The engine lost power on the highway again and after milking 25 miles back to the dealership they tried to blame it on fuel gelling. I told them that I wanted the refund of the additive that doesn't work if that was the case because another guy was checking his truck in with the same symptom, but his was dieing.

Long story short after they replaced my fuel filters again (which they admitted were not gelled up) they confirmed that the fuel pump had failed and was not supplying enough pressure at highway speeds. I am currently waiting for the part to be installed tomorrow. I will update after roadtests.

 

HI Mark jc, So far my 2008 F-250 6.4 hasn't given me any problems, but I only have 3,909 miles, A fuel-pump shouldn't crap-out in 40,000 miles. KEEP US IN TOUCH,THANKS !!

 

man I am sorry to hear your truck is acting up I hope that fixes it for you I am praying I dont have any problems with my 6.4 I have had bad luck with my other diesels