Hey guys I've done a ton a searching on this but I havent come up with a solid answer yet, maybe someone here can help me. For past week or so I've been experience an extremely rough idle in my truck. Once its been run for a few miles and everything comes up to temp and I come to a stop light the problem starts. It'll get a real rough idle and the engine sounds completely different. Once I start driving again I get up to about 5lbs of boost, the truck starts sputtering/missing (for lack of a better term) and won't accelerate or want to get above the 5lbs. I can barely get into the throttle without the truck shaking and missing/sputtering. The engine light isn't on, I've run a scanner and there aren't any codes flashing. The problem is also random, one day it runs fine, the next the problem returns. Without any codes or consistency with the problem I'm not sure where to begin. I did change out the fuel filters ahead of schedule and drained the water separator but the problem is still there. Any ideas?

 

Thats crazy that you don't have any codes.

 

Not a one, the scan can up clean and the "message center" in the truck hasn't said anything either. According to all the electronics the truck is apparently running great....

 

What type of scanner? When is the last time you changed your fuel filters?

I am thinking this is EGR related or fuel/fuel filter related?

 

Just changed the fuel filters a week ago and primed the system has to Fords instructions. I can't remember the brand of the scanner, I borrowed it from work, it was your typical OBD diagnostic scanner. I can get the brand name later today.

 

Subscribing

 

I'm having a similar issue with my 09 F250. Randomly when I stomp on the gas, the turbo goes to 1.2 lbs and stays put. The engine sputters, bucks and does not accelerate. I have also notices the cruise control does not work when the truck acts up. The first time it happened I was trying to merge on the highway and had to pull over to keep from being hit. I turned the truck off and on again and the problem was gone. Took it to the dealer, no codes, no errors, no indication anything had happened. It has done the same thing 10 times since then and no improvement. The dealer can't find anything wrong with it. Ford corporate basically dared me to try to take action with them. Lemon law won't work because you need a diagnosis that can't be repaired (in NH) so until I have a diagnosis, I'm the guy that brings my truck in every month with no problems.

Since I can't force it to repeat, I'm going to try writing letters to Ford explaining that I have a safety issue and see what they say.

 

Is your maintance up to date?

 

Well I found the cause of the problem...EGR gave out. Dealer says 2 cylinders a low on compression, coolant is pouring into the cylinders and there is evidence of hydrolocking. I'm told the truck needs a new engine that unsurprisingly my warranty is not covering. Figured I wouldn't leave this thread hanging and update it for anyone running a search with similar symptoms.

 

As I suspected. Are you over the 5 years/100K mark on warranty?

 

This is exactly what happened to my truck...only 50k, so it was still under warranty and at this time still in the shop...#2 & #8. It has been a month, still trying to get it right

 

how often does this happen, tomorrow I am trading my 7.3 for a 2009 w/ 99xxx on the clock?

 

EGR cooler issues are actually rather rare on the 6.4.

 

well that is good news, hate to get rid of the old 7.3 but all good things must come to a end.

 

I have had a 7.3, a 6.0 and i wouldn't look back from my 6.4.......tune it and drive it!