I from time to time have felt a hesitation in accerating in my 2011 diesel. It is like the engine cuts out for 1/2 a second. It is very random and not that often, but it does do it. Does anyone one else have this problem

 

Yes mine does it, I think it's normal turbo lag......I don't like it, but I don't think there is much we can do about it.

 

I have the same thing... very random

2011 F250 6.7L SC

 

I brake with my left foot and found that to be the problem. The truck is programmed so that the brake wins if the throttle and brake are pressed at the same time. I found that I had my left foot just touching the pedal at times. Particularly in traffic. Every time it happened the engine acted like it hesitated. You might watch for this and see if you are doing what I was.
Shupe Holmberg

 

I while back I started a thread named "dead throttle/unresponsive accelerator."

You can find it with a search using those four words.

There were quite a number of responses that you might find helpful.

Why not take a look to determine if this is the same issue you have been experiencing? Thanks

 

I don't know if the brake over throttle thing is in effect at all times. I use both when I'm backing up my steep driveway every day, admittedly at low speeds. I've also used this technique when one wheel was in the mud to slow that spin and move the power to the wheel(s) with traction - which is a four wheeling trick. What I don't know about is whether there is a speed limit on that behavior.

 

The limit seems to be around 10 MPH but I don't know the exact number.
Above that speed and the computer will cut power to the engine after two seconds of braking and acclerating at the same time.

 

My truck does this when its cold - starting out in the morning. I let the truck warm up for a couple minutes before I head out the door, unless its below freezing/frosty then I'll let it run for about 10-15 minutes. When I hit the road it always is "jerky".

 

I normally use just my right foot for both the brake and accelerator. After reading this I had to try it. Yesterday I took the truck out and gradually accelerated from a dead stop. At about 20mph I gently applied the brake with my left foot while still depressing the accelerator pedal. The truck continued to accelerate for about 1 second, after which the engine RPM abruptly dropped to near-idle (I'm guessing the 1-second delay is for in case you accidentally bump the brake pedal). After the RPMs dropped out they would not go back up no matter how hard I pressed the accelerator pedal.

So yes, it does appear that in a contest between the brakes and the accelerator, the brakes win, which makes sense of course!

-Carl

 

My '12 6.7 is doing this...but ONLY starting from a stop and ONLY at high elevation (above 8500'). Once moving, no problem. 2 footed, 1 footed, power brake, no difference. (as in, it won't power brake, won't build boost at all).

My 2002 7.3 did not do this. I was routinely at high elevation, we had a cabin. I just bought this truck last spring, and since I don't have my cabin anymore, have only been above 8000' twice and it did it both times. Once was on switchbacks, I had to put it in 4low so that it would even move at idle. Turning off traction control didn't help. Neither did whatever gets turned off when you hold down the traction control button for a while. 4hi didn't help, the tires weren't in any danger of spinning.