Vehicle experienced hesitation when trying to accelerate. Vehicle experiences jerkiness and at times complete power loss when trying to accelerate. Vehicle lurches and hesitates when trying to maintain speed going up hills, or when trying to accelerate like when passing a car or on an interstate on ramp. Issues have been reported to Ford numerous times over past 2yrs, several various excuses provided and an occasional 'attempt' at fixing, with no remedy. Most recent event (Sep 2013) involved a near crash due to vehicle rapidly losing power in busy traffic. Other incidents in the past have included stalling in the middle of an intersection when trying to accelerate from a full stop and nearly losing control when pulling a boat/trailer and the vehicle began to lurch/jerk when going up hills.

- Van Meter, IA, USA

The contact owns a 2011 Ford F-150. The contact stated that while driving approximately 65 mph, the vehicle decelerated and began to vibrate. The vehicle was maneuvered to the side of the road where the engine was turned off. Upon restarting, the vehicle resumed normally. The failure recurred twice. In addition, the vehicle would only accelerate at low speeds even though pressure was applied to the accelerator pedal. The vehicle was taken to an authorized dealer for diagnosis. The technician reprogrammed the computer system and installed a heat shield. In addition, there was a build up of moisture in the intercooler. The failure persisted after the repairs. The dealer was unable to provide a remedy. The manufacturer was notified of the problem. The approximate failure mileage was 500.

- Sanford, NC, USA

Attempts to accelerate to passing speed resulted in severe engine sputter and bog down. Failed to accelerate and continued sputtering for several miles to follow. This occurred twice during the same (approximately 8 hr) trip at highway speeds, during rainy conditions. The second time occurring on a long stretch of 2 lane road causing me to have to re-enter my lane with other traffic already moving up to pass behind me.

- Houston, TX, USA

Truck frequently goes into limp mode/stalls. This has happened at various speeds, times, terrain, etc all over the country both with and without our camper attached and both with and without tow-haul engaged. I've taken it to the dealer numerous times and each time they've updated the software according to some tsb that's been released. I've had the deflector put on, cam changed, and now they're replacing the throttle body.

- Livonia, MI, USA

The contact owns a 2011 Ford F-150 ecoboost. The contact stated while driving 65 mph, the accelerator failed to respond to several attempts to accelerate with no warnings. The vehicle was taken to the dealer for diagnostic testing. The mechanic stated that a deflector needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was 23,389.

- Kingsville, TX, USA

Engine misses at times of hard acceleration. Engine ecoboost.

- Gravette, AR, USA

On several occasions and more frequently as of lately, I am losing acceleration capability when I am trying to accelerate at any speed. When I try to accelerate from a stop or uphill, I feel like the engine won't go or is bogging down. To try and compensate, I try to accelerate more which only seems to make the problem worse. I have already taken it to the Ford dealer and they replaced a part on the transmission, but the problem still persists and is only get more frequent.

- Prescott, AZ, USA

While speeding up from a service road to merge into traffic on an express way at approximately 55-60 mph, my vehicle suddenly accelerated to 80+ mph in a matter of second. I hit the brakes and the vehicle briefly decrease speed to about 70 mph but as soon as I release the brake it quickly accelerated to 80+ mph again. I attempted to brake a second time but the vehicle reacted the same way. I then shifted the gear into neutral and hit the brake and exit the express way. The vehicle started to slow down but the engine idle was still extremely high and the accelerator depress almost to the floor. I pumped the accelerator until the idle reduce to normal. When I finally came to a stop, I turned the vehicle off and got out and my brakes were extremely hot and smoking. I looked under the hood but couldn't see anything that indicated a problem. After about 5 minutes I started the vehicle up and drove directly to the Ford dealership (woody anderson Ford, huntsville, Alabama). Ford Motor Company case# cas3080877

- Harvest, AL, USA

The motor stumbles when passing people on the highways or at any type of strong acceleration. This problem has been ongoing and there are records at the seekins Ford dealership here in fairbanks, Alaska. I have brought it in more than once, but they have failed to fix the problem.

- Fairbanks, AK, USA

On I-20 East headed to augusta, ga from Alabama I pulled into the left lane to pass and the engine starts sputtering, skipping and lost almost all power. It happened 3 times yesterday. It was in a light rain and since there was light traffic I was able to slow down and get the engine to recover each time. This could be a real danger in heavy traffic. I tested it again this morning (08/18) and if you try to accelerate quickly it just about shuts down until you let off.

- North Augusta, SC, USA

Went on a 350 mile trip, I was at a stop light and when I went to accelerate the truck lost all power. I have one of the ecoboost engines. The engine did fix itself and I continued with no other problem, this is the first time I experienced this problem. 2011 Ford F150 king ranch.

- Charlotte Hall, MD, USA

When getting on the highway with pedal all the way down start to get shutter at 4100 RPM through 2nd gear and then when it is in 3rd gear at the same RPM it will shutter even worse and then sometimes the check engine light will come on and start blinking for up to a min and then the truck will not move at all.

- Hamilton, OH, USA

This truck has a very bad habit of loosing power and throttle response after driving for extended periods in heavy rain/high humidity. This problem occurred the second day I owned this truck (original owner) and has happened several more times over the past 2 years. The most recent time it occurred I was merging onto the highway and the truck started to shake and lost all power, I ran out of room to merge and had to steer to the right of a vehicle that was in the break down lane...I had nowhere to go! my dealer has attempted the service bulletin to correct this condition but to no avail. 3.5L ecoboost is a hazard to operate under the above listed condition not only to myself but other people on the highway!

- Westbrook, ME, USA

When mild-accelerating to get to the highway speed limit of 75 my Ford F150 ecoboost started shaking at 55 mph and at 2,500 RPM my truck starts shaking and was unable to control. I had to exit the highway and drive at a lower speed I figured it was another engine misfire that I had replaced recently on 8/2/13. I then proceed to try again on the freeway and at 55pmh it again started to shake and rattle cause me to drive on the feeder road for the remainder of my trip to work.

- Corpus Christi, TX, USA

2011 Ford F150 ecoboost - purchased July 2011. When accelerating to pass traffic or merge into traffic. The vehicle shudders and shakes violently losing all power, the check engine light flashes the goes to solid. This was taken back to Ford dealership mechanics in Florida and Kansas 3 times now with no fix action in place. During a road trip in July 2013, (after a trip to Ford) we couldn't use the cruise control due to traveling over hills would cause the vehicle to lose power constantly to the point where some hills were almost impossible to drive over, vehicles behind me were honking and complaining as it barely made it up hills.

- Wichita , KS, USA

The contact owns a 2011 Ford F-150. The contact stated whenever it is wet or damp weather the vehicles speed and acceleration decreased. The failure occurred at least eight times. The dealer did not give a reason for the failure, but stated that this was a known issue. The vehicle was not repaired. The failure mileage was 3,000. The current mileage was 71,000.

- Centre, AL, USA

We were traveling on a two lane road. We were following a slow moving tractor trailer. We had been traveling for about 3 hours. It had rained earlier and was humid. I accelerated to pass and was partially around the truck when the engine of my truck started misfiring and lost power. Luckily, I was able to limp it along and get back into my lane before having a problem with oncoming traffic. The motor in my truck is the 3.5 liter ecoboost. I have seen reports of this happening to this motor, but this is the first time it happened so dramatically to mine. I don't recall having traveled for any distance in these conditions with this truck. The truck is scheduled to have this problem looked at. It was explained to me that there are different repairs depending on how the truck is equipped. This was a very dangerous event and I believe this should have been taken care of before the incident happened. I have read of a possible recall of the trucks with these motors to rectify the problem. It is evident to me that this needs to be done before someone isn't as lucky as we were.

- Randolph, NY, USA

While traveling to Florida with family on vacation just coming out of mountains of Tennessee went to pass a 18 wheeler hit gas was going 60 truck started shaking slowing down had traffic behind no cel light or any other warning light on let off gas three times before I could accelerate normal again then happened again in Florida on I 75 on ramp had to let off two times before could accelerate.

- Colfax , IN, USA

When I'm accelerating the engine stalls, I may be leaving a stop sign climbing over an overpass or passing another slower vehicle. Seems to happen more often about 40mph to 70mph.

- Grand Saline, TX, USA

Spring of 2012 acceleration failed when overtaking a slower vehicle. My speed was about 60 mph. This happened on more than one occasion. 06/10/13. Vehicle engine began missing and vibrating when accelerating at any speed. I was driving about 45 mph. Have sent the pickup to the dealer for inspection/repair.

- Lewisville, TX, USA