Multiple acceleration issues, especially when attempting to pass another vehicle and/or when accelerating abruptly. I have also noticed condensation from the exhaust when first starting the vehicle in the morning on multiple occasions.

- College Station, TX, USA

Straightening our vehicle in parking place at home depot. Slowly (~2mph) going forward with foot on brake when engine suddenly speed up. Mashed down hard on brake while shifting into neutral. Tires or clutch screaming so loud it drew a group of yardmen unloading a truck nearby. Shortly after getting it shifted into neutral engine resumed normal operation. Took to Ford dealer immediately and will be evaluated after the holiday. Several times in the week prior to incident I noticed some slight "stuttering" of the vehicle when slowly moving forward to park in driveway, also noticed for the past 1 to 1.5 months there has been a 2+ mile per gallon decrease in fuel mileage running over the same routes.

- Sacramento, CA, USA

I was merging into traffic on I-10 in Florida from an entrance ramp. I was going 55 mph when I had to accelerate in order to merge with traffic. Upon attempting to accelerate, the engine lost power and began to shake causing me to have to brake really hard and move to the shoulder of the road so that I wouldn't collide with traffic already moving at 70 mph in the lane I was attempting to merge. This is the first of several incidences in which the vehicle lost power under acceleration.

- Crestview, FL, USA

Driving in raining conditions, when accelerating I would loose power when the turbo chargers kicked in. It was as if the turbo chargers were picking up the moisture causing the engine to misfire and would loose all power for acceleration. Even after the rain stopped, this acceleration problem stayed with the vehicle for the remainder of the trip. The next morning, still had same problem but as the temperature went up and humidity decreased the problem got less severe and by the end of the second day the acceleration had returned to normal. The first occurrence was when I was passing a semi trailer, I tried to pull out around in passing zone on a single lane in each direction, when the engine didn't respond I had to break and fall back being the semi. Luckily, this occurred as I pulled out to pass the semi, if it had happened after I along side of the semi, there would have been no way to accelerate to pass the semi or return to my side of the road before the oncoming traffic arrived. I have heard of other individuals experiencing the same during raining conditions and don't understand why Ford has not issued a fix for this problem.

- Rockwall, TX, USA

Losing power, vehicle shake, check engine light. Je demeure au quebec, je parle francais. Si vous avez D autre info a me demander, N hesiter pas.

- Sept-Iles, CT, USA

My wife and I were driving in Maine on vacation hauling a 3600 lb 14 foot camper. It was early evening and raining, I was in a flat area coming into a steep hill so I accelerated hard and the engine staggered hard. It was like a hammering for several seconds and a total loss of acceleration. I thought I had actually broken the engine some how. A few seconds later the hammering stopped and the truck returned to normal. When I talked to my Ford tech about it he said it was bad gas. The engine since then has had a ticking sound that the tech says is the fuel injectors working, I'm not so sure since it did not make that sound before the above described incident. It has not recurred, but I have been careful not to expose the vehicle to hard acceleration again, but that hardly seems to be an appropriate solution.

- Madison, WI, USA

Truck has 3.5L ecoboost V6 engine. 18 May 2013. Was traveling on two lane highway in central Georgia. Pulling a 3000 lb utility trailer. Had been driving in light rain for about one hour. Speed limit was 55. I was following a car that was going about 45 mph. When I got to a slight uphill grade there was a passing lane available and clear of other vehicles. I pulled to the left lane to pass the slower vehicle in front of me. I pressed the accelerator about 3/4 down to attempt a downshift of gears. The truck immediately began vibrating/shuddering and lost almost all power. I pulled back to the right lane and held light pressure on the accelerator and was able to maintain about 20 mph speed. I held the throttle steady and after about two minutes the engine regained full power and I proceeded on my trip.

- Perry, GA, USA

I was driving on a 2 lane highway, behind a semi truck, with several cars behind me. We came to a passing zone and I began to pass the semi truck. I moved to the oncoming lane and accelerated, but the truck lost power. I began slowing down in the on coming lane, but couldn't return to the right lane because the vehicles that were behind me were passing me in the right lane and I had a vehicle directly behind me that was followed me to pass the semi truck. I locked out 5th and 6th gears on the transmission to gain some RPM but the vehicle started to shudder violently. I moved to the shoulder of the on coming lane and shut the vehicle off. I sat on the shoulder for several minutes, got out of the vehicle and checked under it for fluids. There were no fluids under the vehicle. All the gauges read normal. I did all this on the shoulder of the oncoming lane facing oncoming traffic. This was not a good position to be in. I started the vehicle, put it in gear to see if it would move, it did. I had full power and got back into traffic and the truck ran fine. No warning lights, no indication that anything was wrong. Several miles later I lost engine power again, and again got the violent shudder, and the check engine light came on. Going to see the dealer today. This is bad! the first incident could have caused a huge accident. Moving onto that left shoulder proved to be a good move, but I was at pucker factor 10 for a few seconds.

- Newburg, MO, USA

The contact owns a 2012 Ford F150. The contact stated that the vehicle lost acceleration power while towing a boat. The contact was able to shift the gear manually and regain acceleration. The vehicle was taken to the dealer to have a diagnostic performed, which was unable to locate a failure code. The dealer also test drove the vehicle and was unable to duplicate the failure. The contact stated that moisture penetrated the eco-boost and caused the vehicle to lose acceleration. The manufacturer was not made aware of the failure. The failure mileage was 28,000 and the approximate current mileage was 28,300.

- Wheelersburg , OH, USA

The contact owns a 2012 Ford F-150. The contact stated that while driving 30 mph, the contact attempted to accelerate but the vehicle decelerated and shook violently. The vehicle was taken to the dealer where it was diagnosed that the ecoboost chamber was defective and needed to be replaced. The manufacturer was not made aware of the failure. The vehicle was repaired. The failure mileage was 4,000 and the current mileage was 9,000.

- Ocala, FL, USA

On Monday December 11, my wife and I left on a trip to Indiana with approximately 10,400 miles on the truck. After a stop, at the bowling green, ky., rest stop, I proceeded to return to traffic on interstate 65. After determining I could safely accelerate in front of two semi-trailer trucks, I entered the highway at approximately 50 mph and went to full throttle. Instead of accelerating, the engine went into a total loss of power. Amid the blowing of air horns and my wife's screams I was lucky enough to avoid a collision by yanking the truck onto the emergency lane. The engine did not stop running, but appeared (to me) to be totally flooded. The engine ran on ?? (number of) cylinders for approximately one eighth of a mile before returning to running on all cylinders. I do not think the service department believed me when they looked at the truck. I have been a mechanic and an engineer for a lot of years, I know what happened this time and it came very close to a serious accident and/ or injury to my wife and me. This was a very close accident avoidance and it practically destroyed our confidence in the truck. While still on our trip, we made the decision to forgo the hassle of trying to persuade the service dept. There was a problem, and get a different brand of new truck. I have taken the high financial loss of trading for another new truck. I am not totally satisfied with this vehicle. The Ford has many enhancements and I probably should have tried harder to get the appropriate service action. But would it have been worth the risk of another engine incident, no I do not think so. This was the second and most serious incident and after Ford service had pronounced there was no problem with my engine. I sold the truck with 11,399 miles on the speedometer.

- Killen, AL, USA

Vehicle since brand new has a stuttering/stalling issue at 55mph and the dew point is high. Attempting to pass a vehicle accelerating from 55mph and the truck either stutters or stalls. This almost caused a head-on collision. I am scared to pull out in traffic or pass anyone due to the inherent issue. Ford did replace a intercooler/cac following tsb 12-10-19. This has not fixed the problem. We. I returned the truck still broke. The service manager at the dealership told me he has the same truck and that it is an inherent engine problem Ford has acknowledged but they could not do anything for me. I am worried everyday I might die driving my truck and even more upset that I pay monthly for something that is broke.

- Petoskey, MI, USA

Well I purchased this truck a brand new 2012 Ford F-150 XLT super crew w/ 3.5L ecoboost engine. The truck had 104 miles when I bought it. After a week I started to notice that the truck shudder's when I accelerate from a dead stop and it also shudders when I come to a full stop. For about a week every single day and time I would start and stop the truck would shudder. I thought this was because the engine just needed to break in. Well I am going on the 4th week of owning this truck and it still occurs. The shudder that is. The shudder also occurs now when I have a cold engine start and I put the truck in reverse it starts to shudder. I do feel as the driver it has effected the performance of my truck. 854

- Tacoma, WA, USA

Firstly, while driving along a 3 mile straight stretch of road I pull out to pass a slower vehicle. My truck engine shut down in to what Ford describes as "limp home mode" mid-pass and I had to decelerate quickly and get back in to my lane before a head on collision occurred. There were vehicles in the lane that I had to cutoff to get to safety.I had to pull over to the side of the road and shut off the vehicle then re-start it before the condition cleared up. This same scenario happened again in September of 2012. This time I was driving along with my cruise control set to 62 mph when for no reason the vehicle went in to "limp home mode" again. I had to pull over once again and stop/start the engine. I was in a fair amount of traffic when this occurred and it could have resulted in a dangerous situation had there not been a convenient pullout in the area. I took the vehicle to a Ford dealership for service and was told they could not find anything wrong. Secondly, the engine make a popping sound while I accelerate from a stop (again the dealership can find nothing) thirdly, the four-wheel drive system randomly cycles some unknown solenoid during use which the dealer cannot reproduce. This is a brand new ecoboost engine, which I love but which I feel is very unsafe and I can get no resolution from Ford.

- Anchorage, AK, USA

While attempting to pass another vehicle I tried to accelerate to get up enough speed. The vehicle started shuddering violently and lost all power, making it impossible to maintain highway speeds for a few minutes. For the next few minutes any attempt at acceleration resulted in more shuddering from the engine. This also happened a few months before at the exact same point on the highway. I have the ecoboost engine in my vehicle.

- Marble Falls, TX, USA

Loss of power when accelerating from a stopped position, more frequently as time goes on, and when truck has been driven for long periods of time. When first bought vehicle, there was a shudder and a shake extremely noticeable at 45 mph. The truck was brought into the Ford dealership where it was purchased and checked for a deflector plate. The deflector plate was installed, so a new intercooler was ordered and a long wait with this troublesome problem occurred. The new intercooler arrived and was put in, but the same problems persist. The shudder and shake is now more noticeable at 35mph but is still there and noticeable as ever. The Ford dealership told me that Ford has a new service bulletin out, but has not issued a fix. This is a serious issue, and I hope that with all the driving I do, I don't get a loss of power when I need it resulting in an accident and possible fatality.

- Ramsey , MN, USA

On my way home last October after picking up my new F-150 at the dealership I was attempting to pass a car on the interstate. It was on a hill and when I pushed on the gas to try and pass the car the truck shuttered and slowed down losing power and speed. The best way to describe it was that it "bogged" down. There was no engine light. However, I knew something was wrong, but I figured I would have it checked out when I came in to get the running boards installed. A couple of days later, however, an incident occurred that was a bit more dangerous. I was attempting to pass a slower car on a two lane highway (no hill) when the same thing happened when I pushed down on the gas to speed up to pass--the truck simply bogged down--losing power and speed. The engine light came on. I took it to the dealership and they have said that there has been reported similar problems with the engine and Ford was working on a fix. But so far there has been nothing from the company. I have avoided the problem by not accelerating the engine rapidly but this is not a permanent fix. There seems to be an issue with the ecoboost engine especially in rainy conditions. [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Westford, Vermont, VT, USA

Ford's ecoboost engine V6 3.5L cut power when attempting to merge on to highway at 55mph. Severe engine vibrations ensued. Very dangerous issue if there is a lot of traffic behind person driving. Truck still has less than 15K miles, has been in the shop 2X already in attempts to rectify the issue, and still has problem.

- Huntersville, NC, USA

While trying to accelerate from 50 up to the posted speed limit of 70 on interstate highway 10, the ecoboost engine in my truck stalled and started to misfire and shutter so severely causing my speed to decrease that I had to pull over to the side of the road to prevent from getting run over.

- Thicket, TX, USA

3.5-liter V6 ecoboost engine shudder, shake and then rapidly lose power while I'm accelerating. Advertised gas mileage of 22 is impossible; more like 16 highway and 14.4 in city. I had the engine checked at Ford dealership but no problems found!

- Spring, TX, USA