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

I was driving at 60mph in a foggy rain when I began up a hill. I moved to the left lane as the two cars in front of me were slowing when my engine stuttered and I lost power causing me to drastically slow down. A service required message flashed on my display and a advanctrac service light illuminated. For the remainder of the trip I had very limited power and the vehicle was gear hunting. Once powered of and powered back on the vehicle operated normally.

- Cortland, OH, USA

I had slowed down to exit off the freeway to get on another freeway. When I pushed the accelerator, the truck started to shutter, shake, and lose power. I took my foot completely off the accelerator and let the truck coast a short distance. When I tried to accelerate again, the truck seemed fine. It did this twice on the same day. I took it to the Ford dealership and they told me the truck was fine. I have an eco-boost V-6 engine.

- Heath, TX, USA

The truck has a shutter when accelerating. It has a hesitation all the time in the engine. If I am going up a hill and running the speed limit, it has a major hesitation before it will shift gears to get on up the hill. The gas mileage is not as good as it claims to be either.

- Crossville, TN, USA

While driving at highway speed, I heard a pop and 'ding' sound before losing all electrical items - dash board, head lights, tail lights, brake lights, turn signals, etc., but the engine was still operating. I then felt a grinding noise and immediately exited the highway safely to park at a gas station. I turned off and removed the key but the engine was still running. I was only a few miles from a Ford dealership. I inserted the key, turned it to the on position and tried to put the truck into gear while depressing the brake. The transmission brake release would not work. I called roadside assistance who scheduled a tow to the dealership. I had to call the dealership to figure out how to turn the engine off. They advised that I should pull the fuel pump relay fuse which did stop the engine. To date, Ford does not know what is wrong.

- Abingdon, MD, USA

Merging onto interstate at 50 mph I accelerated hard to merge into traffic. Complete loss of acceleration nearly causing an accident with a tractor trailer behind us. Violent shuddering of entire vehicle, check engine light flashed and then remained on. After nearly a minute of feathering the accelerator, the problem subsided and ability to accelerate was regained. This had already happened once on the same drive and a couple if times prior to this incident. I dropped the truck off at the dealer this am after driving it for two days with the check engine light on. They said they would call with an update in the afternoon, but when 7pm rolled around and I had not yet heard from them I called to see what was going on and was told that they were waiting for a replacement intercooler and to call back in the morning and speak with the service advisor. Seems like a very common - not to mention dangerous - problem for Ford not to be publicly dealing with it, or at least being more proactive about issuing a recall for. Hopefully no one gets hurt before the problem is acknowledged & fixed.

- Chicago, IL, USA

Vehicle was purchased on 3/16/13 as a demo model with 6300 miles on it. Made a left turn and accelerated to merge into traffic on 3/19/13 when the whole vehicle shuddered violently and the engine lost power resulting in people having to hit their brakes and honk at us to avoid hitting us. The engine continued to bog down as the accelerator was pushed. I let the vehicle coast to almost a stop before the symptoms went away and could drive as normal. I looked up symptoms on internet and found many people experiencing same symptoms with this new eco-boost engine by Ford in their trucks. It seems that the intercooler can collect condensation in humid or rainy environments and have that water forced to the engine when the accelerator is pushed hard causing the vehicle to shudder and lose power. Ford has apparently identified this problem and issued a tbs service bulletin instructing the charged air cooler be replaced with a newly designed one for model year 2011-2012 F-150's with the 3.5L V6 eco-boost engine if a customer complains of the above symptoms and some people have reported this solution has not fixed the problem. This is extremely dangerous as one could lose power as many have reported, towing heavy loads, on the highway passing and other situations that a loss of power could lead to a fatal accident. The "newly designed" charged air cooler has been on back order for months and people are being told to "drive their vehicles carefully" if their dealer doesn't provide a rental or vehicle to drive while awaiting repair. My vehicle was taken back to dealership on 3/21/13 and has been sitting their awaiting the part as I feel it is unsafe to drive.

- Greenwood, AR, USA

Full throttle passing. Severe engine miss. Loss of power. Could not complete pass. Had to pull back in line. Seams to be problem on ecoboost V6 engines. Cold climate humidity. Possible fix service bulletin parts B O intermittent cant predict when power loss will happen

- Washington, DC, USA