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

When accelerating to pass another car, the vehicle suddenly looses power. After accelerating rapidly to get on the freeway and releasing the gas pedal, the car continues to accelerate. Ford said there is a problem with their intercoolers and they have been on backorder for several months. This is a safety issue for me and my family and Ford tells me to continue to drive my car while I wait more months until the parts are ready. ## VIN failed ##

- Vacaville, CA, USA

While driving on freeway and trying to pass, vehicle started shaking violently and lost power. Also when pulling out into traffic vehicle when lose power and engine shakes. Engine light came ona nd has remained on. Very dangerous situations continue to happen daily. Ford ecoboost system has a problem, dealership says Ford is aware but does not know when parts to repair might be available. Says to continue to drive. I am concerned a major accident is waiting to happen. This seems to be something Ford was aware of when sold this vehicle.

- Porter, TX, USA

While traveling at highway speed (cold winter morning), with cruise control on, started to climb hill, engine began to throttle up, then the truck began to shake violently, engine lost power. Shut off cruise control and coasted onto shoulder. Was able to slowly engage throttle and continue, but any increase in throttle above "gentle" would bring on the shudder and power loss. Engine light flashed and stayed lit for next 20 minutes. Experienced similar scenario later the same day. Took to dealer. Dealer indicated charged air cooler works "too well". cools air so much that condensation forms and causes the issue. Dealer indicated a technical service bulletin had been issued on the problem. Need new cac and shield. Two weeks (+/-) before parts arrived. Dealer completed tsb 12-10-19, according to the work order: Replaced cac cooler assembly and installed new air deflector shield, reprogrammed PCM. Did not fix the issue. Same problem on the way home from the dealer. Drove it for one week assuming moisture may need time to "clear up". problem still existed for 7 days. Any mild to strong throttle input would bring on shudder. One week after "fixed" with new cac, I tried to merge onto highway, at 60-70 % throttle, violent shudder occurred and engine began to lose power. Again, coasted on shoulder until truck would respond to throttle input without shuddering and power loss. Luckily, traffic was "light" at the time. Could have been a serious incident. Engine light came on and has not gone off for 3 days. Now any throttle input beyond "gentle" brings on the shudder. Contacted dealer, going back in. Truck has eco boost V6.

- Des Moines, IA, USA

Traveling West on I-20 in tx for several hours through rain/mist/foggy conditions. Exited the highway for fuel. Upon reentering the highway and attempting to accelerate to speed, truck began shaking violently and did not respond to inputs from the throttle. I was able to speed up to about 45mph before the engine problem developed. Luckily I had a shoulder to pull over on as I had entered the interstate ahead of a tractor-trailer combo who was doing the speed limit and approaching my rear bumper very quickly. After the engine began misfiring at about 45 mph, I could not increase speed, I was only able to slow down and pull off onto the shoulder. During the incident, the check engine light illuminated, began flashing until the vehicle came to a stop on the shoulder, then remained illuminated until the truck was restarted 5 times on the shoulder.

- Eureka Springs, AR, USA