On hard acceleration like when entering a highway or trying to pass another car it will miss fire continuously thru the acceleration 60-70 mph.shaking violently and check engine light blinking throwing P0300 codes for misfiring at 47,000 miles changed all spark plugs / coil packs / wires / air filter / 48,000 still misfiring

- Denham Springs, LA, USA

2011 F150 connecting rods broke at normal highway speed beating a hole in block oil is all pumped out of motor coverimg the windshield of cars behind me one was 80000 the second was only 60000.

- Crossville, TN, USA

Takata recall there is a cold start noise kinda sounds like a grinding noise also have a huge power loss when ever trying to accelerate. I get codes P0016 P0017 P0299. I have changed all came and crank sensors.

- Taylor, MI, USA

The engine on my 2011 ecoboost 3.5 L V6 Ford F150 shudders and stalls when you try and accelerate. The problem is sporadic. The truck has 67,000 miles and has stalled out when I was trying to accelerate into busy intersections or making turns at least three times and has happened while driving on the interstate four times. It was quite scary and extremely dangerous. The dealership says that the issue is my truck and not a Ford problem, though this is clearly something that has occurred in countless 2011 ecoboost F150 engines as it is all over the internet. This engine should be investigated by your organization and the vehicles should have been recalled. Below is a link with thousands of complaints that are all the same. M.carcomplaints.com/Ford/F-150/2011/engine/engine.shtml two dealerships suggested I replace the engine at a cost of $12,000 to me. Currently, the car is not driveable.

- Austin, TX, USA

While traveling on the highway in the rain the truck began to shutter and loose power during acceleration. A few days later in sunny weather it was fine with no problems accelerating. Looks like from reading on the NHTSA site this is a turbo issue that occurs during humid or wet weather. Since Ford is aware what will they be doing to solve the issue?

- Fort Mill, SC, USA

Vehicle loses power and misfires when accelerating especially at 50mph or higher. Recurring problem over the years. Mostly an issue when passing on two-lane highway. Extremely dangerous.

- Stillwater, MN, USA

On hard acceleration like when entering a highway or trying to pass another car it will miss fire continuously thru the acceleration.on several ocasions it down shifts and then the engine loses power.this has happined meany times in the last 2 to 3 years.

- Shelby Twp., MI, USA

The contact owns a 2011 Ford F-150. While driving approximately 50 mph attempting to pass a tractor trailer, the engine misfired and the vehicle would not properly accelerate. During the incident, the check engine light illuminated. The vehicle was taken to the dealer where the spark plugs were replaced, but the failure recurred. The manufacturer was notified of the failure. The failure mileage was 88,000.

- Cincinnatti, OH, USA

While accelerating onto the highway truck began shaking violently and lost power. I was towing a trailer at the time and was nearly struck by a large truck because I couldn't get up to speed or off the highway because of loss of power. This is a known problem with 3.5 liter ecoboost engines and it is only a matter of time before someone is seriously injured or killed because this issue has not been successfully addressed by Ford.

- North Canton, OH, USA

Since I've owned this vehicle new, I've had a number of problems related to acceleration. Vehicle would almost stall on hard acceleration when getting on the freeway. Dealer replaced spark plugs & boots, but condition was not completely resolved. Vehicle would still on occasion repeat the same problem. More recently when driving yesterday, the engine light started blinking, then became steady. Of greater concerned I got an engine light & poor acceleration. Took the vehicle to the dealer & dealer is telling me that the timing belt needs to be replaced at a cost of $2000+. vehicle had just turned 61000 miles. Dealer service agent tells me its not uncommon and could be caused by not getting the oil changed at recommended intervals. Vehicle has had regular oil changes at the dealer & other service facilities. Never heard of this & I think it's premature for a vehicle with 61000 miles to need the timing belt replaced. Never had this happen in 45+ years of driving.

- Northville, MI, USA

While driving on hwy when acceleration the vehicle looses power and I had to pull over and shut off the engine and re-start it, almost causing an accident. Then when driving on normal road conditions and accelerate the vehicle to pass, and the same thing happens, the engine miss fires, looses power and the check engine light is on since the first time it happened. Took the truck to the Ford dealer and they said it was "an ongoing problem with the ecoboost and the air charge cooler". they said the fix is to put a intercooler deflector (piece of plastic over the intercooler), change the spark plugs and do a vehicle software update witch is going to cost around $700 to fix. Outrageous cost for a tune up and a piece of plastic for something they know its a "ongoing problem" and don't want to have a recall. This is a safety issue, and they know about it but since the vehicle is out of warrantee I have to deal with it. Wonder how many others have this issue?! this is definitely the only and last Ford I will buy. This does not guarantees that its going to stop it from happening again. With this amount of money I could buy an aftermarket intercooler, do a complete tune up and still have money left.

- Byron, GA, USA

The contact owns a 2011 Ford F-150. The contact stated that while driving at various speeds, the accelerator pedal was depressed but the vehicle lost power. In addition, the check engine warning light illuminated. The failure recurred on numerous occasions. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 86,000.

- Newhall, WV, USA

The contact owns a 2011 Ford F-150. While driving 65 mph, the engine stalled. The check engine light illuminated when the accelerator pedal was depressed. The vehicle was taken to a dealer where it was diagnosed that the spark plugs failed and needed to be replaced. The vehicle was repaired; however, the failure recurred numerous times. The manufacturer was not notified of the failure. The failure mileage was approximately 49,502.

- Exceisior Springs, MO, USA

While driving on interstate, check engine light came on and engine began to shudder very violently while losing power. Was traveling approx. 70mph

- Douglas, WY, USA

The contact owns a 2011 Ford F-150. While driving 45 mph, the vehicle lost power, came to a complete stop, and the rear wheels locked up. In addition, when the accelerator pedal was depressed, the vehicle failed to accelerate. In addition, the steering wheel completely seized and the rpms increased. Multiple warning lights illuminated. The failures recurred numerous times. The vehicle was taken to an independent mechanic who was unable to diagnose or repair the vehicle. The VIN was included in NHTSA campaign number: 16V248000 (power train); however, the part needed to repair the vehicle was unavailable. The manufacturer was notified of the failures. The failure mileage was 40,000. VIN tool confirms parts not available.

- Coral Gables, FL, USA

Thousands of Ford F150 owners (20011-2015) bave experiencing with ecoboost engines mostly with my most recent issue "timing chain stretching chain" and faulty cam phasers, I believe we deserve to at least get our vehicles fix. I struggle paying my truck and I cant pay 4000 dlls to fix this issue that I strongly believe is a Ford's negligence. Please help us my name is [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- El Paso, TX, USA

The contact owns a 2011 Ford F-150. While driving at any speed, the vehicle shook, lost power, and slowed down without warning when the accelerator pedal was depressed. The engine warning light illuminated. The contact stated there was a recall and the vehicle was repaired; however, the failure recurred. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The recall information was unknown. The failure mileage was approximately 120,000.

- Maceo, KY, USA

I noticed my 2011 Ford F-150 was running rough. I took it to the dealer and they diagnosed a cracked 3 cylinder head. In the beginning it was a blown 3rd cylinder head and was going to cost $5,000 to replace the cylinder and look at the rest of the engine. Ended up being a cracked cylinder. Now looking at a new engine to the tune of $8000. This has a 5.4 liter Triton engine with less than 137,000 miles on it. I bought it in 2013 with 500 miles on it. 90% of miles are highway. I expected to get at least 175,000 miles out of it. I remember hearing a loud pop while going down the road but thought it was a rock thrown up from a tire. The engine ran fine and I didn't notice anything. Until a few weeks later when it was running rough. I had the spark plugs changed at a little over a 100,000 miles as recommended. My belief is that the #3 spark plug blew causing the damage to the #3 cylinder.

- Worland, WY, USA

The contact owns a 2011 Ford F-150. While operating the vehicle, the transmission downshifted hard and the vehicle jerked without warning. The vehicle was taken to the dealer where the technician made adjustments to the transmission sensor, but the failure recurred. In addition, while driving various speeds, the vehicle shook and vibrated. The vehicle was taken to the dealer where it was diagnosed that the engine cylinder coil failed and the cylinder battery pack needed to be replaced. Eventually five of the six cylinder battery packs failed and were replaced. The manufacturer was notified of the failures. The failure mileage was 20,000. Updated 08/04/16

- Waynesville, NC, USA

I was driving and I had loss of power started misfiring shifting funny and I was almost killed by a large truck something needs to be done.

- Newnan, GA, USA