We purchased a car from nab autos in fredericksburg, va. After the 7th day of driving it, the motor blew up. Wrong spark plugs were installed by dealer. Also the truck had been raced with nitrous which we were unaware of until we tried to find out what happened to motor. I have documentation from the repair shop. My 18 year old son drives this vehicle which began losing power and shaking before he was able to pull off to the side of the highway.

- Ashland, VA, USA

Driving on the freeway a spark plug came out of the engine causing the vehicle to shake and loose power. The dealer and a shop I took the vehicle to stated that this is a frequent problem with this engine.

- Kaysville, UT, USA

#4 sparkplug ejected

- Jeddo, MI, USA

Spark plug failure as accelerating from a stop light, and engine problem resulting from 7 cylinder operation. Got it to a mechanic and he was able to sleeve the spark plug thread and install a new plug. Now the same is starting again. I am taking the vehicle to the mechanic to make permanent repairs for all the spark plug. This may end up with the engine heads being removed in order to make complete repairs, and the cost for that will be thousands of dollars. This is a Ford engine design problem that Ford has been aware of, yet they continue to deny any responsibility.

- Seattle, WA, USA

Was driving down the road at 35 mph and heard a pop then the engine started to run rough. Took to the mechanic said that I had a blown spark plug.

- Pierre, SD, USA

A spark plug ejected from the right side head of the engine head while running down the hwy at 60 mph. The head might be damaged. I haven't had a chance to get it fixed. Been a Ford truck guy all my life & I can't believe Ford hasn't accepted any responsibility of any portion or kind for this. My estimated expense to repair this is $1,000 to $3,000 depending on any damage to the head etc.. I paid $4200 for the truck in April of 2013...it is in very good condition & to good to junk in my opinion. Besides I can't afford to buy another truck so I have to try to fix it. This is beyond disappointing, it is a major blow to the budget etc. Etc. Etc......

- Wisconsin Dells , WI, USA

Spark plug ejected while driving on high way. This is the second time a plug has ejected. The first time the truck had 39000 miles, original factory torqued spark plugs.

- North Andover , MA, USA

Spark plug blew out of engine. This is the second time in a year on two different plugs. These are the original plugs.

- Wisconsin Rapids, WI, USA

Oil leaking passenger side rear on to the starter and exhaust system.

- Las Vegas, NV, USA

A spark plug worked loose from the head and blew out causing damage to the head and the ignition coil. All 8 plugs had to be replaced, two damaged spark plug holes repaired and two ignition coils replaced.

- Hortonville, WI, USA

Driving on highway 30 mph and #3 spark plug blew out.

- Mineral Wells, TX, USA