![]() ![]() Ford Motor Company states this is normal operation of the vehicle. The symptoms experienced are a vibration that begins at approximately 2800 rpm and decelerating to approximately 2200 rpms. Once a solution is found, a technical service bulletin (TSB) should be issued, and covered under OEM and extended Ford Motor Company drivetrain warranty. To whom it may concern at Ford Motor Company, This petition calls for Ford Motor Company to investigate and resolve a specific vibration issue associated with the 3.7L V6 Mustang powertrain. Then focus your efforts on those.This memorandum is in reference to all owners of the 2011 – 2014 model years Ford Mustang with the 3.7L V6 powertrain. If quicko cranking compression test sounds OK, run a cylinder balance test with a any code scanner and find out if there are any weak cylinders. Maybe a rocker came loose, maybe it's something worse. If it speeds up every few pumps when it cranks, r-r-r-r-R-r-r-r-R-r-r-r-R-r-r-r, you can guarantee a compression problem on one or more cylinders and it's time to find out why. ![]() If it cranks even, compression is not likely a problem and you can rule out a valvetrain issue, time to focus on fuel and spark. If it's a rhythmic thing, pull the coil wire and crank the motor over for a few seconds and listen carefully. Any wobbling or rubber coming out between the rings means imminent failure and an immediate change is required. Is it a rhythmic rough idle, like a misfiring cylinder, or a random roughness? If it's a vibration/roughness then look to the harmonic damper and make sure it isn't coming apart.very common. TPS sensors don't make the engine run rough. Ahh yes, the TPS sensor, the solution to all life's problems and the thing to waste time and money on when you can't think of anything else to do. ![]()
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