Hey guys, I have a 2012 V6 Mustang with the performance package. A little over 35,000 miles. Only mod is a JLT CAI.
Lately it has something of a hesitation during hard acceleration, basically when you punch the gas, it accerates smoothly and sounds normal, until around 3-5k RPM...then all of a sudden the engine gets WAY louder than it used to, but without very much actual acceleration. Then the noise drops down, the acceleration picks up and then the noise will pick back up again when the variable valve timing kicks in again (5-6k RPM?).
It used to always accelerate smoothly, with a smooth sounding powerband. Now all of a sudden the engine roars out of nowhere, but without any real acceleration going on in the back end, and after 1-2k RPM it goes back to normal. My first thought was a slipping clutch, but the RPM's don't jump up when this happens, they climb gradually like they're supposed to.
This only really happens when you get on the gas, it doesn't happen if you're easy on the throttle. I'm no stranger to auto mechanics, but this one has me stumped, and all my mechanic friends stumped as well. The car is still covered under my extended warranty, and I'll probably make an appointment with the dealership soon, but I was wondering if anyone has had this issue before so I at least have an idea of what's wrong before I take it in.
Lately it has something of a hesitation during hard acceleration, basically when you punch the gas, it accerates smoothly and sounds normal, until around 3-5k RPM...then all of a sudden the engine gets WAY louder than it used to, but without very much actual acceleration. Then the noise drops down, the acceleration picks up and then the noise will pick back up again when the variable valve timing kicks in again (5-6k RPM?).
It used to always accelerate smoothly, with a smooth sounding powerband. Now all of a sudden the engine roars out of nowhere, but without any real acceleration going on in the back end, and after 1-2k RPM it goes back to normal. My first thought was a slipping clutch, but the RPM's don't jump up when this happens, they climb gradually like they're supposed to.
This only really happens when you get on the gas, it doesn't happen if you're easy on the throttle. I'm no stranger to auto mechanics, but this one has me stumped, and all my mechanic friends stumped as well. The car is still covered under my extended warranty, and I'll probably make an appointment with the dealership soon, but I was wondering if anyone has had this issue before so I at least have an idea of what's wrong before I take it in.