Summerisway2hot
Member
13 GT Cold and Low RPM Misfire
I bought my 13GT about 2 years ago and have a long highway commute so its at about 122k miles now. With about 60k on it, one of the coils failed completely- replaced it and all four plugs and no more issues. At about 115k, I started noticing an inconsistent shake at low RPM under heavy load (which occurs a lot during my commute). Recently, I began noticing that it inconsistently sounded rough during a cold start up as well, and last week it began throwing P0300 and P0303 codes. Knowing the issues I had in the past, I tried to diagnose and ended up replacing the plugs and the coil pack- no dice. Since it only occurs when the engine is cold and warming up or under heavy load at low RPM (aka running rich), my next thought is fuel. My code scanner is a little cheap one that wont give live info, so its hard for me to prove injectors vs fuel pump, etc.. The other thing that came to mind is I recently replaced my exhaust mid pipe due to a progressing exhaust leak. I dont hear a leak from the header, but I also cant see it since its covered in heat shields- anyone have any experience with a failed 2.0 exhaust manifold? How about a fuel pump or injector? I feel like I need more information from the car to truly diagnose- anyone have a code reader that does good freeze frame/live data that theyd recommend for reasonable money?
Sorry for the long post, trying to make sure I didnt miss anything. Thanks in advance for any advice.
I bought my 13GT about 2 years ago and have a long highway commute so its at about 122k miles now. With about 60k on it, one of the coils failed completely- replaced it and all four plugs and no more issues. At about 115k, I started noticing an inconsistent shake at low RPM under heavy load (which occurs a lot during my commute). Recently, I began noticing that it inconsistently sounded rough during a cold start up as well, and last week it began throwing P0300 and P0303 codes. Knowing the issues I had in the past, I tried to diagnose and ended up replacing the plugs and the coil pack- no dice. Since it only occurs when the engine is cold and warming up or under heavy load at low RPM (aka running rich), my next thought is fuel. My code scanner is a little cheap one that wont give live info, so its hard for me to prove injectors vs fuel pump, etc.. The other thing that came to mind is I recently replaced my exhaust mid pipe due to a progressing exhaust leak. I dont hear a leak from the header, but I also cant see it since its covered in heat shields- anyone have any experience with a failed 2.0 exhaust manifold? How about a fuel pump or injector? I feel like I need more information from the car to truly diagnose- anyone have a code reader that does good freeze frame/live data that theyd recommend for reasonable money?
Sorry for the long post, trying to make sure I didnt miss anything. Thanks in advance for any advice.