Hey guys, Everytime i schedule a appointment at the dealership the car starts running fine and the check engine lights go off.

Lately it has been sputtering and has for over a year now off and on. Something that's showing up all the time now is misfire codes which explain the sputtering. When it misfires the car goes in limp mode and pulls 0 psi of boost until i shut the car off for 10 seconds and start it back up and it's fine again.

Today, It decides it doesn't want to misfire, instead it wants to pull 4psi and make a strange noise with the bypass valve. No lights are thrown.

I turned my car off and back on and now it's fine until next time.

The cars bones stock with a k&n filter and the power upgrade. This happens with the stock airbox on or off.

Any ideas?

Video was filmed by my passenger and the car was at WOT (lol)

View My Video

 

I'm going to take a wild guess and say you should check the TMAP sensor wiring for starters. And also search around for more info...

 

map sensor on the cold side pipe (the pipe from intercooler to throttle body) and put stock air filter back in.

98% of the LNF's need a tune when running a K&N filter.