I've had a few clues along the way: occasional P0430 codes, long term fuel trim values above +10, less than smooth idle, high HC on smog test etc. But now I'm just starting to hear a vacuum leak around the throttle body area at the back of the engine.

I'm wondering if there are any known trouble spots for vacuum leaks on the supercharged engines? I was surprised to find that this engine has an EGR valve. I wonder if these are prone to vacuum leaks?

Thanks,

RGW

 

RGW.:
The part load and full load breather tubes (cracks) and the intake plenum "resonator" are all known leak areas on your car.