I have a 2009 g37s coupe. There is an engine tapping noise coming from underneath the car during idle rpms. Went to the dealer in North New Jersey. After "one hour" diagnosis. The dealer did the latest ECU and Transmission software updates, but the noise still occur around 800 ~1000 rpms. The dealer could not find anything wrong after I spent $260 ($130 diagnosis and $130 labor programming ECM/TCM). I do know the muffle assemble is no good, but since the car is out of basic warranty, I would just purchase after market exhaust to put on. Please help with the noise. I have upload the video on youtube, let me know what you guys think.

2009 g37s engine/underneath tapping noise - YouTube

 

See this tread and video. https://www.myg37.com/forums/g37-cou...cing-this.html

 

Thanks, but mine is the 7 speed AT. The sound is only notiecable during low rpms

 

They fixed mine by replacing the gas pump and a part from the engine(covered under powertrain warrenty).