Hey guys. I have a 04' G35 120,000 mi and I have developed a metal sounding flutter at start up. When your looking at the engine the sound is coming from the 1st cylinder on the left hand side. It only does it after sitting for more than 24 hrs?? What do you think? Jet

 

mine start doing the same thing. anyone here can help or answer to this before bring it to expensive dealer for quote??

 

change your sparkplugs, check for oil

 

maybe because ur burning oil and ur timing chain is not getting oil, it does that...
add more oil, check ur valve cover when changing spark plugs, check for leakage.