Hello I have a 2008 coupe and it darted making a loud knocking noise in idle if I give it some gas the noise goes away but then returns when car is back at idle if I turn off the car and turn it back in te noise is gone Untill I drive again and it warms up what is this?

 

check your oil level... if its terribly low... well buddy................................

 

Is it a knocking say like a metallic sound, or, does it sound like a Peterbuilt Diesel? Mine is brand new and the diesel sound is pretty common when it first starts, but the minute I slip it into gear...the sound vanishes. There are others on the forum that have confirmed this is normal with the VQHR37.

 

I had same issue. Dealer replaced the gas pumper.

 

Switch to Ester based oil such as Eneos or Motul. The dealer uses the Nissan petroleum based w/ ester additive to remedy this but it is not as good as the fully synthetic ester based Eneos for the same price. I switched to Eneos early as a preventative and have never had this issue.

 

Eneos has no ester FYI. Redline in the other hand is fully ester and synthetic

 

I thought they changed the formula?

 

Auto or manual?

 

Was your problem ever resolved?

 

You probably have already checked this, but I had knocking with certain brands of oil filters. Seems like our cars are picky and, so far, only the stock filter or Mobile 1 (don't scream at me!) are OK from my limited experience. Of course, I wouldn't rule out the oil as others have said. I use Castrol Edge / Synthetic 5W30 and have had great results with it.