I was told over on the G35driver forum to post this question here.....

Got a 06 G35 with the VQ35DE motor...

OK, while running a compression check, I would hear a loud click(more like a pop) every few revolutions of the motor. Couldn't pinpoint location, but it was internal..

The compression check came out great... getting 125 psi on the first stroke, 150 on the second, and peak of 175 on the third stroke.... all cylinders within 5 psi of each other.

Also ran a leak-down test at 80 psi... all cylinders were within 77-79 psi

So very happy with the condition of the valves and rings at 34K miles.


So was the pop noise due to the type of VVT technology? as in the sprocketed cams?

On a side note.... With no test equipment hooked up and all plugs still out, the motor turned over(witht he starter) silky smooth and extremely quiet... no pop. And while turning the engine thru several rotations by hand, it also felt very smooth. Quite a bit of initial friction to start turning the crank, but smooth if you kept it moving.


On a side note... Is it normal for this engine to sound very rough when you shut it off?? Maybe due to the hi compression ratio? I would describe it as clattering to a stop... or is this due to the 1-2-3-4-5-6- firing order which MOST cars DO NOT have?

Thanks guys!