Engine Noise
We followed your advice and checked the air/oil separator as per the manual and found it operating properly. We have determined noise is coming from the passenger side of the block in the rear where the timing chains are located.
The noise was getting louder emitting a distinct "chirping" noise varying with rpm. For kicks, we added EXtreme Oil Additive and followed instructions to drive for 100 miles. The noise has been reduced substantially but I'm sure it is only temporary. Next step is to remove Vari-cam sensor to see if it is rubbing. Other than that we will have to drop engine and tear-down. Anyone have another idea?
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