I have not driven my 2003 G500 for a while.

Today I started it. And there was a distant tapping sound coming from the driver side of the engine. The tapping sound occurs about 2-3 times per second at idel. The tapping sound increase with the speed of the rpm but decrease with in volume. But when the car is completely warmed up (after 5 minutes of idling) all sound is gone. I know injectors make tapping sounds too, so it could be the injector. However, it could be the lifter and when the lifter warms after 5 minutes then it is not lose anymore. My thinking is that it is not a lifter problem because the tapping sound goes down when the speeds up, but I don’t know. What are the signs of a lifter problem? And how do you tell a lifter from an injector sound.

Thanks

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Silver Honda Accord, 2006
Silver G500, 2003
Silver SLK-320, 2002
Black ML-320, 2000
Bule Porsche 993 Targa , 1997
Silver Merkur XR4Ti, 1987