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One of the signs of a worn aging oil pump is the return of the VTC clacking at idle shortly after returning to idle. A nice mechanical oil pressure gauge will usually confirm the low oil pressure (often 7-9psi at idle) that accompanies the tick tick tick noise.
Note that there are two ticks. One is the solenoid when it turns on. That is not the noise I am referring to. You can turn this noise "off" by simply unplugging the solenoid.
The other noise is a consistent tapping that sounds like a rod knock. That is the gear slapping around due to either low oil pressure, low oil feed, or worn out internal gear.
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