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valve variator
You turn the valve cap anti-clockwise!
According to Wikipedia, a variable valve timing is a "process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions".
there isn't a drain plug, you will have to remove the bottom hose
EGR valve sooted up
Common problem have Solenoid replaced Usually the pressure regulator valve.
Variable valve timing.
Variable timing valve train
The idling speed is automatically sensed ....and set by the Air control valve
This component is electrically operated by the engine computer. It (on most vehicles) changes the oil pressure in the variable valve timing system to adjust the valve timing. It is very similar to the solenoids in use inside an automatic transmission.
Worn valve, bent valve, damaged piston and/or rings, head gasket failure.