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The idling speed is automatically sensed ....and set by the Air control valve
valve variator
You turn the valve cap anti-clockwise!
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.
Worn valve, bent valve, damaged piston and/or rings, head gasket failure.
inlet is 0.10 to 0.15mm and exhaust is 0.25to0.30mm ...
E-mail Haynes Car Manuals and ask if they do a manual for this vehicle, then buy one.
Combined mpg actual 1600 rt scenic 8 valve =37.5mpg
in enging compartment