The dashpot when working slows the throttle plate's return to 0? starting at 2000 RPM.
The way you set the dashpot is by reving and holding the engine above 2000 RPM, then you pinch the hose coming out of the dashpot, then release the throttle with the hose still pinched and the throttle should stay held at 2000 RPM by the dashpot.
The dashpot should retract slowly, but not too slowly. Under normal operation the dashpot's actuator should return after just a second... if it takes longer it's sticking and it DOES hod the throttle open thus leaving the ECU without an IDL signal.
The brown and white valve on the hose connected to the dashpot is a damper and it is directional. The brown side is what connects to the hose and the white has the breather... yours is correctly connected, I just figured I would add this info for future reference.
For the last time, what screw are you adjusting for the idle? Knock it off and fix the f#$%ing cause of the code 51 first! It's time to suck it up, act like a woman and RTFM!
EDIT: You know, with the dash pot finally mentioned, EVERY possible cause for your problem has been listed in this thread... time to reread the thread and listen to what advice has been given man.
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