924Board.org

[the4ork]

unplugged the idle air whith engine cool, nothing changed, plugged it back in, nothing changed. engine runs exactly the same plugged or unplugged

is it bad?

[xpernet]

You have to leave the car idling for a bit before you can actually notice any changes. The way it works is that when it has power, it warms up then gradually closes the air bypass. So unplugging when its cold makes no difference as the valve is open anyways. Is your car idling at a high rpm when cold? Idle is around 950-1000rpm... for cold starts my car sits around 1500rpm for a bit then drops down.

The way to determine if its busted or not is to physically examine the unit, by taking it out and looking through it and see if the valve inside is opened or closed. It should be open when the unit is cold... even partially open is okay. If its closed then it could be busted.
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1977 Porsche 924
Sunroof Delete
Megasquirt II EFI & EDIS
Carrera GTS / 944 Body

"If one does not fail at times, then one has not challenged himself." Ferdinand Porsche

[the4ork]

Mine does the opposite it's 500-600rpm when cold and then 1100 when warm, I had to back the idle screw out a bit to get it to stay running when cold I'll take it off and have a look inside