Ok here's the deal. Aftermarket TB. TPS set to .497 at closed throttle. Idle screw all the way closed.

Idle is at about 1100rpms. Small surge to 1400rpms. No CEL.

pull the AIC. Idles drops to a steady 500. Put my hand over TB opening and the car dies. So I can assume that there are no vacuum leaks.

What gives?

What kind of effects occur when the throttle plate isn't exactly closed all the way? Would this cause my problem? Also, should the car die in a normal set up if the idle screw is all the way closed? Just wondering.

Is there a way to tell or adjust the throttle plate to be closed all the way?

Any help would be appreciated. Thanks in advance

 

Clean the IACV with some carb cleaner and get a new gasket for it.

 

throttle blade not fully sealed in the opening, adjust the stop screw.

 

I thought that the throttle blade shouldn't be 'fully' seated in the bore, as after awhile it would cause a 'rounding out' where it comes into contact, thus creating a bigger air leak....any truth to that?

 

But the question is... when do you know where fully closed is? by adjusting the stop, when will I know where "closed" is? I'm looking for an easy way to know where closed is supposed to be. is there an easy way to figure this?

I will try to adjust the stop screw as best I can.