Lol so i need to check for a vacum leak then what do i do if i dont have one ? What are th possabilitys it could be buddy

 

Ah, English, that I can understand. lol

If you have a vacuum leak how you fix it depends on whats leaking, if its a hose you replace the hose, if its a gasket you replace the gasket.

 

You can move the plunger on the stepper all you want. When you turn the key on and off a few times it will reset itself. When you turn the key off the stepper closes, when you turn the key on it will back off a predetermined number of steps. The number of steps correspond to whatever was programmed into the ECU map as it relates to RPM's. The adaptive learning in the ECU will reset it's closed position. If it doesn't you can force it to adapt. I've done this many times and it works.

 

Can you explain to us how you force the IACV to adapt Higgs?
I've heard of people doing this but I have no idea how.

 

X2 Please

 

Unplug the IAC. Turn key to on position, plug the IAC connector into the IAC. Turn key off. Repeat as needed.

It's really basic, the ECU closes the IAC when you shut the key off, thus shutting the idle circuit down killing the engine with no run on. When the key is turned to the on position the ECU runs the IAC out whatever number of steps the program dictates is idle speed(IIRC it about 21 steps). What you are forcing the ECU to do is re establish ZERO(closed is ZERO steps). An IAC can lose it's ability to accurately count steps, leaving the ECU to lose the ZERO step baseline. Closed = ZERO steps, idle speed is X number of steps out from ZERO. Temp plays a role here too, the ECU may increase or decrease the steps out according to temp. A sticky IAC will cause the ECU to lose ZERO, as the valve sticks but the ECU thinks it is still completing each step.

Make sure the IAC is clean before trying to force it to reset ZERO. If it still sticks any effort to force it to ZERO will be an exercise in futility.

 

Thank you Higgs.

 

Higgs do you have a number I can call you to talk direct for awnsers?

 

I've done just what u just said to do but I can't find the neutral. spot in the iac it will go high then low but when I think I found the neutral spot ill turn it off then on then its locking high again its getting aggravating lol

 

My D1 would idle high. Replaced IACV. Would not "adapt" or "learn" the new part. Swapped out ECU and IACV from donor vehicle. All better. Just a thought.