High idle, probably broken IAC, questions

[fixkick]

Update: 1991 Vitara MT, 2 door, G16a, 4wd.

Very shortly after experimenting with golf tee I moved the hose on driver's side near driver's right knee and put a moped's fuel valve at the end of the hose to be able to tune the vacuum leak and have RPM control.

cold 200-2200 (fully closed - fully open)
hot  800-2500 (fully closed - fully open)

Note a needle valve would be a lot better for selecting RPM as its designed for gasses, this valve is for liquid so the whole tuning range is around 2-3 degrees of rotation. Bit hard to tune, but it does what is needed.

wow, thanks for sharing all that data.  nobody has done this and posted the results. for building a fake,IAC valve, due to stock valve IAC stuck.(dead or weak)
that gas line valve is prefect. and easy to find too.

the dash gauge water temp uses its own 1 pin sensor and is not used for EFI , not used at all for the ECU for fuel mixing.

nice work and good luck for inspecting, get car hot, turn new valve for 800 rpm and bingo.
as you turn the valve , the ISC will kick in and do RPM controls HOT. to 800. (regulated ISC mode) hot.

i see yours did here. hot >>>> 800-2500 (fully closed - fully open)
 
the 2500 is because your  air leak is more than the ISC can control. 

try 1500 rpm cold see if when hot the ISC wakes up at 150F and goes to 800 like it should.


best wishes and cheers to you !


wow I missed your post before with super nice IAC packing job to take it off line..(leaking bad hot)  great photos those, and the method is perfect.
any method that can be Regressed easy  is best.  (blocking the base gasket also kills the air bleed in top of air horn, and is best to keep that working)