Checking the IAC

[top_end95]

I was wanting to know where the IAC is located and how I would go about testing it.
Any info would be greatly appreciated.

Thanks

 

[versatilx1]

Test & Fix: Either the idle air control (IAC) has an open winding or it is
stuck. Remove the air intake duct and put duct tape over the air by-pass
opening to the IAC. Install the air intake duct and start the engine. If the
idle is back down to normal, check the resistance of the 4 windings in the
IAC. To check resistance of the 4 windings, unplug the 6-way connector from
the IAC. Consider the 6-way connector as 2 rows of 3 cavities. Connect one
ohmmeter lead to one of the center pins in a row of 3 cavities. To check the
first winding, connect the other lead to a pin on either side of that center
pin. Normal resistance is 29-35 ohms at ambient temperature. To check the
second winding move the outer lead to the pin on the opposite side of the
center pin that is connected to the ohmmeter. To check the third and fourth
winding check the other row of 3 in the same way. Replace the IAC if any of
the windings are not 29-35 ohms
see if this helps, on some of the older ones the IAC would go bad and take
out the computer or the computer would go bad and take out the IAC, and
those late eighty / early ninties Mitsu computers were spendy and went out
often The Idle Air Control Motor also known as isc is underneath your throttle body hope this helps

 

[top_end95]

The ISC and IAC are the same thing?

 

[versatilx1]

yeah in 1g's they tend to use different terminology they say iac and for 2nd gen they say isc but there the same thing

 

[top_end95]

I got 30-31 ohms in all pairs of the ISC/IAC.
My car likes to idle at 1,100-1,200 and drop down to almost 500 RPM when the AC is on.

Im currently in the last step of these instructions, 6v battery and jumper wires to the ISC.
http://dmtalon.v8eaters.com/ISC.html

 

[versatilx1]

basically when you turn the ac on the isc motor [pulls off or backs off to keep the engine from stalling you can try this worked for me unplug your battery for 5 to 10 mins then adjust your screw sometimes the o-ring could be bad you can replace that

 

[top_end95]

By screw, you mean the BISS?
So the o-ring could cause the the idle to drop when the AC is on?

 

[versatilx1]

yes sir sorry for the wording im at work and im typing 6 million things on here ya know, i hope this is helped you a tad, and from yes thats what i did on mine and it was fine after

 

[top_end95]

I just tried taking the BISS screw out to check the o-ring, but I couldnt get the screw all the way out. Is there a trick to it?

 

[versatilx1]

is the threading all tweaked out man? if so shit i dont know mine came off simple

 

[top_end95]

Once it gets to the very top, it just spins.

 

[versatilx1]

http://dsmtuners.com/forums/showthread.php?t=189661&highlight=BISS+Screw
i looked this up for you it should cover it

 

[top_end95]

Thanks!

 

[versatilx1]

ok now if its stripped heres a thread i found for you i dont know if you got it in my message buthere you go http://dsmtuners.com/forums/showthread.php?t=39847&highlight=BISS+Screw+stripped

 

[top_end95]

Thanks a lot! Youve been very helpful