Isc Help Please

[srGS-t]

OK I'm new to dsm but can anyone tell me how to check and where the ISC is.....i think it is messed up cause sometime the car will freak out and jump around on the rpms and it wont idle all right all the time SO could anyone help me out.

 

[Cool Mr Steve]

It's on the throttle body, under the throttle body elbow pipe. I can't don't have a picture of it on the car, but you can figure it out from this picture. Take off the connector and there will be 3 pins on top and 3 pins on bottom. On the top, test the resistance between 1 and 2, and 2 and 3. On the bottom test between 4 and 5, and 5 and 6. I believe none of the values should be over 30k ohms. If they are (or if you don't get a reading for the resistance) it is broken and needs replacing. Have fun!

 

[ericbev]

Here is the definitive idle surge page.
http://www.dsm.org/how-tos/tttt/tttt3.html

Here are some pics of where the isc is and how to remove it.
http://www.crebotech.com/page3.html

 

[97GST_Spydr]

First, check your "BISS" screw. -Base Idle set screw > (see below);

...then to check your Idle Speed control (servo motor);

the ISC or IAC connectors are;

(TOP) -where 6 wire connector tab lock is)


! !
-------
1 2 3

4 5 6
-------


Check motor...Use a 6 Volt Lantern Battery ($3-$4)
to test motor (it will move or vibrate),

---to test; connect battery (+) and (-) to connectors 2-5 and 3-6.

check coils;

> the ohms test are 28-32 ohms on the connectors,

> I tested connectors 1-2 2-3 4-5 5-6


NOTE: always CHECK your "BISS" screw first, (its the Idle adjustment screw on top)
>>> I made this mistake, and wasted time checking my ISC stepper motor first,
then buying a junkyard part, ---when all that was wrong was a loose BISS screw (argh!)