Cosmo Kramer

IIRC default setting is 382 ohms. You can do it on the maf plug as well.

Your ISV is working, set your MAF to baaseline and bump up the idle and see how it goes.

PC-85-928S

I was surprised how little resistance the idle screw on the throttle body had.
I turned it counter clockwise with a rachet initially.
At first it did not seem to have any effect, but then I realized I was not turning it enough.
I would turn it higher, and then take a test drive, and then readjust.
What I am finding is that even if I go to 1100 ish in park in the driveway, when I get to a stop sign it is still going back to 500 ish.
Should I attempt to adjust with it in drive and someone holding the brake.
Or is the bolt supposed to have more resistance?
Or should I go the jumper wire, o2 sensor disconnect route.
Interestingly when I go higher on idle, I hear the whistling slightly returning.

PorKen

If turning up the idle does not help, then there may be other problems, like a worn out Idle Control Valve.


The best way would be to use the jumper, and set the CO and idle at the same time (they are mutually dependent).

PC-85-928S

ICV new
But I did not replace the TPS switch on side of throttle body

WICruiser

With the engine off you should be able to hear a click when the throttle is opened slightly and also when it is slowly returned to idle. I believe you can also confirm that th switch is working by checking at the diagnostic port mentioned early in this thread. I have the procedure somewhere if but will not be home to check it until next weekend.

Roger

WallyP

I have not read that you have adjusted the idle speed correctly...

Look at the front of the engine, on the chassis crossbar, and find the idle stabilizer connector. This is a 1 1/4" round connector, with three electrical contacts under a cover, two on top, one on the bottom. Make a jumper to temporarily connect the contact located at the one o'clock position to the one at the six o'clock position. This kills the idle control circuit.

Look down between the first and second inlet tubes just on the passenger side of center, and find the round flat-slotted screw. Turn this screw to adjust the idle speed to 680 ± 20 rpm. Remove the jumper. If the idle is now steadier, the idle speed may have just been outside the range that the idle speed control could adjust. If there is no difference with the control active or disabled, the idle speed control unit may be bad.