Originally Posted by tke148
How can the cold idle value be adjusted?
There is a linkage from the cold idle plunger with an adjustment screw. The cold idle plunger and linkage is down under the left side of the TB. There are also scribe marks on the linkage, most likely no longer visable because of corrosion. Adjust the linkage as necessary to obtain your desired cold start idle speed. Mine is set to approx. 1500 RPM.
To set a proper idle speed and help eliminate the hang.
Get the car completely up to operating temp. Drive it!
With the engine off, disconnect the TPS. Make sure all accessories are off.
Start the engine and set the throttle body set screw
to obtain ~550 RPM's in park or neutral.
Turn off the engine and reconnect the TPS.
Restart the engine and make sure idle speed is within spec. ~650. If it's not, adjust the IACV to obtain the correct idle speed.