How do you adjust the idle speed on newer Taurus - Sable?

Answer 1

Idle speed is computer controlled and adjustable.

If the idle is too high or low, that indicates the computer is getting bad readings from a sensor or 3. Engine codes are a good indicator as to where problems might exist and guide diagnostics.

See "Related Questions" below for more ideas...

The only RPM that can be stated is idle, which should be around 700-80 RPM's. While driving, the RPM's are subject to vehicle speed and load. There is no way to state, for example, that in second gear, you should be at such and such RPM, because you might be going uphill with 4 people, and a load of groceries in the car, or even driving into a hard wind. Or you could be going downhill, with the wind. You just don't know. The PCM makes all these decisions electronically. It might even decide, based on load, to downshift the transmission at a time that may seem odd to you, thus making the RPM's flare up a little. There is no stated RPM's at any given speed. The stradegies that the PCM uses are a combination of preprogrammed stradegies, set by engineers, and learned stradegies that the PCM adapts to based on driving conditions, engine wear, and transmission wear.

I raised my idle by the adj. screw on the bottom of the small plate directly under the spring that operates the foot pedal. the computer DOES automatically set the idle,,,,but i raised mine enough manually to where it NO LONGER STALLS OR SHAKES when ....in gear w/brake on. worked for me !

You don't. It is controlled electronically by the PCM using the IAC (idle air control) valve located on the side of the throttle body. If you have an idle problem, it is in that computer controlled system, possibly a faulty IAC, or a sludged up throttle body that needs cleaned.

Try giving the throttle body a thorough cleaning - cures many ills and may even help your problem too.

electronic computer controled

the idle is preset through your tps and idle air control valve its non adjustable