Where is the idle located on a 1994 Mitsubishi eclipse gs?

Answer 1

3 places idle is controlled on 94 Eclipse GS:

Fast idle (when cold) is controlled by a passage built into the throttle body (at the bottom). As the engine heats up, warm coolant moves a diaphragm and the fast idle returns to normal idle slowly.

Regular idle: Is computer controlled. An "IAC" motor located also at the bottom of the throttle body is controlled by the engine computer to set the idle. These often fail. When they do, they sometimes damage the control circuits in the computer. If you replace the IAC and the computer still cannot control the idle, this may be the case.

Base idle: Normally you dont mess with this! But if your IAC fails and you need to limp it around for a while without a new IAC, the base idle can be turned up. Technically, this can cause the car to fail emissions. Base idle screw is under the little black cap (if still there) at the top of the throttle body looking at you if you are staring at the engine. Its right out in the open at the very top. Turn counterclockwise to raise the idle. Go in 1/4 to 1/2 turn increments.

If you are going more than 2 turns, something else is wrong.