Engine Performance problem
1993 Dodge Shadow 4 cyl Front Wheel Drive Manual 120000 miles
when you start the car when it is cold it will idle at 250 and run rough. But then when it warms up it will idle at 750. If I adjust the idle speed screw it will fix it for a little bit but then it will go back down.
Idle speed is controlled by the engine computer and an idle speed motor(IAC). If you remove it, then turn the key to run it should move. If not the computer, wiring, or motor is N/G. Bring the idle screw back to its original position if you can get it fixed, and clean the inside of the throttle body, including the mounting hole that the idle motor sits in. Let me know how you do, ok?
You'll need a torx setup. The idle speed motor screws are torx head.
Before anything get and record any fault codes. Turn the ignition key on, off, on, off, on. All within 5 seconds and count the flashes that the " check engine" light gives you, ok. These are important.