To test idle contol on a1997 F250, ensure that the "check engine" light is on, disconnect the IAC valve, and turn the ignition, you can then turn off the ignition and reconnect the IAC valve.
It is bolted to the bottom of the throttle body.
Change idle speed contol sensor Uncool the battery for five minutes to reset the computer.
1994bmw318i check the idle soleniod
check Idle Air Contol. Refer to the following website for cleaning instructions. http://www.geocities.com/adamk01452/IAC_Clean.html
possible cause of high idle could be that your idle contol switch / valve has carbon build up on it. remove and clean with carburetor cleaner. let it dry completely before re-installing it. idle should come down if not it has probably gone bad and need to be replaced.
P1506 - Idle Air Control System At Adaptive ClipCheck for vacuum leaks and clean the throttle body, maybe check the iat and maf sensors.
Fuel Fail 47 Idle speed contol valve - coil 2: Open or short circuit.
Your Idle Air Contol valve (IAC) may need to be cleaned. Refer to the following website for instructions http://www.geocities.com/adamk01452/IAC_Clean.html
have your timing checked it sounds like it out
check your idle air control valve and/or your TPS
Idkkkk
Hi, When my '97 3.9l did the same thing, I ended up repalcing the IAC (Idle air contol solenoid) Its held on by 2 screws on the back side of the throttle body. If you change it, make sure you clean the hole out where the plunger goes with carb cleaner. Good luck .....