The throttle body is the part attached to the intake manifold immediately after air intake hose.
The IAC is the part on front upper part of intake manifold with 2 coolant hoses and a 2-wire connector.
If any or both of these are dirty inside, they would cause erratic idling in instances of the AC cutting in or when decelerating after revving the engine.
These items tends to get dirty over time and affect the idling.
Remove the intake hoses and spray some carb cleaner into the throttle body and with the aid of a rag, scrub the internal part clean. The throttle plate has to be opened to clear the area surrounding the resting position of the throttle plate.
With throttle plate closed, you would see 2 ports inside the throttle body, spray some carb cleaner into them and let it soak for a while.
If you spray in a lot of cleaner, wait for at least 1/2 an hour before attempting to start. Initial starting after using carb cleaner would be difficult and might run rough briefly.
Remove the idle adjust screw and clean it. Spray carb cleaner into the screw port to clean it.
With engine running, spray some cleaner into the ports to clean the IAC and FITV. You would need to feather the throttle slightly to prevent stalling, which would occur due to the carb cleaner causing a rich condition.
Tuesday, November 24th, 2009 AT 4:45 PM