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Ford Tempo High Idle

Q. Dear Mr. Ciulla, I just recently changed the O2 and the idle air valve on my fathers 1992 Ford Tempo with a 2.3 liter 4 cylinder in it. Reason for the change was the car was idling very rough. When I changed the O2 sensor it helped a little then when I changed the idle air valve It started fine and the idle was smooth, however we can't get it to idle down.

When you start it up it automatically idles up to like 2,000 rpm. The vehicle doesn't have an rpm gauge but having some mechanic background I know it is definitely up there. We tried messing with the Throttle Position Sensor finally buying a new one hoping that would fix the problem, but it didn't. Any ideas as to why the vehicle won't idle down.

Sincerely,
Christian
Grand Forks, ND

A. I think there was nothing wrong with the IACV in the first place. I think it was just a matter of a dirty throttle body.

I would check to make sure there are no vacuum leaks first and then clean the throttle body. When you are done, disconnect the negative battery terminal for five minutes or more. Drive the the vehicle for at least ten miles to allow the Electronic Control Assembly (ECA) to relearn the values for optimum performance.

Cleaning Throttle Bodies

NOTE: During the ten mile relearn drive, the vehicle may exhibit some driveability symptoms. These should be eliminated when the Keep Alive Memory (KAM) has relearned the operating values.

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