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lrstrt
lrstrt 1/30/2013
1999 Mercury Sable LS 6Cyl3.0L - Engine
when putting car in park why does it accelarate very high
the odometer reads very high like its racing
1 Answer
  • CVO
    CVO 1/31/2013
    Idle air control valve.

    The Idle Air Control (IAC) valve controls the engine idle speed and dashpot functions. The valve is located on the side of the throttle body. This valve allows the necessary amount of air, as determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal, to bypass the throttle plate in order to maintain the proper idle speed.
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