Question about 1990 Ford Econoline
The Idle Air Control (IAC) valve controls the engine idle speed and dashpot functions. The valve is located on the throttle body on. This valve allows air to bypass the throttle plate. The amount of air is determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal.
Fig. 1: Cleanable IAC valve — 5.0L engine version shown, others similar
Fig. 2: Non-cleanable IAC valve — 5.0L engine version shown, others similar
TESTING OBD-I System
REMOVAL & INSTALLATION Fig. 1: Idle air control valve mounting — 4.9L engine version shown, others similar
Fig. 3: Loosen the idle control solenoid retaining screws
Fig. 4: Remove the idle air control solenoid from the throttle body
Posted on Aug 01, 2010
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Posted on Jan 02, 2017
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