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Radiator Fan Relay THROTTLE BODY MINIMUM AIR FLOW CHECK (1) Connect DRBII scan tool. air door vacuum hose. (3) Warm engine in Park or Neutral until the cool- ing fan has cycled on and off at least once. (4) Hook-up timing check device and tachometer. set basic timing to 12°BTDC 6 2°BTDC. (6) Shut off engine. Reconnect coolant temperature sensor. (7) Disconnect the PCV valve hose from the intake manifold nipple. (8) Attach Air Metering Fitting #6457 (Fig. 4) to the intake manifold PCV nipple. (9) Restart the engine, allow engine to idle for at least one minute. (10) Using the DRBII scan tool, Access Min Air- flow Idle Spd in the sensor read test mode. (11) The following will then occur: • Idle air control motor will fully close. • Idle spark advance will become fixed. • Idle fuel will be provided at a set value. • Engine RPM will be displayed on DRBII scan tool. (12) Check idle RPM with tachometer. If idle RPM is within the specifications listed below, then the If idle RPM is not within specification replace throttle body. (13) Shut off engine. take manifold PCV nipple. Reinstall the PCV valve (15) Remove DRBII scan tool. air cleaner assembly. Reinstall heated air door vacuum hose. (17) Disconnect timing check device and tachome- ter. IGNITION TIMING PROCEDURE Refer to Group 8D Ignition System 60-WAY PCM WIRING CONNECTOR Refer to the powertrain control module (PCM) wir- ing connector descriptions for information regarding Fig. 4 Air Metering Fitting IDLE SPECIFICATIONS 14 - 46 FUEL SYSTEMS Ä |