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Fast Idle

  1. Set parking brake and block drive wheels. Warm engine to operating temperature. Install Tachometer (J-26925). Air cleaner must be in place and all accessories turned off.
  2. Remove connector from fast idle solenoid. To energize solenoid, connect jumper wire from battery positive terminal to solenoid terminal. Open throttle to ensure plunger is fully extended.
  3. Adjust fast idle speed by turning plunger hex head. Adjust to specifications. SeeIDLE SPEED (RPM) SPECIFICATIONS  table. Turn off engine. Remove jumper wire and test equipment. Install fast idle solenoid connector.
Fig 1: Adjusting Idle Speed (Diesel)
G90I15733Courtesy of GENERAL MOTORS CORP.
IDLE SPEED (RPM) SPECIFICATIONS

Application Curb Idle Fast Idle
6.2L 650 800
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