2004 Chevrolet Tracker RWDFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

IMPORTANT: The operation of the fast idle-up valve affects engine idle speed. The engine must be cold in order to perform a complete inspection of the fast idle-up valve.
  1. Install a scan tool.
  2. Ensure that the engine coolant temperature is 25°C (77°F) or less.
  3. Measure the distance (4) from the case of the fast idle-up valve (3) to the tip of the plunger (2). The distance should be 26.6-27.4 mm (1.048-1.078 in). If the distance is not within 26.6-27.4 mm (1.048-1.078 in) replace the fast idle-up valve. Refer to Throttle Body Assembly Replacement .
    4. Fig 1: Measuring Distance From Case Of Fast Idle-Up Valve To Top Of Plunger
    GM719122Courtesy of GENERAL MOTORS CORP.
  4. Start the engine.
  5. Run the engine until the operating temperature is 52-68°C (126-154°F).
  6. Check that the fast idle cam (2) is no longer contacting the throttle lever fast idle stop (1). If the fast idle cam (2) is still contacting the throttle lever fast idle stop (1), inspect for the correct flow of engine coolant to the fast idle-up valve. If coolant flow is OK, replace the fast idle-up valve. Refer to Throttle Body Assembly Replacement .
  7. Continue to run the engine until the operating temperature is 80°C (174°F) or more.
  8. Turn OFF all accessories.
  9. Check that the engine speed is within 700-800 RPM. If the engine speed is not within 700-800 RPM inspect the operation of the idle air control (IAC) system. Refer to Idle Air Control (IAC) System Diagnosis .
  10. Turn ON the AC and check that the engine speed is 750-850 RPM. If the engine speed is not within 750-850 RPM inspect for a fault in the AC idle-up system. Refer to Electrical/Accessory Load Idle-Up Signal Diagnosis .
    11. Fig 2: View Of Throttle Lever Fast Idle Stop & Fast Idle Cam
    GM719132Courtesy of GENERAL MOTORS CORP.
Chapter Navigation
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.