GM Service Manual Online
For 1990-2009 cars only

    Important: 

       • Do not test stall speed for more than 10 seconds at a time.
       • Stall speed tests should be used for diagnostic purposes only.
       • Stall speed should be the same in D, I, L and R positions.
       • Do not test stall speed with the automatic transmission pressure gage installed.

  1. Engage the parking brake firmly, and block all four wheels.
  2. Connect the scan tool.
  3. Ensure the A/C switch is OFF.
  4. After the engine has warmed to normal operating temperature and the radiator fan turns on, shift to the D position.
  5. Fully press the brake pedal and accelerator pedal for 6-8 seconds, and note the engine speed. Do not move the shift lever while raising engine speed.
  6. Specification
    2400 RPM +/- 150 RPM

  7. Allow 2 minutes for cooling, then repeat the test in the I, L, and R positions.
  8. If the measurements are out of service limit, refer to High Stall Speed in Drive, Intermediate and Low , Stall Speed High in Reverse and Low Stall Speed .