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Home › Saab › 1996 › 9000 CS, Automatic › Repair and Diagnosis › Transmission › Automatic Trans › Overhaul - ZF 4HP 18 › Testing › Stall Speed Test

Stall Speed Test

  1. Perform stall speed test with A/T at operating temperature. Check engine and A/T fluid to ensure proper levels and condition.
  2. Stall speeds are measured with gear selector in "D" and "1" positions. Parking brake and service brake must be applied fully while performing stall test. Connect an engine tachometer visible to driver.
  3. Start engine, apply parking brake and service brake fully, then shift gear selector to "D" position. Ensure no one is in front or behind vehicle and depress accelerator pedal to floor. Obtain engine RPM reading and release accelerator pedal immediately. Stall speed should be 1900-2400 RPM.
  4. Allow ATF to cool, then repeat test with gear selector in "1" position. To prevent internal damage to A/T, DO NOT  hold stall speed longer than 5 seconds. Stall speed should be 1900-2400 RPM.
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