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Stall Speed Test

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Apply the parking brake firmly as well as the foot brake while carrying out each stall test.
CAUTION: Carry out LINE PRESSURE TEST  prior to carrying out Stall Speed Test. If the line pressure is low at stall, do not carry out Stall Speed Test or further transmission damage will occur.

The Stall Speed Test checks:

Conduct this test with the engine coolant and transmission fluid at correct levels and at normal operating temperature.

Apply the parking brake firmly for each Stall Speed Test.

  1. Find the specified stall RPM for the vehicle. For additional information, refer to the Stall Speed Chart. Use a grease pencil to mark the RPM on the dial of a tachometer.
    STALL SPEED CHART

    Engine Stall Speed RPM
    4.2L 1,976-2,356
    4.6L 2,125-2,488
    5.4L 2,404-2,842
  2. Connect a tachometer to the engine.
    3. NOTE: If the RPM recorded by the tachometer exceeds the maximum limits, release the accelerator pedal immediately because clutch or band slippage is indicated.
  3. In each of the following ranges (D), 2, 1, R, press the accelerator pedal to the floor and hold it just long enough to let the engine get to wide open throttle (WOT). While making this test, do not hold the throttle open for more than 5 seconds at a time.
  4. Note the results in each range.
  5. After each range, move the shift control selector lever to NEUTRAL and run the engine at 1,000 RPM for about 15 seconds to cool the torque converter before making the next test.
  6. Refer to the stall speed diagnosis chart for corrective actions.
STALL SPEED DIAGNOSIS CHART

Selector Position Stall Speeds High Stall Speeds Low
(D) Planetary One-Way Clutch  
(D), 2 and 1 Forward Clutch or Intermediate Clutch  
(D), 2, 1 and R Carry Out Pressure Test Torque Converter Stator, One-Way Clutch, or Engine Driveability Concerns
R Reverse Clutch or Low Reverse Band or Servo  
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