Stall Speed Test
WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 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:
- Torque converter clutch operation and installation.
- Holding ability of the forward clutch.
- Reverse clutch (the low/reverse bands).
- Planetary one-way clutch.
- Engine driveability.
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.
- Find the specified stall rpm for the vehicle. Refer to the Stall Speed Chart.STALL SPEED CHART
Engine Stall Speed RPM 5.4L (3V) 2,288-2,734 - Connect a scan tool.
- In each of the following ranges Overdrive (Circle 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.
- Note the results in each range.
- 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.
- Refer to the Stall Speed Diagnosis Chart for corrective actions.STALL SPEED DIAGNOSIS CHART
Selector Position Stall Speeds High Stall Speeds Low Overdrive (Circle D) Planetary One-Way Clutch Overdrive (Circle D), 2 and 1 Forward Clutch or Intermediate Clutch Overdrive (Circle 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
NOTE:
If the rpm recorded by the scan tool exceeds the maximum limits, release the accelerator pedal immediately because clutch or band slippage is indicated.