Stall Speed Test

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Block all wheels, set the parking brake and firmly apply the service brake to reduce the risk of vehicle movement during this procedure. Failure to follow these instructions may result in serious personal injury.

NOTE: Carry out the Line Pressure Test prior to carrying out the Stall Speed Test. If line pressure is low at stall, do not carry out the stall test or additional transmission damage will occur. Do not maintain Wide Open Throttle (WOT) in any gear range for more than 5 seconds.

NOTE: After testing each of the ranges, move the selector lever into the NEUTRAL position and run the engine at 1,000 RPM for about 15 seconds to allow the torque converter to cool off before continuing onto the next range.

NOTE: If the engine speed recorded by the scan tool exceeds maximum specified RPM, release the throttle immediately. Clutch or band slippage is indicated.

NOTE: The stall test should only be carried out with the engine and transmission at normal operating temperatures.

NOTE: Prolonged use of this procedure may set DTCs P0712 or P1783. After carrying out the stall speed test, run On-Board Diagnostic (OBD) test and clear the DTCs.

The stall test checks the operation of the following items:

Torque Converter Clutch (TCC)
Forward clutch
Low One-Way Clutch (OWC)
Overdrive (O/D) OWC
Engine driveability concerns

Connect a scan tool.
Press the accelerator pedal to floor Wide Open Throttle (WOT) in each range. Record the RPM reached in each range. Stall speeds should be in the appropriate range.

STALL SPEED CHART

Engine	Min.	Max.
6.0L diesel	2,041	2,334
5.4L gas	1,773	2,151
6.8L gas	1,698	1,977

STALL SPEED DIAGNOSIS CHART

Test Results	Possible Source
Stall speed high - R only	General line pressure concerns O/D OWC Direct Clutch Reverse Clutch
Stall speed high - Overdrive (Circle D)	General line pressure concerns O/D OWC Forward Clutch Low/Reverse OWC
Stall speed high - Manual 3 only	O/D OWC Coast Clutch Forward Clutch Intermediate Clutch
Stall speed high - Manual 2 only	O/D OWC Forward Clutch Low/Reverse OWC Reverse Clutch
Stall speed high - Manual 1 only	Coast Clutch O/D OWC Forward Clutch Low/Reverse OWC Reverse Clutch
Stall speed low - Overdrive (Circle D), D, 3, 2, 1 and R	TCC Engine Driveability Concerns