Stall Speed Test

WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Apply the service and parking brakes firmly while carrying out each stall test.

CAUTION: 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.

CAUTION: After testing each of the ranges, move the range selector 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.

CAUTION: If the engine speed recorded by the tachometer 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 diagnostics 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 OWC
Engine driveability concerns

Connect a tachometer to the engine.
Press the accelerator pedal to floor (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	2,091	2,401
5.4L Gas	1,824	2,151
6.8L Gas	1,753	2,060

STALL SPEED DIAGNOSIS CHART

Test Results	Possible Source
Stall speed high - R only	General line pressure concerns Overdrive OWC Direct clutch Reverse clutch
Stall speed high - (D)	General line pressure concerns Overdrive OWC Forward clutch Low/Reverse OWC
Stall speed high - Manual 3 only	Overdrive OWC Coast clutch Forward clutch Intermediate clutch
Stall speed high - Manual 2 only	Overdrive OWC Forward clutch Low/Reverse OWC Reverse clutch
Stall speed high - Manual 1 only	Coast clutch Overdrive OWC Forward clutch Low/Reverse OWC Reverse clutch
Stall speed low _ (D), D, 3, 2, 1 and R	Torque converter clutch (TCC) Engine driveability concerns