Stall Speed Test

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Carry out the LINE PRESSURE TEST prior to the STALL SPEED TEST . If line pressure is low, 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 exceeds maximum specified rpm, release the accelerator pedal immediately.

NOTE: Only perform the stall speed test with the engine and transmission at normal operating temperatures.

The Stall Speed Test checks the operation of the following items:

Torque converter reactor One-Way Clutch (OWC)
Forward clutch
Low OWC
Overdrive OWC
Engine driveability concerns

Connect a scan tool.

Press the accelerator pedal to WOT in each range. Record the rpm reached in each range. Stall speeds should be in the appropriate range.

STALL SPEED

Engine	Drive	Reverse
Diesel	1, 600-1, 750 rpm	1, 800-2, 000 rpm
Gas	2, 100-2, 300 rpm	1, 900-2, 200 rpm

STALL SPEED DIAGNOSIS CHART

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