Stall Speed Test

NOTE: After each test, shift transaxle into Neutral and run engine for at least 2 minutes to cool torque converter and transmission fluid.

CAUTION: DO NOT maintain Wide Open Throttle (WOT) in any gear for more than 5 seconds. If engine RPM exceeds maximum specified stall speed, release accelerator immediately. Clutch or band slippage is indicated.

The stall speed test checks the operation of the following items:

Converter One-Way Clutch
Forward Clutch
Low Intermediate Clutch
Low One-Way Clutch
Low Intermediate One-Way Clutch
Engine Performance

Apply service and parking brakes. Connect tachometer to engine, and record RPM reached in each gear selector range (except Neutral and Park) at WOT. Stall speed should be as indicated in STALL SPEED SPECIFICATIONS .

STALL SPEED SPECIFICATIONS

Application		Stall RPM
1995
3.0L (2V) V6		1870-2196
4.6L V8		1921-2293
1996
3.0L (2V) V6		1860-2200
3.0L (4V) V6		1940-2300
3.4L SHO V8		2860-3240
4.6L V8		1877-2254

If stall speeds exceed specification, ensure engine is mechanically okay and tuned to specification. If engine is okay, remove torque converter and check torque converter one-way clutch for slippage.
If stall speed is too high in "OD", "D" for 1996 Taurus and Sable or "OD", "D" and "1" for all other models, the following components may be faulty:
- Forward Clutch
- Low One-Way Clutch
- Low-Intermediate Clutch
- Low-Intermediate One-Way Clutch
- Low-Intermediate Band or Servo
If stall speed is too high in "R", the following components may be faulty:
- Forward Clutch
- Low One-Way Clutch
- Low-Intermediate One-Way Clutch
- Reverse Clutch