Stall Speed Test
WARNING:
Apply parking brake FIRMLY while carrying out each stall speed test.
CAUTION:
Always perform HYDRAULIC PRESSURE TESTS
before performing stall speed test. If line pressure is too low at stall speed, DO NOT attempt to perform stall speed test. Further transaxle damage will occur.
CAUTION:
Do not maintain WOT in any range for more that 5 seconds. After testing ranges "D", "2", "1" and "R", move gear selector lever to "N" position and run the engine at 1000 RPM for about 15 seconds to allow the torque converter to cool. If at any time engine RPM exceeds maximum specified RPM, release accelerator pedal immediately. Clutch or band slippage is indicated.
NOTE:
Prolonged stall speed testing procedures may set DTCs P0712 and P1783. After test is complete, run On Board Diagnostic (OBD) test and clear DTCs. See FORD 4F27E ELECTRONIC CONTROLS article.
Stall speed test checks operation of following items:
- Engine performance.
- Forward clutch.
- Low one-way clutch assembly.
- Torque converter clutch.
Connect tachometer to engine. Press accelerator to floor (WOT) in each gear range (except Neutral). Observe and record RPM reached in each range. Stall speeds should be as specified in STALL SPEED SPECIFICATIONS table.
STALL SPEED SPECIFICATIONS
| Engine | Stall RPM | |
|---|---|---|
| 2.0L SPI | 2406-2811 | |
| 2.0L ZETEC | 2439-2837 | |
If stall speeds were too high, see STALL SPEED DIAGNOSIS table. If stall speeds were too low, check engine idle speed. If engine idle speed is within specification, remove torque converter and check torque converter one-way clutch for slippage.
STALL SPEED DIAGNOSIS
| Gear Selector Lever Position | Possible Causes | |
|---|---|---|
| "D", "2" & "1" | Forward Clutch Slipping | |
| "2" Only | Intermediate/Overdrive Band Slipping | |
| "1" & "R" | Low/Reverse Clutch Slipping | |
| "R" Only | Reverse Clutch Slipping Or Low/Reverse Clutch Defective | |