Operation CHARM: Car repair manuals for everyone.

Stall Speed, Measurement

NOTE: To be carried out in conjunction with check of line pressure. Never test stall speed if line pressure is too low. Stall speed test gives an indication of condition of torque converter and transmission clutches.

Test Conditions
- engine must be properly tuned
correct line pressure
- correct oil level and transmission at normal operating temperature.





1. Connect tachometer to engine. Place tachometer on dashboard.
2. Start engine. Apply parking brake and brake heavily with left foot.
3. Engage position D and depress accelerator to floor. Record highest engine speed and line pressure.

CAUTION: Do not depress accelerator for more than 5 seconds.





Position D, Line Pressures

4. Allow engine to idle in position N for 30 sec
5. Engage reverse and repeat test.




Position R, Line Pressures


Engine type Stall speed r/s r(min)
B 21 A 36,7 (2200)
B 23 E 40,0 (2400)
B 21 F 41,7 (2500)
B 21 F MPG 30,0(1800) AW70
B 21 F LH 33,0(1980) AW70
B 21 FT 37,0 (2220) AW71
B 21 FT 34-41(2050-2500) AW71
B 23 F 37,0 (2200) AW70
B 27 A/E/F; B 28 A 36,7 (2200)
B 28 E/F 40,0 (2400)
D 24 36,7 (2200)

NOTE: 35,0 (2100) for 1208254-027 and 1208 253-376. 238,3 (2300) for 1208128-011 and 1208 164-021 for B27E and F and 1208046-007 for B27F.


Incorrect Stall Speeds
High Stall Speed
Probable cause: incorrect oil level or blocked oil filter.

High stall speed with screech in position R
Probable cause: slipping C2 clutch and B3 brake.

High stall speed with screech in positions D1 and D2
Probable cause: Slipping C1 clutch.

Low stall speed
Probable cause: insufficient power delivered by engine.

Low stall speed, poor acceleration at low speeds (Normal after 70 km/h 42 mph)
Probable cause: defective torque converter.