3000GT SL V6-2972cc 3.0L DOHC MFI (1997)
Torque Converter: Testing and Inspection
CONVERTER STALL TEST
NOTE: Stall test consists of determining maximum engine speed obtained at full throttle in "D" and "R" positions. This test checks torque converter
stator overrunning clutch operation, and holding ability of transmission clutches and low-reverse brake.
CAUTION: During this test, make sure that no one stands in front of, or behind, vehicle.
1. Check the transmission fluid level, fluid temperature and engine coolant temperature.
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Fluid level: At "HOT" position on dipstick
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Fluid temperature: 70-80° C (158-176° F)
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Engine coolant temperature: 80-90° C (176-194° F)
2. Apply chocks to both rear wheels.
3. Attach engine tachometer.
4. Apply parking and service brakes fully.
5. Start engine.
6. With selector lever in "D" position, depress accelerator pedal fully to read engine maximum rpm. Do not hold throttle wide open any longer than is
necessary to obtain maximum engine rpm reading, and never longer than 5 seconds at a time. If more than one stall test is required, operate engine
at approximately 1,000 rpm in neutral for 2 minutes to cool transmission fluid between tests.
Standard value: 2,200-3,200 rpm
7. Place selector lever to "R" position and perform stall test by the same procedures above.
Stall Speed Above Specification in "D"
If stall speed is higher than specification, rear clutch or overrunning clutch of transaxle is slipping. In this case, perform hydraulic test to locate
cause of slippage.
Stall Speed Above Specification in "R"
If stall speed is higher than specification, front clutch of transaxle or low-reverse brake is slipping. In this case, perform hydraulic test to locate
cause of slippage.
Stall Speed Above Specification in "D" and "R"
If stall speed is lower than specification, insufficient engine output or faulty torque converter is suspected. Check for engine misfiring, ignition
timing, valve clearance etc. If these are good, torque converter is faulty.
