Torque Converter Clutch Diagnosis

If the stator roller clutch becomes ineffective, the stator assembly freewheels at all times in both directions. With this condition, the vehicle will have poor acceleration from a standstill. At speeds above 30-35 mph, the vehicle may act normal.

If the vehicle has poor acceleration, it should first be determined that the exhaust system is not obstructed, the engine is performing properly and that the transmission is starting in first gear. If the engine will freely accelerate to a high RPM in Neutral, it can be assumed that the engine and exhaust system are normal.

If the stator roller clutch remains locked up at all times, the engine RPM and vehicle speed will tend to be limited at high speeds. Vehicle acceleration from a standstill will be normal. Also, under this condition engine overheating may be encountered. Visual examination of the torque converter may reveal a bluish color as a result of the overheating.

If the converter has been removed from the vehicle, the stator roller clutch can be checked by inserting a finger into the splined inner race of the roller clutch and trying to turn the race in both directions.

The inner race should turn freely in the clockwise direction but not turn or be very difficult to turn in the counterclockwise direction.

Do not use the pump cover stator shaft as the results may be misleading.