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Which condition is called stall in a torque converter?

  • A.The stator freewheeling, at which point the converter ceases to multiply and acts as a plain fluid coupling
  • B.The turbine held stationary with the impeller driven
  • C.The engine stopping because the converter is unable to transmit the torque demanded of it by the transmission
  • D.The lock-up clutch slipping

Answer: B

Stall occurs with the brakes on and the throttle open, and it is the condition of maximum torque multiplication, typically around two to one. Stall speed is the engine speed reached in that condition. A stall test reveals converter and transmission faults. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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