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Converter Clutch Test

NOTE: Ensure engine coolant temperature is above 128°F (53°C) and below 240°F (116°C). Due to the difficulty of feeling converter clutch shift, a tachometer and/or vacuum gauge must be connected to engine.
  1. To check converter for engagement and disengagement, drive vehicle at approximately 50 MPH. While maintaining this speed, lightly tap brake pedal. Engine RPM and vacuum should increase when clutch disengages, with light brake pedal application.
  2. Engine RPM will decrease when pedal is released and clutch engages. If converter clutch does not engage or is engaged continuously, see AUTO TRANS DIAGNOSIS - FORD A4LD article.
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