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Home >> Ford >> 1992 >> Explorer 2D Utility, RWD, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Overhaul - A4LD >> Testing >> Governor Pressure Test

Governor Pressure Test

  1. Raise vehicle until drive wheels clear ground. Disconnect and plug vacuum line to vacuum diaphragm unit. Connect a vacuum pump to vacuum diaphragm unit.
    CAUTION: DO NOT  exceed 60 MPH speedometer reading. After each test, move selector lever to Neutral position and run engine at 1000 RPM for 15 seconds to cool transmission.
  2. Place transmission in "D" position. Apply 10 in. Hg to vacuum diaphragm with no load on engine. Increase speed slowly and watch speedometer. Note speed at which control pressure cut-back occurs.
  3. Pressure cut-back should occur between 5-15 MPH. Decrease vacuum to 0-2 in. Hg and repeat test. Control pressure cut-back should occur at 7-20 MPH. Governor is okay if cut-back occurs as specified.
  4. If cut-back does not occur as specified, check shift speeds to verify problem is in governor and not due to stuck cut-back valve. See SHIFT SPEED TEST . Repair or replace governor as necessary.
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