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Idle Adjustments

  1. Disconnect idle speed regulator wire connector. Attach Idle Speed Tester (Ele. AB.99) and Harness Adapter (Ele. CT.02) to idle speed regulator.
  2. Start engine. Push tester switch in extend position and then retract position. Engine speed should change if idle speed regulator is working.
  3. If engine idle speed does not change, remove regulator and watch if valve inside regulator port is working while cycling ISC tester. If not, replace idle speed regulator. See Fig 1 .
Fig 1: Idle Speed Regulator
G54312
CURB IDLE SPEED

Application RPM
3.0L 790