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Home >> Subaru >> 1991 >> XT Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Fast Idle & Idle-Up Control Device (JUSTY PFI)
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Fast Idle & Idle-Up Control Device (JUSTY PFI)

Using a hand vacuum pump, check to see if control device will hold vacuum. On models equipped with A/C, ensure idle speed increases when A/C is turned on. On models without A/C, idle speed should increase when headlights, rear defogger or heater blower is turned on. See Fig 1 .

Fig 1: FICD Control Actuator
G90H22050Courtesy of SUBARU OF AMERICA, INC.