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Home >> Ford >> 1991 >> Probe LX, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System/Component Tests - 3.0L >> Idle Control System
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Idle Control System

NOTE: See Idle Air Control Valve (IAC) and Idle Speed Control Solenoid (ISC) test procedures under SOLENOIDS. Curb idle and fast idle speed is controlled by the ECA, and is not adjustable. Some throttle bodies have a sludge-tolerant design with a special coated throttle bore. A Yellow/Black warning decal on these units warns against backing off throttle plate adjustment screw to avoid throttle plate sticking in bore. Faults in idle control system components or circuit should set a service code. See Quick Test procedure in the appropriate TESTS W/CODES article.
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