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Home › Subaru › 1991 › XT6 FWD › Repair and Diagnosis › Engine Performance › Engine Controls - Adjustments › Idle Speed & Mixture › Cold (Fast) Idle › Notes

Cold (Fast) Idle: Notes

NOTE: Fast idle on TBI engines is controlled by air control valve. On PFI engines, fast idle is controlled by auxiliary air valve. Adjustment is not necessary on either system.