There was a time when a car’s engine idle speed was controlled mechanically by the slight opening of the carburetor’s throttle valve. Ford’s 1999 Escort relied on a fuel-injected throttle body that constantly fed the 2.0-liter engine and accommodated for changing road and weather conditions. The idle was dynamically controlled by an idle air control valve attached to the throttle body. A failing IAC valve can cause the Escort to idle roughly and stall, or become difficult to start. Most of these problems will also be accompanied by a check engine light on the dashboard.
Things You’ll Need
Ratchet, Socket set, Gasket scraper, Torque wrench, OBDII-compliant scan tool