Auto Repair 2000-2003 Ford Taurus Driveability—Idle Air Control (Iac) Valve Diagnostic Service Tips
Issue some vehicles, may exhibit drivability conditions. These may include: • no start • difficult to start • stall • low idle • rough idle • high idle • hesitation/surge while accelerating or at steady speed these conditions may be intermittent with no diagnostic trouble codes (dtc) and no malfunction indicator lamp (mil). In some cases dtc and mil may be evident. Action trouble cannot be identified with 95% of returned idle air control (iac) valves. The following procedure is supplemental information to normal diagnostics to facilitate accurate identification of malfunctioning valves. These symptoms would include engine stall, hard start, crank/no start, idling problems, and idle speed control system related dtc’s. If the service writer uses the attached worksheet (figure 2) for all drivability concerns including stalls it will assist the technician making a correct repair the first time. Iac diagnostic service tips – general never clean an iac valve. Carburetor cleaners and other cleaning agents may temporarily repair the drivability concern, but the long-term functionality of the valve is compromised.
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