Engine Controls - No Start/Hard Start/Rough Idle: Overview

Article No.
03-3-5

02/17/03

DRIVEABILITY - IDLE AIR CONTROL (IAC) VALVE
DIAGNOSTIC SERVICE TIPS

FORD:
2000-2003 TAURUS
2002 THUNDERBIRD
2000-2003 EXPLORER, RANGER
2001-2003 EXPLORER SPORT TRAC, EXPLORER SPORT

LINCOLN:
2000-2002 LS

MERCURY:
2000-2003 SABLE, MOUNTAINEER

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 worksheet (Figure 2) for all drivability concerns including stalls it will assist the technician making a correct repair the first time.

Perform normal diagnostics.

SERVICE INFORMATION

NOTE
IT MAY NOT BE POSSIBLE TO DUPLICATE THE CUSTOMER CONCERN. ALTHOUGH THE CONDITION MAY NOT BE DUPLICATED, IT IS RECOMMENDED THAT ANY EVALUATION OF THE IAC VALVE BE DONE IN ACCORDANCE WITH THE FOLLOWING SERVICE PROCEDURE.

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 602300 603300, 607000, 607400, 607700, 608000, 608400, 611000, 618400, 619400, 698298





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