DRIVEABILITY - IDLE AIR CONTROL (IAC) VALVE DIAGNOSTIC SERVICE TIPS
TECHNICAL SERVICE BULLETIN
Reference Number(s): 03-3-5, Date of Issue: February 17, 2003
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
Related Ref Number(s): 03-3-5
ARTICLE BEGINNING
DESCRIPTION
DRIVEABILITY - IDLE AIR CONTROL (IAC) VALVE DIAGNOSTIC SERVICE TIPS
ISSUE
Some vehicles, may exhibit driveability 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 (Fig. 2 ) for all driveability concerns including stalls it will assist the technician making a correct repair the first time.
Perform normal diagnostics.
Nov 13, 2008 at 9:29 AM
