Question about 1999 Ford Expedition

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I can't locate the IAC or idle air control valve in my 97 ford expidition 4.6l v8 triton. can anyone help me w/ this? Tnx & more power..

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I.A.C sit in top on T.B.I. it's held on by two 8mm bolts, remove bolts clean surface replace gasket and reinstall sensor.

Posted on Nov 27, 2009

  • Deano Jan 30, 2011

    Right on!

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1 Answer

How do you adjust the idle on a 1997 ford f150 4.6l Triton?


I believe the idle is controlled by the idle air control valve (iac), not sure when they switched to it in the late 90's. Also, if its dying after startup up, check around throttle body for an (iac) and it will most likely be cylinder shaped and have one electrical connecter.

Jul 04, 2014 | 1998 Ford Explorer

1 Answer

Can the idle air control be tested


Idle Air Control Valve

Print


OPERATION

The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the side of the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed.
Do not attempt to clean the IAC valve. Carburetor tune-up cleaners or any type of solvent cleaners will damage the internal components of the valve.


TESTING

See Figure 1

0900c152801e4967.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: The IAC can be monitored with an appropriate and Data-stream capable scan tool

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the wiring harness from the IAC valve.
  3. Measure the resistance between the terminals of the valve.

Due to the diode in the solenoid, place the ohmmeter positive lead on the VPWR terminal and the negative lead on the ISC terminal.
  1. Resistance should be 6-13 ohms.
  2. If resistance is not within specification, the valve may be faulty.


REMOVAL & INSTALLATION

  1. Disconnect the negative battery cable.
  2. Detach the IAC solenoid connector.
  3. Remove the 2 retaining bolts and remove the IAC solenoid and gasket from the throttle body.
  4. Installation is the reverse of the removal procedure. Use a new gasket and tighten the retaining bolts to 71-97 inch lbs. (8-11 Nm).

If scraping is necessary to remove old gasket material, be careful not to damage the IAC solenoid or the throttle body gasket surfaces or drop material into the throttle body.
See Figure 2

0900c152801e4968.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: IAC solenoid location-4.6L engine

Jul 12, 2012 | 1992 Mercury Grand Marquis

1 Answer

Diagnostics test says idle air control underspeed error? how do i fix 1999 ford explorer


change the idle air control valve.

Idle Air Control (IAC) Valve OPERATION The Idle Air Control (IAC) valve controls the engine idle speed and dashpot functions. The valve is located on the side of the throttle body. This valve allows air, determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal, to bypass the throttle plate in order to maintain the proper idle speed. Fig. 1: Typical Idle Air Control (IAC) valve which is mounted to the throttle body - cutaway view shows air bypass direction 89684g16.gif
--- REMOVAL & INSTALLATION
  1. Disconnect the negative battery cable. To remove the IAC valve, first disconnect the negative battery cable, then the IAC wire harness plug 89684p03.jpg
    Next, remove the two IAC valve attaching bolts . . . 89684p04.jpg
    . . . and pull the valve from the intake manifold 89684p05.jpg

  2. Disengage the wiring harness connector from the IAC valve.
  3. Remove the two retaining screws, then remove the IAC valve and discard the old gasket. To install: When installing the valve, always discard the old gasket and install it using a new one 89684p06.jpg

  4. Clean the IAC valve mounting surface on the throttle body of old gasket material.
  5. Using a new gasket, position the IAC valve on the throttle body. Install and tighten the retaining screws to 71-106 inch lbs. (8-12 Nm).
  6. Attach the wiring harness connector to the IAC valve.
  7. Connect the negative battery cable.
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Oct 15, 2010 | 1999 Ford Explorer

1 Answer

How to remove a idle air control valve is windstar 2001


Idle Air Control Valve The Idle Air Control (IAC) valve is located on the air intake plenum.


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Removal & Installation
Disconnect the battery ground cable.
Disconnect the Idle Air Control (IAC) electrical connector.
Remove the bolts and the IAC valve.
Discard the gasket.
To install:
Install a new gasket and position the IAC valve.
Torque the retaining bolts to 8 ft. lbs. (11 Nm).
Attach the electrical connector.
Reconnect the battery ground cable.

May 23, 2010 | 2001 Ford Windstar

1 Answer

How do i remove and clean the IAC


Operation

The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the side of the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed. Do NOT attempt to clean the IAC valve. Carburetor tune-up cleaners or any type of solvent cleaners will damage the internal components of the valve.
The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed.
Removal & Installation

  1. Disconnect the negative battery cable.
  2. Detach the IAC solenoid connector.
  3. Remove the two retaining bolts and remove the IAC solenoid and gasket from the throttle body.
  4. Installation is the reverse of the removal procedure. Use a new gasket and tighten the retaining bolts to 71-97 inch lbs. (8-11 Nm).

Nov 28, 2009 | 1999 Mercury Grand Marquis

1 Answer

I can't find the IAC valve in my 97 ford expidition 4.6l v8, & I don't know what it's looklike either! can anyone be of help? Tnx a lots!!


first of all i do not know but give these websites a try www.autozone.com and www.alldatadiy.com if all fails stop by your local Ford dealership in the parts department and they be able to print you off pictures and diagrams showing you where it goes and what it look like wish you the best of luck Michigan Man

Nov 27, 2009 | 1997 Ford Expedition

2 Answers

Idle air bypass vaule


The Idle air control valve (IAC) is on the back of the throttle body housing on the 4.6 V8, it's half the size of a can of Red Bull. Try tapping on it with a small hammer and if the truck clears up then it's time to replace the IAC.
You can clean it with Throttle body injector but that's just a quick fix for now. Good luck and hope this helps.

May 29, 2009 | 2003 Ford Expedition

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