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Broke off the IAC valve in the throttle body while tightening. How do I get the broken threads out of the throttle body

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  • Cars & Trucks Master
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I broke off the IAC valve in the throttle body in a 1994 GMC Sierra 4.3lt.. need to know how to get it out. Please help!


if accessible from a good angle Need to drill in to the broken part in the throttle body using a drill bit a bit smaller then the IAC thread as close as possible to the throttle body thread U need rethreading tap similar to the IAC valve if available in size and thread run thru to clean the throttle body thread and replace with new one if no access to it need take out throttle body U have to take Ur time.
Good Luck

Dec 21, 2016 | 1994 GMC Sierra

1 Answer

The owners manula say inspect idle speed at 160,000 mi how do you do it


They maybe referring to the IAC valve (idle air control) which is in the side of the throttle body. You can unplug the IAC and then remove from the throttle body.
Most times they are held in the throttle body by two screws. Give them and the throttle body a good spray with throttle body cleaner.

May 28, 2015 | Cars & Trucks

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

2 Answers

95 GMC surburban keeps dying when in low rpm. I replaced the fuel filter and it ran good for a few days, then started crapping out again. I then replaced the spark plugs and wires and it ran great for...


First check for a vacuum leak. Any small loose hoses in the engine compartment? If not, suspect the idle air control valve. I have pasted test procedures for the iac below. Be careful not to confuse the tps with the iac. The tps is centered on the ybro5ttle body. The iac is more on the perimeter. An additional test I do after checking the valve is to plug it back in while it is still off the throttle body and verify that it actuates a little when the key is turned on. It should back up a tad to allow idle air through the passage for starting.

TESTING
Disengage the IAC electrical connector.Using an ohmmeter, measure the resistance between IAC terminals A and B. Next measure the resistance between terminals C and D.Verify that the resistance between both sets of IAC terminals is 20-80 ohms. If the resistance is not as specified, the IAC may be faulty.Measure the resistance between IAC terminals B and C. Next measure the resistance between terminals A and D.Verify that the resistance between both sets of IAC terminals is infinite. If the resistance is not infinite, the IAC may be faulty.Also, with a small mirror, inspect IAC air inlet passage and pintle for debris. Clean as necessary, as this can cause IAC malfunction.


Fig. Fig. 2: Using an ohmmeter, backprobe terminals of the TPS sensor to check for proper resistances



Fig. Fig. 3: The TP sensor and IAC sensor are usually located at the side of the throttle body



Fig. Fig. 4: Idle Air Control (IAC) valve wiring and terminal identification
REMOVAL & INSTALLATION

Disconnect the negative battery cable.Disengage the electrical connection.Remove the IAC valve. On thread-mounted units, use 1 1 / 4 in. (32mm) wrench and on flange-mounted units, remove the screw assemblies.Remove the IAC valve gasket or O-ring and discard it.To install:
Clean the old gasket material from the surface of the throttle body assembly on the thread mounted valve. On the flange-mounted valve clean the surface to ensure proper O-ring sealingInstall the valve with a new gasket or O-ring. Tighten the thread mounted assembly 13 ft. lbs. (18 Nm) and tighten the flange mounted attaching screws to 28 inch. lbs. (3 Nm).Engage the electrical connector to the IAC valve.Connect the negative battery cable.ecd523da-60e9-4928-9b74-9d90b47be2df.gif0996b43f802319fe-tedh1mdkpnm2cwqabpnjpaem-4-2.gif0996b43f802319ff-tedh1mdkpnm2cwqabpnjpaem-4-3.gif0996b43f80219b22-tedh1mdkpnm2cwqabpnjpaem-4-4.gif

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Jul 21, 2017 | 1995 GMC Suburban

1 Answer

Where is the idle air control valve


Here is a web site to show you a picture of what you are looking for: http://www.theautopartsshop.com/auto+car-usa+parts/ford+focus+idle-air-control-valve.html

Here is how to fix it:

  • Unplug the electrical connector on the IAC valve located on the back of the throttle body near the firewall. No tools are needed to unplug the connector. Squeeze the release tab on the plug and pull to remove it.

  • Unbolt the two 8-mm attaching bolts attaching the IAC valve to the throttle body using an 8-mm socket and socket wrench from the socket set. Remove the IAC valve and gasket from the engine compartment.
  • Position the new valve and gasket in place on the throttle body, and bolt it to the throttle body using the 8-mm bolts and the socket and socket wrench. Avoid over-tightening as the throttle body is easily stripped out by over-tightening the fine-thread 8-mm bolts. Plug the electrical connector into the new valve, and push it on until it snaps into place.
  • Turn the ignition key to the run position but do not start it at this time. Unplug the electrical connector once again, and turn the key off.

  • Start the engine, and adjust the minimum air rate by turning the adjusting screw located on the throttle cable side of the throttle body until the idle speed is 650 rpm plus/minus 50 rpm. Turn the engine off, and plug the electrical connector back in--pushing until it clicks into place.

  • Feb 04, 2011 | 2000 Ford Focus

    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

    Need to replace a idle air control valve on a 1999 300M Chrysler


    Removal & Installation
    1. Disconnect the negative battery cable.
    2. Disconnect the IAC electrical connector.
    3. Remove the IAC mounting screws.
    4. Remove the IAC.



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    To install:
    1. Install the IAC to the throttle body.
    2. Tighten mounting screws to 5.1 Nm (45 inch lbs.) torque.
    3. Attach electrical connector to the IAC.
    4. Connect the negative battery cable.
    1. Disconnect electrical connector from IAC motor.
    2. Disconnect air plenum (where applicable).
    3. Remove two mounting bolts (screws).
    4. Remove IAC motor from throttle body.

    3ccd55e.gif

    To install:
    1. Install IAC motor to throttle body.
    2. Install and tighten two mounting bolts (screws) to 60 inch lbs. (7 Nm) torque.
    3. Install electrical connector.
    4. Connect air plenum (where applicable).

    Mar 06, 2010 | 1999 Chrysler 300M

    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 need to know where the idle adjustment screw is on a 92 Saturn SL1 and what wrench to use.


    its located on the throttle body connected to your air intake manifold where your throttle cable connects on the throttle body there is a adjustment screw connected there

    Nov 03, 2009 | 1992 Saturn SL1

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