Question about Cars & Trucks

3 Answers

What Is A IAC Sensor? - Cars & Trucks

Posted by on

Ad

3 Answers

  • Level 1:

    An expert who has achieved level 1.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 9 Answers

Iac stands for idle air control

Posted on Apr 19, 2017

Ad

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Cars & Trucks Master
  • 42,769 Answers

Idle air control sensor

Posted on Apr 19, 2017

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Master:

    An expert who has achieved Level 3.

  • Cars & Trucks Master
  • 923 Answers

Idle Air Control valve. But that is not a sensor! Also there is such a thing as an IAT sensor, but that means Intake Air Temperature sensor ... which is usually a thermistor, or temperature-dependent resistor.

Posted on Apr 19, 2017

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Where is the throttle position sensor on my 2004 4.2


S&T Series Blazer, Bravada, Envoy, Jimmy, Rainier, Trailblazer, Xtreme
Throttle Position Sensor (TPS)

Print


Removal & Installation

  1. Remove the idle air control (IAC) electrical connector (1) from the IAC sensor (4).
  2. Remove the manifold absolute pressure (MAP) sensor electrical connector from the MAP sensor.
  3. Remove the water pump belt cover.
  4. Remove the TP sensor retaining screws electrical connector (2) from the TP sensor (3).
  5. Remove the TP sensor electrical connector (2) from the TP sensor (3).

    0996b43f80202874.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Detaching electrical connectors prior to TP sensor removal


    0996b43f80202875.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Identifying components for removal of the TP Sensor


To install:
  1. Install the new O-ring on to the TP sensor.
  2. Connect the TP Sensor electrical connector (2) to the TP sensor (3).
  3. Install the TP sensor (2) on to the throttle body (1). Tighten the TP sensor screws to 2.3 Nm (20 inch lbs.).
  4. Connect the IAC electrical connector (1) to the IAC sensor (4).
  5. Connect the MAP sensor electrical connector to the MAP sensor.
  6. Install the water pump belt and tensioner cover.
  7. Perform the TP Sensor learn procedure:
  8. Turn the ignition to the RUN/ON position.
  9. Wait 1 minute.
  10. Turn the ignition to the LOCK/OFF position

Jul 31, 2012 | 2004 GMC Envoy

2 Answers

Stalls while in drive with foot on brake , changed MAP Sensor, Crank Shaft Sensor , Distributor, Fuel Pump, Fuel Filter , have ran out of ideas


I would check the IAC motor or idle air control motor, heres a little info.about the part.Stratus Sedan, 1999-2005 Idle Air Control Motor

Print


Description & Operation

Not for Dodge Stratus Sedan
The idle air control motor (IAC) attaches to the throttle body. It is an electric stepper motor. The PCM adjusts engine idle speed through the idle air control motor to compensate for engine load, coolant temperature or barometric pressure changes. The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the air bypass passage and regulates airflow through it.
The PCM adjusts engine idle speed by moving the IAC motor pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning).

0996b43f8020234f.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig.

Not for Dodge Stratus Sedan
When engine rpm is above idle speed, the IAC is used for the following functions:


Off-idle dashpot Deceleration air flow control A/C compressor load control (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
The idle air control motor (IAC) attaches to the throttle body. It is an electric stepper motor. The PCM adjusts engine idle speed through the idle air control motor to compensate for engine load, coolant temperature or barometric pressure changes. The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the air bypass passage and regulates airflow through it.
The PCM adjusts engine idle speed by moving the IAC motor pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning).

21180_cdia_g257.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig.

When engine rpm is above idle speed, the IAC is used for the following functions:


Off-idle dashpot Deceleration air flow control A/C compressor load control (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
Target Idle
Target idle is determined by the following inputs:


Gear position ECT Sensor Battery voltage Ambient/Battery Temperature Sensor VSS TPS MAP Sensor
Target idle is determined by the following inputs:


Gear position ECT Sensor Battery voltage Ambient/Battery Temperature Sensor VSS TPS MAP Sensor


Removal & Installation

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

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.

    0996b43f80202350.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig.


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

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.

May 11, 2012 | 2000 Chrysler Cirrus

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

0996b43f802319ff-tedh1mdkpnm2cwqabpnjpaem-4-3.gif


0996b43f802319fe-tedh1mdkpnm2cwqabpnjpaem-4-2.gif


ecd523da-60e9-4928-9b74-9d90b47be2df.gif

Jul 21, 2017 | 1995 GMC Suburban

1 Answer

Will not idle when cold


The problem you describe could be result of a few different things; however, I would first check your vehicle's Idle Air Control (IAC) sensor/motor. This sensor/motor is located on your vehicles, throttle body and is easy to access. The purpose of this sensor is to control the car's idle under various operating conditions including ambient temperature. In order for it to function correctly, the internal components must be clean (meaning, little or no carbon build up) and it must be undamaged. Sometimes the IAC can be cleaned; however, if this cleaning procedure is not properly done, the IAC can become damaged. This sensor is also sometimes called the "Cold Start" sensor. A new IAC will cost $50-$100. My guess is your IAC needs to be cleaned or replaced. Good Luck!

Please remember to rate my solution. The FixYa Team!

Jan 17, 2011 | 1992 Isuzu Pickup

1 Answer

It is idleling to high


The problem you describe could be result of a few different things; however, I would first check your vehicle's Idle Air Control (IAC) sensor/motor. This sensor/motor is located on your vehicles, throttle body and is easy to access. The purpose of this sensor is to control the car's idle under various operating conditions including ambient temperature. In order for it to function correctly, the internal components must be clean (meaning, little or no carbon build up) and it must be undamaged. Sometimes the IAC can be cleaned; however, if this cleaning procedure is not properly done, the IAC can become damaged. This sensor is also sometimes called the "Cold Start" sensor. A new IAC will cost $50-$100. My guess is your IAC needs to be cleaned or replaced. Good Luck!

{{{ Please remember to rate my solution. Thaks! }}}


Jan 16, 2011 | 1998 Dodge Dakota

2 Answers

Wont start cold starts good warm


The problem you describe could be result of a few different things: 1) Check your Idle Air Control (IAC) sensor/motor. This sensor is located on your vehicles, throttle body. The purpose of this sensor is to control the car's idle under various operating conditions including ambiant temperature. In order for it to function correctly, the internal components must be clean (meaning, little or no carbon build up) and it must be undamaged. Sometimes the IAC can be cleaned; however, if this cleaning procedure is not properly done, the IAC can become damaged. This sensor is also sometimes called the "Cold Start" sensor. A new IAC will cost $50-$100. 2) Check you Coolant Temperature sensor. This senso is located on the top of your engine and is screwed into your intake manifold. When this fails your car will experience starting problems when cold outside. A new Coolant Temp sensor will cost about $100. Take a look at these two solutions first. My guess is your IAC needs to be cleaned or replaced. Good Luck!

Please remember to rate this solution. Thanks!

Jan 16, 2011 | 1997 Geo Metro

2 Answers

Mechanic changed the idle sensor. now truck will not start.whats wrong


The sensor that was changed is called the Idle Air Control (IAC) sensor. The purpose of this sensor is to control the car's idle under various operating conditions. In order for it to function correctly, the internal components must be clean (meaning, little or no carbon build up) and it must be undamaged undamaged. Are you sure he replaced this sensor? The reason I ask is that sometimes the IAC can be cleaned; however, if this cleaning procedure is not properly done, the IAC can become damaged. The IAC is located on the engine's throttle body. If your mechanic did replace this IAC, a new piece will stick out like a sore thumb. Take a look and see if he did infact replace your IAC. Either way, I would take the car back to this mechanic and make him correct the problem.

Please remember to rate my suggestion/solution. Thanks!

Jan 16, 2011 | 1998 Ford Explorer

2 Answers

Wont start in cold weather battery good anti theft not engaged


You need to replace the ign. lock cylinder and chip key, the tiny wires have broken.

Jan 09, 2011 | 1990 Cadillac SeVille

2 Answers

Won't idle in cold weather


The problem you describe could be result of a few different things: 1) Check your Idle Air Control (IAC) sensor/motor. This sensor is located on your vehicles, throttle body. The purpose of this sensor is to control the car's idle under various operating conditions including ambient temperature. In order for it to function correctly, the internal components must be clean (meaning, little or no carbon build up) and it must be undamaged. Sometimes the IAC can be cleaned; however, if this cleaning procedure is not properly done, the IAC can become damaged. This sensor is also sometimes called the "Cold Start" sensor. A new IAC will cost $50-$100. 2) Check you Coolant Temperature sensor. This sensor is located on the top of your engine and is screwed into your intake manifold. When this fails your car will experience starting problems when cold outside. A new Coolant Temp sensor will cost about $100. Take a look at these two solutions first. My guess is your IAC needs to be cleaned or replaced. Good Luck!

Please remember to rate this solution. Thanks!

Dec 26, 2010 | 1999 Lincoln Town Car

1 Answer

How do you replace the throttle position sensor


Removal & Installation
  1. Remove the idle air control (IAC) electrical connector (1) from the IAC sensor (4).
  2. Remove the manifold absolute pressure (MAP) sensor electrical connector from the MAP sensor.
  3. Remove the water pump belt cover.
  4. Remove the TP sensor retaining screws electrical connector (2) from the TP sensor (3).
  5. Remove the TP sensor electrical connector (2) from the TP sensor (3).


57f7d68.gif

Detaching electrical connectors prior to TP sensor removal



6244f87.gif

Identifying components for removal of the TP Sensor


To install:
  1. Install the new O-ring on to the TP sensor.
  2. Connect the TP Sensor electrical connector (2) to the TP sensor (3).
  3. Install the TP sensor (2) on to the throttle body (1). Tighten the TP sensor screws to 2.3 Nm (20 inch lbs.).
  4. Connect the IAC electrical connector (1) to the IAC sensor (4).
  5. Connect the MAP sensor electrical connector to the MAP sensor.
  6. Install the water pump belt and tensioner cover.
  7. Perform the TP Sensor learn procedure:
  8. Turn the ignition to the RUN/ON position.
  9. Wait 1 minute.
  10. Turn the ignition to the LOCK/OFF position.

May 12, 2010 | 2000 GMC Jimmy

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

25 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

76164 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...