Question about 1998 Oldsmobile Achieva

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Stoopid car wont idle

I cant get my car to idle. I have been told it is either the idle sensor or the idle air control (iac), where are these and how hard is it to replace them?

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  • Daniel Thrash
    Daniel Thrash May 11, 2010

    well you should pull the codes off it first cuz if it's either of those you'll get a code

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In a sense both of these parts are on in the same. This has been a very common problem with GM vehicles. The part that you need is called an Idle Air Control Motor, or IAC for short. This is an easy repair and will only take about 20 min. The IAC is located on the throttle body. and is a round cylintrical motor that is about 3-4 inches long, and has a 2 wire harness coming off of it. You should be able to pick one up at a local part house for about 50-70 dollars., here is a picture of what the valve looks like, and the Car Quest part # is 76033
stoopid car wont idle - 86420703

Posted on Aug 19, 2008

  • Jonathan Dawson Aug 19, 2008


    sorry the picture did not take the first time

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What is an IAC Valve


Google is your friend in such questions.

  • Idle air control actuator - Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Idle_air_control_actuator An idle air control actuator or idle air control valve (IAC actuator/valve) ... Idle air control actuator; MAP sensor; Mass flow sensor; Oxygen sensor; Starter motor;
  • how to tell if your iac valve is going bad - YouTube www.youtube.com/watch?v=oNO8GCN8jQA
    • BY TIMMY102345
    • 6 MIN
    • 939K VIEWS
    2009-09-07 · Video embedded · how to tell if your iac valve is going bad timmy102345. ... #372 Better repair method Toyota Camry Idle Air Control Valve - ...
  • 4 Ways to Check an Idle Air Control Valve - wikiHow www.wikihow.com/Check-an-Idle-Air-Control-Valve
    • 525K VIEWS
    2015-12-11 · How to Check an Idle Air Control Valve. ... Again, an idle air control valve can have an issue or fault without triggering a check engine light. 2.


  • There are also videos in this link. How to check and fix.

  • What is an IAC Valve Bing video

    May 12, 2016 | 1992 Toyota Paseo

    1 Answer

    84 mustang 5.0 auto-Idle problems. runs Ok when cold , runs rough and stalls when warm. 1st year throttle body injection. was told the IAC valve needs cleaned. can`t find on car


    the iac sensor is along the side of throttle body , did you give the throttle plate area a good cleaning out this is where the air path is for the IAC sensor , a lot of idle problems have been fixed with a can of throttle body cleaner and few good squirts of the stuff down the hole

    Sep 10, 2015 | Cars & Trucks

    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

    1 Answer

    1999 gmc 5.7 wont go to slow idle when warm how to fix


    could be idle controll sensor or iac idle air controll valve also that may have a pcsensor or pedal controll sensor

    Mar 02, 2012 | Cars & Trucks

    1 Answer

    03 Chev express 2500 wont stay running at an Idle, code reader says IAC valve but this engine dosnt have the IAC valve on it any Ideas


    Hi there,

    Your engine does indeed have an Idle Air Control (IAC) Valve.

    It is a sensor bolted to your throttle body - look for an electrical connector.

    A malfunctioning IAC can cause improper idle of your engine.

    Nov 08, 2011 | Cars & Trucks

    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

    1 Answer

    Wont idle down


    your IAC idle air control sensor is probably gunked up and if it is so is your throttle body...also check all vacuum line for integrity..i found a bad hose going to my MAP sensor..both of this caused problems.
    Clean the IAC with throttle body cleaner not carb cleaner, and dont clean the map sensor its contolled by air vacuum, just replace the hose if found cracked, if its bad you have to replace it it cant be adjusted.

    May 09, 2010 | Nissan NX Cars & Trucks

    1 Answer

    Does a 2001 have a iat sensor?


    Idle Air Control (IAC) Motor OPERATION The IAC motor is mounted to the throttle body and is operated by the engine controller. The throttle body has an air control passage that provides air for the engine at idle (when the throttle plate is closed). The IAC motor pintle protrudes into the air control passage and regulates air flow through it. Based on various sensor inputs, the engine controller adjusts engine idle speed by moving the IAC motor pintle in and out of the air control passage. The IAC motor is positioned when the ignition key is turned to the ON position.

    80ae138.gif
    OPERATION Found on V6, V8 and V10 engines, the intake manifold air temperature sensor is a variable, thermister type which reacts to temperature changes. In cold air, its resistance is high. As temperatures increase, its resistance decreases.





    a1fee25.jpg
    Fig. 2: Location of the intake manifold air temperature sensor — V8 engines

    c3ae7d3.gif
    The sensor element itself extends into the intake manifold air stream to provide input voltage to the engine controller. This signal is used along with signals from other sensors by the engine controller to determine the fuel injector pulse width.

    Aug 25, 2009 | 2001 Dodge Ram 2500 Truck

    2 Answers

    Replacing Idle Control Valve on 97 Pathfinder, need help!


    it's on the throttle body. Here's a Quest with same 3.0L engine. These often need cleaning with carb or throttle body cleaner

    Idle Air Control (IAC) Valve When the engine (6007) is running but not at idle, the throttle valve controls the amount of air admitted into the engine. The powertrain control module (PCM) (12A650) increases the fuel injection output in proportion to the increased airflow to achieve the appropriate air/fuel ratio. During idle, the throttle valve is almost fully closed. It is therefore necessary for the idle air control system to supply air for combustion during idle. The idle air control (IAC) valve allows a metered amount of air to enter the intake manifold (9424). The camshaft position (CMP) sensor detects engine speed and sends a signal to the PCM. The PCM sends a duty cycle (On/Off) signal to the IAC valve which allows additional air to enter the intake manifold. Air is added by the IAC valve to maintain the set lowest idle speed at which the engine can operate. The idle speed adjusting screw allows adjustment of the airflow into the intake manifold.

    0cb8ac7.gif
    Fast Idle Control (FIC) Solenoid The fast idle control (FIC) solenoid helps maintain a constant idle speed while the air conditioning is operating. When the air conditioning is turned on, the front climate control panel sends out two signals. One signal is sent to the powertrain control module (PCM) (12A650) to engage the A/C compressor (19703). The second signal is a ground signal sent to the FIC solenoid relay, to engage the FIC solenoid. The FIC solenoid supplies additional air to adjust the increased engine load.

    May 27, 2009 | 1997 Nissan Pathfinder

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