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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3 Answers

What Is A IAC Sensor?


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.

Apr 19, 2017 | Cars & Trucks

1 Answer

Why does my 2004 buick rendezvous idle at 3000 rpm and put in gear it drops to 1500 rpm and shifts hard while driving due to high engine speed?


Stuck throttle plate . gummed up with varnish or a problem with IAC valve . IAC - idle air control valve ! Videos on youtube , how they work how to clean . Idle Air Control Valve Could have unmetered air entering the engine pass the MAF sensor , a bad MAP sensor ! I would check the throttle plate first , if dirty clean it . Then check IAC valve if not the throttle plate . GM Idle Air Control IAC Function Diagnostics and Repair

Dec 14, 2016 | Buick Cars & Trucks

2 Answers

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
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    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
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    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

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    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

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    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

    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

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