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I am having surging problems in idle and at stop signs I have changed the EGR valve MAP sensor throttle body in ambient temperature control sensor new plugs spark plugs spark plug wires and coil distributor cap rotor there are no vacuum leaks surging happens at random also replaced all fuel injectors fuel lines and fuel regulator

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  • Cars & Trucks Master
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IAC sensor.

Posted on Dec 02, 2014

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2 Answers

Taurus 2002 idle


most have an idle stop screw thats adjustable with a phillips screwdrivewr or a nutdriver head..need to adjust this to between 750-800 minimum..your oil light will go out and proper rpm on the alternator will be achieved..

Jan 21, 2014 | 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

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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

I have a 1990 chevy corsica lt 6cyl 3.1 multi port fi dis ignition. the problem is it starts and idles fine, but when i push the gas it dies. before i changed some parts it wouldnt even start. ive changed...


You can manually test the egr valve by pushing up from underneath it and seeing if the spring loaded valve moves and re seats itself. If no, it's bad.

Apr 27, 2012 | Chevrolet Cars & Trucks

1 Answer

Chevy 1988 truck 5.0 My truck will start and run, but once it is warmed up and you put it in drive or reverse it dies, it will not stay running. If you put it in neutral or park it idles fine. If you put...


idl air control (IAC),may be bad,also,check the EGR valve,and all vacuum lines going and coming from the throttle body. yu can test the EGR,just try pushing the diaphram by hand from beneath. if you can move it easily its good,if its hard,or doesnt move,ot needs repaced. also a pcv valve and air filter are good ideas,considering you have replaced 80% of the emission system already.

May 01, 2010 | 1988 Chevrolet C1500

1 Answer

Code 23 engine idles but surges when in gear


Replace the Intake Air Temperature Sensor.
Depending on your size Engine (2.4L, 3.0L or 3.3L) It should be located where the Air Filter is. When you take the cover off, it wil be mounted into the cover. It has the only wires going to the cover.
This sends information to the Computer which adjust the air/fuel mixture - causing surges.
The 2nd recommednation: to remove, clean and check is the Idle Air Control (IAC) Valve and replace if necessary.

Let me know if this helped....


Apr 06, 2010 | 1999 Dodge Caravan

2 Answers

Truck has been dying surging and dying when i come to stop at li


Try shifting to nuetral at stop signs for now. Will it keep running in gear with you foot on the brake? How about with the parking brake? You may have a simple vacuum leak at the brake booster.

Mar 07, 2010 | 1992 Ford F250

3 Answers

How do I adjust the idle on a 2000 Chevy S-10 4.3 vortec? Thanks...


If the idle is too high then you either need to clean the throttle body with carb and choke cleaner or repair a vaccume leak somewhere.The throttle-body base gasket is the usual culprit.The throttle position senser should bring your idle back to normal if none of the above is the problem,if not,replace it.

Nov 25, 2009 | 2000 Chevrolet S-10

2 Answers

I have a 88 chevy pickup 1500 with a 4.3 liter engine. I have high idle problem. I would do it once in a while and quit. Now it up and wont idle down. I have new throttle position sensor, map sensor. all...


is the check engine light on ? if it idling high chances are you have a vacuum leak take a can of carb cleaner and spray the egr valve and if the engine rpm changes replace egr valve the throttle body may also be plugged pull the vacuum line off the map sensor start vehicle and see if you have vacuum if not remove throttl body and clean vacuum passage hope this helps

Oct 05, 2008 | 1999 Chevrolet K1500

1 Answer

Corvette 1990 5.7L Slow Idle Automatic


i had almost the same problem i changed my fuel pump and fuel filter and it worked u mite try that first.

Jun 25, 2008 | 1990 Chevrolet Corvette

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