Question about 1999 Dodge Stratus

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A.I.S. (automatic idle speed) motor

Where do you find this on the engine?

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Its on the throttle body

Posted on Oct 27, 2008

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96 dodge diesel was idLing at 1000 rpms set idle at 780 now engine won't start unless you step on fuel slightly


Automatic transmissions need to have a higher idle speed on the motor because of the load put on them by the transmission. You may have set it too low. 780 might be the idle speed with the transmission in D and the brake set.

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Chrysler 300 cuts off while idling with the AC on. It was doing it maybe once or twice a month. Lately it's been more ofton. I had a tune up and fuel filter changed in April 2014. What could be the...


replace IAC/AIS motor on throttlebody. IAC= Idle air control
AIS= Automatic Idle Speed. Same thing just 2 different names. Steps up engine RPM automatically when any load on engine such as AC, Turning, heater etc turned on.

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1998 Durango will not idle


Check A.I.S./I.A.C. motor on throttle body. Known by both names, Automatic idle speed motor (AIS) Idle Air control (IAC) . Usually mounted on side of throttle body, with 2 or 3 torx screws and it's job is to adjust idle at all times as necessary, such as when AC on, turning, etc when extra load on engine, it will increase idle as needed to overcome the load and maintain proper idle speed. You can often remove the motor and clean pintle (pointed end that goes inside throttle body) with throttle body spray cleaner as well as spray inside the port (hole) that it comes out of. Sometimes this will cure the problem for quite a while, but if only for a short time, and it happens again, replace it.

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This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If the above cleaning doesn't cure your issues you need to have the computer controlled automatic idle speed control system diagnosed and repaired by a dealer or electronic engine control repair shop.

Nov 07, 2012 | Cars & Trucks

1 Answer

High --1600 rpm ?? rpm idle


The normal idle speed is below 1,000 rpm...between 800 to 900 rpm. I suspect that the idle-air control motor has seized and can no longer automatically adjust the engine's idle speed. This part is also responsible for slightly increasing idle speed when the airconditioning is switched on to compensate for the added engine load. Some cars even have a "step-up" solenoid to increase idle.

When replacing the idle-air control motor, remember to clean the port that IAC motor goes into; there will be some carbon build-up that may prevent the part's cone-shaped valve from seating properly. A can of intake valve spray helped along with some Q-tips works well.



Hope this helped.

Have a great day !!!

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Idle at 250 rpm


Idle Speed Control (ISC) Motor OPERATION Eagle Throttle Body Fuel Injection (TBI) System NOTE: The Eagle TBI system is used only on 2.5L Premier engines. The Idle Speed Control (ISC) motor is mounted to the throttle body and controlled by the PCM. The throttle lever rests against the initial adjustment screw of the actuator (plunger). The idle speed is not adjustable. The initial adjustment screw is only used to establish the initial positioning of the actuator when the ISC motor has been replaced. The actuator extends or retracts to control engine idle speed and to set throttle stop angle during deceleration. Based on inputs from the various engine control system sensors and switches to the PCM supplies current to the ISC motor to adjust the actuator position for the particular operating conditions.
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Aug 05, 2010 | 1995 Dodge Spirit

2 Answers

Cooling problems


It sounds like everything is working properly. The temperature will go up when idling. The wter isn't being pumped through the system as fast. When idling, the engine runs at around 750 rpm's. When driving, even at low speeds, the engine speed is at least double that. Make sure your antifreeze is set for at least 20° below zero.

Aug 28, 2009 | 2002 Mitsubishi Lancer

1 Answer

Automatic vehicle stalls at low rpm


This is proplem with the IAC valve , try clean the valve and if that doesnt work replace it.

An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body

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Jul 09, 2009 | 2002 Land Rover Freelander

1 Answer

98 galant 2.4 engine speed uncontrollable after 1600 rpm


check automatic idle speed motor if equipped.

Jul 07, 2009 | 1998 Mitsubishi Galant

1 Answer

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sounds like the automatic idle speed motor is malfunctioning and probably needs replaced

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