Tools You'll Likely Need:
* Socket set: Various sizes, including possibly a deep socket for reaching the IAC motor.
* Wrench set: May be needed for some fasteners.
* Screwdrivers: Phillips and possibly flathead.
* New IAC motor: Ensure you get the correct part number for your specific vehicle.
* Shop rags or paper towels: To keep things clean.
* Possibly a breaker bar: If bolts are stubborn.
* Torque wrench: Essential for tightening bolts to the correct specification.
* Cleaning solvent (optional): For cleaning the throttle body.
Procedure (General Steps):
1. Disconnect the Battery: This is crucial to prevent electrical shorts and damage to the car's computer system. Disconnect the negative (-) terminal first.
2. Locate the IAC Motor: It's typically located on the throttle body, a large metal housing attached to the intake manifold. The IAC motor is usually a small cylindrical component with an electrical connector. Refer to your repair manual for the precise location.
3. Disconnect the Electrical Connector: Carefully unplug the electrical connector from the IAC motor.
4. Remove the IAC Motor: This varies depending on the year and model. It might be held in place by screws or a retaining clip. Use the appropriate tools to carefully remove the motor. Some IAC motors are screwed directly onto the throttle body, while others might have a retaining clip or even be held in place with a small bracket.
5. Clean the Throttle Body (Highly Recommended): While you have access, carefully clean the throttle body using a throttle body cleaner and a clean rag or shop towels. Be gentle to avoid damaging any sensitive components. Make sure to avoid spraying cleaner directly into the intake manifold.
6. Install the New IAC Motor: Carefully install the new IAC motor in the same position as the old one. Make sure it's seated correctly.
7. Reconnect the Electrical Connector: Carefully plug the connector back onto the new IAC motor.
8. Reconnect the Battery: Reconnect the battery's negative (-) terminal.
9. Start the Engine: The engine might idle roughly initially, but the computer should adjust to the new IAC motor after a few minutes of running. If the idle remains rough or erratic after a short drive, there may be another issue to troubleshoot.
Important Considerations:
* Consult a Repair Manual: This procedure is a general guideline. A repair manual specific to your Chrysler 300M's year and engine is essential for detailed instructions, torque specifications, and diagrams.
* Safety First: Always disconnect the battery before working on any electrical components.
* Cleanliness: Keep everything clean to prevent dirt from entering the engine.
* Torque Specifications: Use a torque wrench to tighten bolts to the manufacturer's recommended specifications to avoid damage.
If you are not comfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. Improperly installing the IAC motor could lead to poor engine performance or even damage.
