If your Mitsubishi Galant is idling erratically, the Idle Control Motor (ICM) might be the culprit. Dealer repairs can be costly, often around $600. This guide provides a DIY approach to replacing the ICM on your Obd2 Mitsubishi Galant, saving you significant money. This repair involves removing the throttle body (TB), so prepare for a moderately challenging task.
Gathering Parts and Tools
Before starting, acquire the following: a new ICM (around $200 from the dealer – ensure it includes the rubber gasket for the ICM and the metal gasket for the TB), a new can of PB Blaster penetrating oil, brake cleaner, a large container for waste, a set of pliers lock wrenches (including a long nose), and optionally, a 25-watt soldering iron. Don’t forget those all-important screws securing the ICM to the TB – there are 4 or 5 of them.
Removing the Throttle Body and ICM
With the necessary tools and parts assembled, you’ll need to safely secure the throttle body upside down. A makeshift stand using 2x4s and some old rags for protection works well. Once secured, liberally apply PB Blaster to each screw securing the ICM to the TB. Patience is key here, as these screws are often rusted.
Using the pliers lock wrenches, carefully loosen each screw one at a time, allowing the PB Blaster to work its magic on the remaining screws. A long nose wrench may be needed for hard-to-reach screws. Avoid using screwdrivers, as they can easily strip the screw heads. A soldering iron can be used to heat stubborn screws before applying force with the wrench.
Cleaning and Installing the New ICM
After removing all the screws, carefully detach the old ICM. Before installing the new one, thoroughly clean the throttle body with brake cleaner. One or two cans may be necessary to remove all oil and debris. A brass or nylon brush can help clean the butterfly valve. Check the butterfly valve for excessive play – some minor air leak is acceptable but significant play might require further attention.
Once clean, install the new ICM with its new gasket, ensuring all screws are tightened securely. Reinstall the throttle body using the new metal gasket.
Final Thoughts
Replacing the ICM on an OBD2 Mitsubishi Galant can be a challenging but rewarding DIY project. Remember to work patiently and methodically, using the right tools and techniques. By following this guide, you can save hundreds of dollars compared to dealer repair costs. This process, coupled with using an OBD2 scanner to diagnose the initial problem, empowers you to take control of your vehicle maintenance. Remember, disconnecting the battery before working on any electrical components is always a good safety practice.
