Idle Air Control Motor IAC Replacement

Step by step guide on how to replace an idle air control motor valve. This article pertains to most vehicles equipped with a non electric throttle bore, appearance will vary but the procedure is similar.

Difficulty Scale: 3 of 10 Tools and Supplies Needed

  • Socket Set
  • Wrench Set
  • Screwdriver set
  • Shop Towels
  • Protective gloves and eyewear
  • Replacement Idle Valve
  • Carburetor Cleaner
Begin with the vehicle on level ground engine off (cold) with the emergency brake set.

Step 1 - Locate and remove the air intake bore which is attached to the throttle bore and is usually done be loosening the mounting clamp. (Note: some idle air control motors can be replaced without removing the throttle bore.)

Remove Air Intake Boot

Step 2 - Once the air intake has been removed proceed in removing all vacuum lines from the throttle bore. TIP: Snap a quick pic from your phone to avoid confusion in reassembly.

Removing Vacuum Lines

Step 3 - After vacuum lines have been removed, locate and disconnect the sensor and idle air control electrical connectors. Be gentle with these connectors because they can be brittle due to under hood conditions.

Removing Electrical Connectors

Step 4 - Next, slowly remove the radiator cap to relieve system pressure, then locate and remove all coolant hoses connected to the throttle body.

Removing Coolant Hoses

Step 5 - Then, remove both the throttle and cruise control cables from the throttle body.

Remove Throttle Cable



Written by
Co-Founder and CEO of
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


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Article first published (Updated 2014-06-27)