How to Clean a Honda Idle Air Control Valve

Written by lara winston | 13/05/2017
How to Clean a Honda Idle Air Control Valve
Clean IAC valves on a regular basis. (engine image by peter Hires Images from

The idle air control (IAC) valve on a Honda operates the idle speed through the throttle body. The IAC must be kept clean; if it gets dirty, the idle speed will be greatly affected. This could damage the engine of the vehicle. Therefore, regular cleaning of the IAC is imperative.

Detach the cable that is connected to the negative battery socket. Unfasten the nut on the cable clamp. Remove the clamp from the terminal.

Lift up the bonnet and unfasten the two screws that secure the idle control valve to the throttle body. The valve and the throttle body can be found to the rear of the engine adjacent to the firewall. The screws that Honda use for the IAC valve are soft-headed, so use caution when removing them.

Take off the electrical plug connected to the IAC valve. Apply pressure to the bottom and the top of the electrical plug to detach it from the valve.

Remove the IAC valve from the throttle body, place it down on a flat surface to reveal the valve openings. There should be two openings on the backside of the valve. In one of the valves, there should be a sensing device. Check the device for dust or dirt.

Take the electronic parts cleaner and spray it all over the sensor device. If it is really dirty, take a large container and let it soak in the cleaning solution. Leave it for five minutes, letting the cleaner run through the valve openings. Spray the entire sensor, wait for the solution to become free from any dirt or dust. Let the sensing device to dry.

Place the IAC valve back into the engine, remembering how it was removed in the first instance. Turn the engine on and let it run for five minutes.

Things you need

  • Socket wrench
  • 10mm socket
  • Screwdriver
  • Electronic parts cleaner

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