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How to Remove an IACV on a 240SX

An idle air control valve (IACV) on a Nissan 240SX allows air to bypass the throttle body in its fuel-injected engine to regulate idle speed. The engines computer controls the valve electronically using inputs from various other sensors in the system. Because of its position, the valve is susceptible to carbon buildup that needs periodic cleaning. To clean the carbon off the valve, it is necessary to remove the IAVC from the 240SX.

Instructions

1

Unplug the four connections from the idle air control assembly by squeezing the connector locks and separating the male and female ends of the plugs. Remove the hose between the idle air control assembly and the intake assembly by unclamping the hose ends and pulling them free.

2

Slip a 10 mm socket onto a 3-inch, 3/8-inch drive extension and attach the extension to a 3/8-inch drive ratchet wrench.

3

Loosen the bolt attaching the bracket with the gray connector to the idle air control assembly with the ratchet wrench set up by turning it counterclockwise until it is free and removing it to move the bracket out of the way of one of the idle air control valve bolts.

4

Remove the 10 mm socket and install a 12 mm socket onto the extension. Remove the top two bolts attaching the IACV to the idle air control assembly by turning them counterclockwise with the ratchet wrench set up until they are free.

5

Remove the 12 mm socket, install a 3/8-inch drive universal joint on the extension and slide the 12 mm socket onto the universal joint. The universal joint is necessary for removal of the lower bolt.

6

Place the 12 mm socket on the lower bolt. Remove the bolt by turning it counterclockwise until it is free.

7

Grasp the IACV by hand and pull it out, completing the removal of the IACV from the 240SX.