How do you replace the idle air control valve on a 1999 Infiniti QX4?

Answer 1

It is impossible to remove the valve without taking off the intake manifold that it is bolted to.

Remove all of the various hoses and electrical wires that are connected to the intake manifold.

Remove the accelerator and cruise control cables from the throttle body.

Remove the distributor cap and allow yourself access to the throttle body and detach that.

Next, take the two spark plug wires closest to the firewall off of those spark plugs but leave all wires connected to the distributor cap.

Unbolt the manifold with a star bolt (don't remember the size).

Turn the manifold upside down and you'll see the valve bolted onto the underside slightly obscured by a few pipes which are easy to disassemble.

While everything is off, clean the throttle body and the air intake manifold with carburetor cleaner.

Put new valve on and put everything back in reverse order. Remember to put a new manifold gasket and I don't remember the torque values for the manifold bolts.

Take your time, it's really not too bad.