Idle air valve

[Scott R]

Guys, I am still having an idle drop off issue/shudder, even after checking for leaks and what not.

This all started after I had the intake off to replace the seals, and to bypass the old cyclic valve.

My question now is can you install the idle air valve backwards? I remember seeing an "arrow" on one side of the housing. Should the arrow be visible on the front, or facing the engine block? I can't in my mind figure out how this would matter, but maybe it does.

Also with the cyclic valve bypassed, did I mess something else up? I just ran the bypass, I did not unplug the electrical connection.

[robm-951]

Also with the cyclic valve bypassed, did I mess something else up? I just ran the bypass, I did not unplug the electrical connection.

When you bypassed the cycling valve, did you plug the open ports or disconnect the line that goes to the j-boot? if not, that is where your air leak is.

The cycling valve is essentially a 3 way valve. One of the ports is a vent to relieve pressure from the wastegate diaphragm by relieving the pressure (metered air) back into the j-boot. Also, since the j-boot pressure is always at or less than atmospheric pressure, any negativity helps keep the wastegate closed.

Rob

[Scott R]

I cut the line going from the J-boot to the hard fitting, then plugged it with a bolt and and a hose clamp.