Ducthess

I need to find a Auxilary port valve acuator. I can't seem to find one on the web and I was wondering if anyone new a good place to get one. Or what category they would be under in a search. Here is another question, will it hurt my car to drive it for a few days with out it? The other one is functioning properly, but the other is siezed up. All help appreciated! Thanks!

Baldy

You can try removing it and cleaning/lubing it.

Ducthess

What if that doesn't work? I can't find one any where! What purpose do they serve on the motor? The guy that is working on it said I can't drive it til its fixed because it will burn up my motor. The only thing that is wrong is the piston looking part is seized. That's all I know.

Baldy

You can drive it, you just may experience a loss of performance in the higher RPM range.



Your motor has 6 intake ports. At idle and below ~3,800 rpm, only 4 are being used. The remaining 2 open up above ~3,800 rpm. They are opened via a hollow cylinder with a hole in one end. When the cylinder rotates, the port opens. The aux port actuator is (in your car) activated by exhaust back pressure, pushes or pulls (I can't remember) its rod to rotate the cylinder. (this is why there is often concern about aux port activation when upgrading the exhaust) You can wire the ports open (disconnecting the actuator), but this generally causes idle issues, and perhaps loss of smoothness or power in low-rpm driving.



Here is a pic of an insert that supposedly improves flow in the aux ports, but it shows what the aux port and the cylinder look like:

mazdaspeed7

The actuators rarely fail, its almost always just the rotating sleeve in the block being gunked up. Pull the lower intake manifold, pull both sleeves out, it will probably take gripping them with pliers and twisting/pulling to get them out. Clean it with carb cleaner, as well as clean the runner in the block where it goes. Make sure its moving smoothly, and put the lower intake back on, being sure to align the actuator with the rod in the middle of the sleeve.

mazdaspeed7

That shows the rotating sleeves and the port actuators. That one is S5 though, which is powered by the air pump. S4 has a passage in the lower intake manifold that takes exhaust gas from the exhaust ports, and supplies it to the actuators where they bolt to the lower intake manifold.



You need to pull the lower intake off, and get the rotating sleeves out. While they are out, clean them and the runner in the block where they sit until they turn freely by hand. Then pull the actuators off the lower intake manifold, and clean out the passage that supplies the exhaust gas to the actuators. Carb cleaner will do wonders on these parts. Once everything is clean, reassemble everything. You will probably need new intake manifold gaskets, but I usually just cut my own from the gray gasket material at the auto parts store.



Ill see if I can find a better diagram tomorrow.

Coreyp024

Do you know the name of the rod that connects those sleeves? I broke the bolt the connects the one tube so I need to try and buy a new one.