?

 

Get a copy of the shop manual for your car at one of the links in the FAQ at the top of this section. Read and learn.

 

5th & 6th port actuators.

 

the one on the left does not move at all like the right one

 

Theyre your 5/6th port actuators. Under a certain RPM, your engine runs on 4 ports, but once you reach a certain RPM(cant remeber what)and the vaccum gets high enough, it acts on those diaphrams and opens the 5 and 6th ports allowing more air/fuel in. Think an archaic VTEC for your intake tract. lots of people elliminate them. Mazda says you lose low end power and economy without them. . I dont know.

 

so its not a big deal if they dont work

 

If they don't, you lose low end power. Bad for gas mileage and starting acceleration.

 

so is there any way to tell if they dont work

 

If they don't open at all, then you lose high-end power.

You can smear a glob of grease on the base of the 2 shafts on top of the actuators, go for a drive (be sure to get over 4k rpm), and then look to see of the grease got smeared. Someone else has also suggested to clip paperclips at the base of the shafts, drive, then see if the clips are higher on the shafts.

If you want to know exactly when they open up, you'd have to do something more complex, like rig up an electrical connector that makes contact with the actuators, um, actuate, and somehow connect that to a light in your dash. There was a write-up somewhere, I can't remember what website.