what are these for what do they do
07-28-06, 06:02 AM
#5
Royale with cheese
Join Date: Jan 2004
Location: Las Vegas, by way of Poulsbo, WA
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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.
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07-28-06, 09:45 AM
#9
meh
Join Date: Sep 2002
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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.
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.