I would like to replace my 5th and 6th port actuators because I think they may not be working, at least one of them, closest to the back of the car, left in the pictures, did not budge when I blew into hose that connects underneath. My repair book tells you to use a pressure gauge and low pressure co2. don't have either so i blew on it as well as the vdi actuator. the vdi actuator and auxiliary port actuator on the right did move, so i really think I should replace the one at least

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Remove the actuator then oil the upper shaft and press it in a few times see if its the actuator or, the six port valve maybe stuck

 

Take it off, spray WD40 on the "plunger" shaft. Push up and down a bunch of times until it moves freely. Spray WD40 on the lever still on the side of the engine. Turn lever up and down a bunch of time until it moves freely. Replace actuator. Should take about 10 minutes.

 

If you need to buy an actuator, I have a few laying around.