Join Date: Feb 2006
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Help with EBPV, disconnected
Ok, I've been having problems with my EBPV sticking. Today I figured out why. The arm for the actuator isn't connected to the butterfly valve. Following some advice I recieved from here and FTW I was going to see if I could either disconnect the actuator arm and tie the valve open or disconnect the wiring from the turbo. I removed the air box and intake hose to get a better look and found the valve disconnected from the arm completely. It looks like the arm rotated slightly and pulled away from the valve.
When the engine was cold I could easily move the valve back and forth. I wasn't sure which was open or which was closed so I tied a long wire to it so I could actuate it myself. Well, the engine started fine but after it was started the butterfly valve would not move. I turned it off before the downpipe was too hot to get near and couldn't move the valve by hand either. What the heck is going on?
The valve gets stuck at times and won't open so I get low power and high EGTs. Eventually it will open but last week I had one trip where it would not. I figure what ever is causing the valve to stick after the engine starts is probably holding the valve in what ever position it is when the engine starts. There's no actuator attached so I doubt it as anything to do with it unless its just hitting the arm and causing it to move.
Why won't the valve move after the engine starts? What is the natural state of the valve, open or closed? Will the exhaust flow cause the valve to open or close? Which way is the valve opened. With the small peg, that the arm attaches, near the turbo or away? Any help, ideas or explainations are appreciated.