I decided to take apart my EGR from my parts car to check it out and see how it works.
It's the Canadian version with the coolant lines and vent tube.
It's all rusted to hell and full of carbon deposits.
The parts car was burning a butt load of oil and the previous owner had "Check The Oil" written on his gas cap.
The screws we're nasty and I didn't spray them thinking it wouldn't really help at this point and everything would get all slippery and hard to hold.
The screwdriver didn't work out and the heads we're damaged from being removed previously.
The ViseGrips got them out. lol
I had to use the chisel to separate it.
Lots of crud in there too but the plunger moved freely and smoothly with no binding or sticking.
I got this screw out.
But the end cap wouldn't come off so drilled a hole in it and tried to pry it off.
Didn't work so I decided to leave it.
It looks like this pin needs to come out to disassemble it any further and I didn't want to bother.
Then I decided to play with the step motor.
I couldn't get the motor to go.
I thought it was a four-position motor and it didn't seem to work.
The pushrod is on a worm gear and I figured out that the four outside wires each turn the motor about 3 and if you touch the right wire, it turns about 6. The middle two wires are positive.
If you touch each wire around in a circle it slowly moves the pushrod out.
If you go around in a circle the other direction, it pulls the pushrod in.
So, as it turns out, I used to have a fully functional EGR until I butchered it. lol
Then a friend came by for snacks.