This is related to this but I am after information about my EGR

http://www.vectra-c.com/forum/showthread.php?t=141745

1.8xe. I am cleaning stuff to eliminate possibilities before I start to buy sensors. Emission light is on.

I have taken the top half (which I am assuming is the solenoid) off - although not particularly grubby I have washed it out with carb cleaner and I have now left it full of WD40. I have read the 1.9 dti how2, but it is completely different.

How easy should it be to move the centre i.e. what looks like a piston, because I cannot move it!