Well I got the new valve yesterday and installed it today. I removed the ALDA which required the removal of the CC actuator and washer fluid tank for wrench clearance. I don't think the clearance is a problem on the 603 as the extra cylinder pushes those devices back a little bit, and the ALDA is relatively clear. And Sixto, I got the bayonet lock off of the control rod sensor plug fairly easily. It just clicked CCW a little bit, and the plug popped right out with a little wiggling. The ALDA took quite a bit of force to break free, but once it came loose it was easy to take out. After taking out the 10mm screws, the oily valve popped right out. I made sure to get the stop lever connected to the valve when I installed the new one, and had a block of wood ready in front of the turbo inlet just in case while starting. I had my brother start the car and it stayed right at idle. Then we shut off the key and it shut down immediately.
I love it when fixes are cheap! Many thanks to all who gave advice!
