I've been told by my Indy that my solenoid is sticking. Has anybody used air tool oil to lube the system. I've read an Audi Forum that this has worked on their valve blocks and should be done for maintence. 10 drops of oil on the air inlet filter or in the inlet house will do the trick.

Has anybody done this to unstick or maintence their valve block?

 

I just rebuilt mine saves headache in the future and although it is tedious it isn't very difficult. It's pretty cheap as well, think I paid $26 for the O'ring kit off ebay. EAS Valve Block Rebuild Guide « PaulP38A.com