Tech Article Title Author Date
Re-greasing Hyperboost Diverter Valves BLK01S4 2006
I got bored today figured its been a few years since I have serviced my Hyperboost DVs. I tested them with a Mityvac gun before servicing and they started to 'Crack' at -10 inHg. After servicing they would crack at -6 inHg.

Here goes:
Got some big pliers and cracked'em open

Here are some pics of the hard grease, it was caked in there

Here is after I hit it with some brake clean and a rag

Regreased everything and assembled