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.
|Tech Article Title
|Re-greasing Hyperboost Diverter Valves
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