VSV, vacuum switching valve.
Plenty of discussion on this board - try here for instance:
http://www.toyota-supra.info/forums/...r-answers.html
By the way , site owner, the search functionality is really annoying. Like you can't search for "VSV", because it's too short.
"The following words are either very common, too long, or too short and were not included in your search :
vsv"
Really annoying.
Good site though
