vsv question

Bru · 04-11-2010, 02:24 AM

Thanks for the homepage link.

After reading the article (and not being sleepy) The main purpose of the EGR VSV is to keep the EGR valve closed until the engine has warmed up by blocking the vacuum. Even a defective VSV has some functionality. The default (unenergized) state of a VSV is to allow vacuum to pass through. The result would be a little more nitrous oxide pollution until the engine has warmed up. JDM Supras don't have a EGR system at all. A defective Fuel pressure up VSV would allow vacuum to the regulator at start up and as usual.
Driveability would not be greatly impacted by a malfunction of either VSV provided the hoses are connected.

04-11-2010, 02:24 AM	#8
Bru Bone Stock w Upgrades ;-) Join Date: Apr 2010 Location: Tampa Bay Posts: 210	Supra VSV Thanks for the homepage link. After reading the article (and not being sleepy) The main purpose of the EGR VSV is to keep the EGR valve closed until the engine has warmed up by blocking the vacuum. Even a defective VSV has some functionality. The default (unenergized) state of a VSV is to allow vacuum to pass through. The result would be a little more nitrous oxide pollution until the engine has warmed up. JDM Supras don't have a EGR system at all. A defective Fuel pressure up VSV would allow vacuum to the regulator at start up and as usual. Driveability would not be greatly impacted by a malfunction of either VSV provided the hoses are connected. Last edited by Bru; 02-09-2011 at 07:45 PM.