help diagnose vsv damage?

peterhodges · 11-03-2009, 01:59 PM

it's a 1990 4x4 3vze

there are three of these behind the fuse box on the passenger side. they got sprayed with acid and now i think they have or will quit working. i think they are vsv's, but does anyone know for sure what these are or do? in the mean time i will keep going through the manual to see if i can find them. thanks

RedRunnertc · 11-03-2009, 05:36 PM

Um, how exactly does something in your engine bay get sprayed with acid?

Can't say that I have seen those in my truck ...

peterhodges · 11-03-2009, 05:50 PM

the battery slid onto the powersteering pully, misting the engine compartment with a fine essence of eloctrolyte.

a parts counter helped me out... they are officialy 'valve assemblies, vacuum switching'. he couldn't tell me what they do, however. if they are EGR components then i can live without idle control and exhaust recirculating.

my main problem is i suspect one of them actuates the 4wd, although looking at the FSM i don't see any electronics or vacuum attached to the transfer case except for one 'transfer indicator switch'.

RedRunnertc · 11-03-2009, 05:57 PM

Ohhhh - gotcha

The ADD works off a vacuum solenoid. There is a prox switch on the shifter, that when engaged sends "signal" to the solenoid to switch, which engages the vacuum to move the ADD yoke, which is then picked up by another prox switch to light the 4WD light.

Or you can switch to manual hubs and lock the ADD yoke in the "engaged" position.

peterhodges · 11-03-2009, 07:43 PM

aha!

since i have manual hubs i guess there is no vacuum switch for the 4x.

the vsv switches in question must just be various emissions type junk.

thanks

hunter4runner · 11-03-2009, 07:47 PM

the lines for those run in and out of the plenum and to a vacuum canister in the wheel well, I think they're emissions junk, if you figure out how to kill them without messing up your idle/engine control let us know.

peterhodges · 11-05-2009, 06:22 PM

well my idle is definitely messed up. before i thought maybe it was the coolant temperature sensor but it looks like the coroded vsv's are probably the culprit. hopefully it at least keeps running until i can track some of these down at a parts yard, they are awfully expensive new!

just passed 300k and now it's just one thing after another!

hunter4runner · 11-05-2009, 11:35 PM

where are you located, theres a ton of them in Georgia do you need me to pull some and ship them to you ?

BeerHat · 11-06-2009, 08:59 AM

Those look like your A/C and fuel pressure regulator vsv's. The green one is for your a/c which increases your idle due to the increase load of the a/c compressor. The black one connects to your fuel pressure regulator then to the t-coupler on the plenum.

hunter4runner · 11-06-2009, 08:16 PM

check the classified section there is 4runner being parted out you could grab them from there

11-03-2009, 01:59 PM	#1
peterhodges Member Join Date: Jun 2007 Posts: 40	help diagnose vsv damage? it's a 1990 4x4 3vze there are three of these behind the fuse box on the passenger side. they got sprayed with acid and now i think they have or will quit working. i think they are vsv's, but does anyone know for sure what these are or do? in the mean time i will keep going through the manual to see if i can find them. thanks Attached Thumbnails

11-03-2009, 05:36 PM	#2
RedRunnertc CO Chapter Prez Join Date: Dec 2005 Location: Boulder/Longmont, CO Posts: 13,571	Um, how exactly does something in your engine bay get sprayed with acid? Can't say that I have seen those in my truck ... __________________ President - CO Chapter Founding President - OH Chapter '93 4Runner lockers, armor, tcases, & stuff '96 Impala SS - my own personal cop car Check out pix at www.4wheelingoh.shutterfly.com/action

11-03-2009, 05:57 PM	#4
RedRunnertc CO Chapter Prez Join Date: Dec 2005 Location: Boulder/Longmont, CO Posts: 13,571	Ohhhh - gotcha The ADD works off a vacuum solenoid. There is a prox switch on the shifter, that when engaged sends "signal" to the solenoid to switch, which engages the vacuum to move the ADD yoke, which is then picked up by another prox switch to light the 4WD light. Or you can switch to manual hubs and lock the ADD yoke in the "engaged" position. __________________ President - CO Chapter Founding President - OH Chapter '93 4Runner lockers, armor, tcases, & stuff '96 Impala SS - my own personal cop car Check out pix at www.4wheelingoh.shutterfly.com/action

11-03-2009, 07:47 PM	#6
hunter4runner Veteran Member Join Date: Aug 2007 Location: Loganville, Georgia Posts: 635	the lines for those run in and out of the plenum and to a vacuum canister in the wheel well, I think they're emissions junk, if you figure out how to kill them without messing up your idle/engine control let us know. __________________ The above written is not intended to insult your mechanical ability, it is simply a suggestion or option.

11-05-2009, 11:35 PM	#8
hunter4runner Veteran Member Join Date: Aug 2007 Location: Loganville, Georgia Posts: 635	where are you located, theres a ton of them in Georgia do you need me to pull some and ship them to you ? __________________ The above written is not intended to insult your mechanical ability, it is simply a suggestion or option.

11-03-2009, 05:50 PM	#3
peterhodges Member Join Date: Jun 2007 Posts: 40	the battery slid onto the powersteering pully, misting the engine compartment with a fine essence of eloctrolyte. a parts counter helped me out... they are officialy 'valve assemblies, vacuum switching'. he couldn't tell me what they do, however. if they are EGR components then i can live without idle control and exhaust recirculating. my main problem is i suspect one of them actuates the 4wd, although looking at the FSM i don't see any electronics or vacuum attached to the transfer case except for one 'transfer indicator switch'.

11-03-2009, 07:43 PM	#5
peterhodges Member Join Date: Jun 2007 Posts: 40	aha! since i have manual hubs i guess there is no vacuum switch for the 4x. the vsv switches in question must just be various emissions type junk. thanks

11-05-2009, 06:22 PM	#7
peterhodges Member Join Date: Jun 2007 Posts: 40	well my idle is definitely messed up. before i thought maybe it was the coolant temperature sensor but it looks like the coroded vsv's are probably the culprit. hopefully it at least keeps running until i can track some of these down at a parts yard, they are awfully expensive new! just passed 300k and now it's just one thing after another!

11-06-2009, 08:59 AM	#9
BeerHat Member Join Date: Jun 2007 Posts: 36	Those look like your A/C and fuel pressure regulator vsv's. The green one is for your a/c which increases your idle due to the increase load of the a/c compressor. The black one connects to your fuel pressure regulator then to the t-coupler on the plenum. __________________ 2007 Voodoo Blue FJC Proud Member of Toyota Trail Riders Natural selection is good for the herd as a whole because the general speed and health of the whole group keeps improving by the regular killing of the weakest members. Excessive intake of alcohol, as we know, kills brain cells. But naturally, it attacks the slowest and weakest brain cells first making the Brain a faster and more efficient machine. That's why you always feel smarter after a few beers.

11-06-2009, 08:16 PM	#10
hunter4runner Veteran Member Join Date: Aug 2007 Location: Loganville, Georgia Posts: 635	check the classified section there is 4runner being parted out you could grab them from there __________________ The above written is not intended to insult your mechanical ability, it is simply a suggestion or option.

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