Bills86e

1994 4runner SR5 3.0L 3vze
My Vacuum Switching Valve is open at start up and the vacuum is opening the EGR valve, irradic Idle results. It runs crappy and a foul smell too.
How does this valve close, it will click and shut if I put 12v to it? Is it supposed to get electrified at start-up? New one does same thing.
I first thru parts because I was not enlightened:
EGR valve & pipes
cap
wires
rotor
modulator
R&C'nd TB & intake
C'nd DP
Fuel filter
Air filter
Vmaf
AC & heat work very good
All running lights work

The three VSV valves, Blue is next to firewall, Brown center haslines to egr & mod, green front.
Any one have a pic of the correct routeing?

PlainJaneYota

It sounds like the vacuum modulator is broken, check the OEM dealer site for the diagram and the part ---> https://parts.olathetoyota.com/index.html

Bills86e

Wife has mechanic change valve cover gaskets, he re-plugged the vac lines on wrong tubes. Who would've Thunk? 3VZE now runs perfect. No more foul smell or
erradic Idle. ALL is well! Yes, Modulator & hashpot filters needed cleaning too. TB & IAC was filthy inside.

Punchy

The Blue VSV is to the PAIR, The Red (brown) is to the Fuel pressure up and the Green is to EGR.

Bills86e

My red/brown was connected to egr. green was to fuel regulator, hencethe foul smell, vac to egr at idle.

Bills86e

thread closed