View Full Version : What is the function of the TVV and how can I bypass it if need be?

11-21-2012, 05:02 AM
From my understanding it opens a valve that in turn opens the purge port on the charcoal canister based on the coolant temperature (Thermal Vacuum Valve, NOT VSV!)

If this is correct, would it be possible for me to bypass it in the event that my TVV is damaged? One of the nipples is broken off. I'm going to melt a zip tie and see if I can plastic solder it back together, but in case I can't, how can I bypass it for now?

I'm pretty sure I should be able to just run one of the lines directly to the intake mani or throttle body, right? It wouldn't run as efficiently when cold but I wouldn't run it like this for long. Which line and to where would I need to do this?

11-23-2012, 03:12 PM
Take a picture of the valve and I may have one on the 5S-FE sitting in my garage.

11-24-2012, 02:44 AM

It's the first one with the gray cap, black body and two vacuum hoses plugged into it (Well, one anyway. The other one is broken.).

If you have one, how much do you want for it?

11-24-2012, 03:53 PM
PM Sent

11-24-2012, 05:07 PM
you can bypass it. won't hurt anything but you passing smog. unless you live in sub-freezing temps, then I'd keep it

11-24-2012, 06:34 PM
My engine ran goofy at 2k rpm without it.

11-25-2012, 02:45 PM
That picture is from a 91 GT 5S-FE? If so, that TVV doesn't look like an original part. I believe the original had a light blue body. Many of these can be had at a salvage yard, can look at Camry's as well as Celica's. These TVV's typically don't fail (but they can break, as yours did).

11-29-2012, 09:03 AM
They break a lot...