hey guys. heres a pic of a broken tube and nipple for a part i dont know the name of connected to my BPV. does anyone know what the plastic cylindricle object is so i can replace it. i dunno if i wud be spiking or not with this disconnected like this. the plastic nipple broke inside the tube when i was inspecting it the day i recieved the car. sorry for the big pic havin probs resizing. thanks
thats hose just recirculates the air from the By pass valve back to the intake...any hose/tube thats fits will work. get an OEM or just get an aftermarket blow off valve to replace it...
That is NOT the recirculating hose for t he by-pass air and any old piece of whatever will not do.
The piece that is broken in that photo is the VTV and it is crucial to the proper functioning of the OEM BPV. I would not trust trying to fix that piece, just get a new one from Toyota.
Also, the orientation of the piece is critical. Make sure you install the new one in the same direction as the old one.
oh, I thought he was talking about the bigger hose wuth the clamps on it. . but yea, you're right. when i bought my 91, it was broken the same way and the unit had to be replaced. If I remember right, that little critter was like $45.00...my bad
it's just as Doc J said-VTV for By pass valve... when I first got the car, there were alot of little things broken/diconnected/leaking, etc. the car ran OK, but alot of hesitation, noises, unstable boost, etc. I put the car in the shop and they changed/repaired a bunch of stuff. i can't really pin point any thing to that particular part from my own experience...
That piece is crucial to the OEM valve working properly.
It IS what is responsible for the OEM valve responding so quickly and to such subtle changes in boost.
Quote:
Originally posted by billwot
Here is an old writeup I used to post. Reference to "check valve" measn the VTV (It isn't a true check valve).
"The large round area at the top is a diaphragm. The area on the top of the diaphragm is larger than the area under the diaphragm. Now note there is hose directly from the manifold to the top (large area) of the diaphragm, and another hose tee's off that goes through a check valve to the underside (small area) of the diaphragm. When there is pressure (boost) in the manifold, there is equal pressure on both sides of the diaphragm, but since force=pressureXarea, the greater force on the top holds the valve closed. In fact, the higher the boost, the more tightly the valve is held closed.
Now as soon as you lift, and pressure starts to drop in the manifold, air immediately escapes from the top of the diaphragm, but the check valve restricts it from escaping on the bottom, and the pressure on the bottom quickly exceeds the pressure on the top, and the valve snaps open. If you reverse or eliminate the check valve (VTV) then you can't trap pressure under the diaphragm, and the valve cannot respond as quickly.
Conversely, the check valve insures that when there is a vacuum condition, more vacuum will be applied to the top of the diaphragm, and it will open and be in bypass mode.
The diaphragm section of the valve is connected to a spool in the main section of the valve. That spool opens and closes the connection between the crossover pipe and the intake air pipe. When the diaphragm is pushed (or pulled) to the top, the valve is open, and when it is pushed to the bottom, it is held closed.
There is just a light spring on the spool in the main body. Its only function is to return the valve to its normally closed condition when the engine is not running."
had a look at jeff's site. thats how a site shud be. informative in many aspects. good job guy. read about the VTV on there too. atleast i'm a lil more knowledgeable now. sucks about all those accidents.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
ToyotaNation.com is an independent Toyota/Lexus enthusiast website. ToyotaNation.com is not sponsored by or in any way affiliated with Toyota Motor Sales, USA, Inc. The Toyota, Lexus and Scion names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.
Forum for every generation Toyota MR2. Including the AW11 and SW20.
Linear Mode
