[NiGHTS]

Hiya

I took my distributor cap off just to examine it and while it was off I noticed that near the intake manifold there is the BVSV and it's supposed to have two vacuum hoses coming off it. Well, mine has one hose connected and the other hose has come off...the part which it connects to has snapped and broken off so I'm unable to re-connect the hose.

For people who have the Haynes manual, go to chapter 6-23 and look at diagram 10.1a (1979 - 1980 EGR system - I have a 5M-E). You'll see the BVSV (Black) thingy...the bottom hose is what has come off. I was just wondering, if this hose has come off will it have any major effect on the car? Like, will it prevent any system from working or wont it matter much?

While I was looking at this valve, I also noticed there is a small amount of coolant around where it connects too. So there is a tiny leak. It's not dripping out, theres just a small amount around the outside. Hmmm...

Do you guys know much about this thing?

 

[Dave A.]

Man, what an EGR system nightmare! The BVSV most likely controls the on/off switching of the EGR system, so in your case, the EGR valve(s) won't operate with that lower hose disconnected. You need to disconnect the upper hose on the BVSV and plug it to prevent a vacuum leak until you can find another BVSV.

 

[NiGHTS]

Could this be the cause of the gassy smell from the exhaust...in the other thread? hmm.

What I was thinking is, because the connecting bit which broke off is still stuck in the hose (acting like a plug) maybe I could remove that piece and super glue it back on to the BVSV...it's only plastic so it might hold.

Do you really think this one hose will prevent the entire EGR system from working?

Far out...the more deeper I go, the uglier it gets...I feel like bitch slapping the previous owners...

 

[pdupler]

Don't have the diagram in front of me, but sounds like you are describing the valve that basically disables the EGR until the engine warms up. Its the same or very similar valve in lots of different toyota models and should be easily found a replacement in local junkyards.

Phil D.

 

[Glaucus]

Nights,

Just walk into a junk yard with Supras, bring along the correct wrench, pop the hood and swipe the BVSV!

Didn't you also post about a broken hose connector from your intake manifold? Geeze, what have you been doing to that poor engine of yours?!? ;-)

- Mike

 

[MK2Racer]

What was said earlier is pretty much true. They VSV's are all similar, but Ive seen at least 4 different types of plugs on the end. Just find out which way is open by putting 12v to it, hook it up how you need and cut the old connector off and solder your current one on to it, the valve works the same, only the plug is different. This is what I did on mine, had the same valve break (or similar), the EGR vsv (82 has all kinds of EGR crap). Works fine now, not that the EGR valve itself works, but hey, it switches!

 

[NiGHTS]

Nights,

Just walk into a junk yard with Supras, bring along the correct wrench, pop the hood and swipe the BVSV!

Didn't you also post about a broken hose connector from your intake manifold? Geeze, what have you been doing to that poor engine of yours?!? ;-)

- Mike

Nearest Toyota wrecker is like 30 mins drive and last time I checked, they didn't have any MKII's.

I just bought this metal/plastic glue stuff that bonds pretty much anything together...I've glued the hose connector back on and it's in the process of drying now... I'm just trying to think how long this hose has been off...maybe a mechanic broke it off when they worked on it or maybe it's been broken off from before I got the car...

Yeah, the coolant line thingy that runs over the throttle body has a hose connector which has rusted off! That's an act of God though...it's not my fault!! lol

This last month I've just started removing items and checking/cleaning/replacing and the more I undo, the more problems I find out that haven't been fixed by previous owners...so all of a sudden I have a ton of things to fix and it's not even my fault!!...eep!!

Perhaps I should leave the bonnet shut... :wink:

 

[Dave A.]

A new BVSV from Toyota would most likely cost a huge bundle of cash. A used one is your best bet, provided that it still functions properly. If the super-duper plastic cement that you used doesn't hold, try using a dab of J B weld. That will probably hold long enough until you can find a good used BVSV. The BVSV acts as a vacuum supply switch that enables the EGR system after the engine warms up. The broken fitting shouldn't cause the engine to run rich. Vacuum leaks generally cause the engine to run slightly leaner due to the extra un-metered air entering into the picture. Have you checked the FPR yet? A few inquiring minds are anxiously awaiting your diagnosis. 8)

 

[NiGHTS]

Thanks Dave

Well, the glue stuff worked a treat! within an hour it was as hard as a rock...and now it's just like new. It was simple to fix...however, I haven't noticed any change to the engine whatsoever...wonder if that means my EGR system is buggered? I don't know...probably means that that loose hose didn't affect much...oh well...least it's fixed anyway.

I'll keep you posted on how the running rich/exhaust smell saga turns out don't worry. I'm thinking the injectors might just be really clogged up and that could be causing it...it might also explain the rough idle... :?

Anyway, thanx guys.

 

[MkIISuperSupra]

Are you sure you didn't plug the little nipple up when you glued it back together and the vacuum line is now plugged? Stick a toothpick or something into the hole and see if it goes past the glue joint. I had a heck of a time doing what you are doing and not glueing the nipple passage closed.

Leslie

 

[NiGHTS]

One step ahead of you Leslie

As I glued it on, I had a paper-clip going through the hole, into the hole it joined up to so it never got clogged...I made good sure of that. It's actually a neat little job I did there...quite proud. lol

 

[MkIISuperSupra]

Good on you. Just checking. That is exactly the way I did it. However, due to the way mine was broken, it was still a booger to get done. Replaced it shortly thereafter just because I didn't like the idea of having a "repaired" part. As I recall, that is one of the parts that Toyota sells by the gram not by function.......

Leslie

 

[NiGHTS]

Coolness.

Yeah, I tend to lean towards replacing parts rather than fixing...but only if I know fixing it wont do any good or it's beyond repair (like a mechanical failure). With this, it was only a bit of plastic which has broken off so...1. I knew straight away how to fix it and that it would be easy and 2. It would of been a waste of time and money searching around for a new BVSV when it wasn't actually broken per se.

If the valve itself was broken then yes, I would of replaced it no problem...and if I didn't have the little plastic end part which broke off then yeah, would of replaced the whole thing...thank god I had the little piece though...it was so simple to fix.

Pity it didn't get rid of the infamous exhaust smell of death...that one is for the ages...