JCs84

See Pics below.... Probably a simple question for you vets, but I can't find this part in my books and I think it is bad. It connects on the line feeding my bi-metal choke assembly. I can't blow through it either direction. Can it (the little green thing that looks like a filter) be taken out of the line and the lie run direct?

Also I need a new Bi-metal Choke Assembly for my 84 with 12a. Previous owner has bent/sprung it. Anyone have one that works?

Scott1982

That green assembly is a restrictor if I remember correctly - would cause you much stress to blow through !

Scott

JCs84

So why the hell is it on there?

blackdeath647

iTrader: (2)

to restrict haha, oh man, but seriously, if you don't have to go through emissions, take off all that damn rats nest , less vacuum hoses to have to worry about.

JCs84

I'm considering it if I can't find someone to sell me a vacuum advance solenoid!! Got one?

This is not removed with standard rats nest, it goes to the choke opening vacuum diaphragm from the passenger side of the carb.

The off-vehicle adjustments call for a vacuum applied to check clearance, so why would this line have a restrictor?

DivinDriver

iTrader: (15)

It's a vacuum delay valve, I think. Pretty sure it's purpose is to introduce a calibrated time delay between vacuum developing at the source, and arriving at the diaphragm.

Using a vacuum pump, it should slow the response of the vacuum signal.

blackdeath647

iTrader: (2)

i don't know much about it, i know i removed mine, all them little things were removed within a week that i got it lol, i think i may that one laying around somewhere, if i find it, i'll let you know man

j9fd3s

iTrader: (3)

yep! they do go bad, theres some bulletin for a rough idle with the choke on, and you replace that valve.

part number is/was 8671-23-980

JCs84

Thanks. I will try the part number as mine has to be bad. I dont see a method for testing it, but unless delay means never, this has to be bad.

I still need a vacuum advance solinoid off a rats nest and the electric/spring choke if anyone has them.

ray green

iTrader: (14)

I thought that was a check valve, only allows flow one way. If you find a source (Mazda dealer?) please let us know, I'd like to change mine out too.

Thanks
Ray

JCs84

Hey Ray, if yours allows vacuum one-way it is doing more than mine.

FBsliderseven

iTrader: (2)

take the rats nest out!!!

ray green

iTrader: (14)

One in ten of mine does, the rest are either very restricted or completely restricted.

I'm sure having functioning units whatever they do (there are actually several of these green things on the stock set up) will help the rat's nest do it's excellent job of smoothing throttle response, decreasing emissions and increasing performance and gas mileage. So I'd like to replace mine with new units if I could find the part.

Anybody know where to get them? I asked once at the Mazda dealer but the guy said they weren't available anymore. Was he right?

JCs84

Ray,

I know from my surfing that you are a huge supporter of the stock set-up, and I have seen pictures of you engine bay that should be framed...awesome!

I have searched the part number given above and can not find anything yet. What I would like to know is what it actually does. Limiting? One-way? Delay? Restrictor??? If I knew what its function was I might be able to find a part available that will do the same thing.

Let me know if you find out anything.

j9fd3s

iTrader: (3)

its a delay valve, if you suck on one end, it should hold vacuum for 5ish seconds, and then release.

i wanna say theres another number for it, but i dont remember what its from (fd? gsl-se? 626?) i looked into this in like 96-97, the part was available, but it was in the $40 range then, so it would be like $60 now (dollars taken a huge crap)

ray green

iTrader: (14)

Thanks JCs84, the White One is good to me so I try to be good to her (she gave me a real nice 300 mile business trip today, 152,000 and going strong).

j9fd3s, that would explain why green check valves weren't working, they aren't check valves. Thanks! I'll have to test them again, maybe they're fine.

(A friend of mine replaced his with one way check valves, might explain why he's still got idle problems).

Still, it would be nice to have a replacement available if needed. Even if they still work, the plastic gets brittle and the nipples break off - be careful taking them out! Ask me how I know.

JCs84

Ray,

I can't find this part anywhere. I have purchased a couple from other members who have swapped carbs to replace mine and have an extra.

ray green

iTrader: (14)

Thanks JC, so yeah, it looks like new ones of these don't exist. I have a bunch of them but have no good way to test them so who knows if these 20+ year old plastic parts are still good?

When I get a chance I will try DivinDivers "delay valve" idea, but I'm still not sure what a proper test would be. Apply vacuum for 5-10 seconds? Anybody know?

And if they are all bad I'll be looking for some more!

j9fd3s

iTrader: (3)

two things.

1. just suck on one end, if the valve is good, it'll open up in a few seconds (i think its like 5-10?)

2. this valve ONLY affects the idle with the choke on. once the choke is off its not doing anything

ray green

iTrader: (14)

OK, I went out and tested the damn things with the vacuum gauge.



All the green ones were the same, partial restriction in both directions, but no timed delay. They pull around three inches of mercury with the arrow and 8 inches against it. So it looks like they delay flow in one direction but not in the other.

There are two of the green units in the stock 84 GSL, both on the driver's side of the carb, located close together:



Not sure what they do, but looks like they'ar doing it for me.

There's another one of these gizmos on the passenger side, similar but with a black barrel (also see the first photo):



The black one pulls equally hard in both directions, around 22 inches of Hg (I checked two of them).

Again, not sure what the black ones are doing, but it looks to me like these 24 year old plastic Mazda OEM parts are holding up pretty well. You gotta love the 12A.

You guys who lost the rat's nest (along with the gas mileage and throttle response) hold on to those green things and black things, OK?

JCs84

RAY!!! You are a man after my own heart! No preservatives, no hangover! See the attached Pic. I was once told that Coors Light and sex in a boat were the same.....FUCXXNG close to water!!! Well, I like sex in a boat!



Your tests are similar to what I have seen as well. Relative to the black barrel solenoid, I can hardly get flow to go either way. This is one of two lines that go the the vacuum diaphragm which pulls the choke off. I'm thinking it is not very important and am going with what I have.

ray green

iTrader: (14)

Yep that's how my black ones are working too, very little flow either way, that's why I was able to pump the vacuum gauge up to 22 inches (in both directions; these valves don't have an arrow). My guess is that the black one is designed to bleed air at a slow rate.

And the green ones must do something similar, but a little faster and delaying flow in only one direction, against the arrow (at 8 inches Hg) and not with the arrow (only a weak 3 inches resistance).

I suppose all this is in the FSM someplace. I'm still curious about what they do but not curious enough to go slogging through that thing.

And yeah that Coors Light is very sexy beer.

PS I have lost of spare carb parts, should have what you need. Could you pm a picture so I can be sure to get the right thing?

JCs84

I went ahead and bought the whole carb with all attachements from jaidedeye for $40, and someone else is sending me a couple of solenoids and another black barrel vacuum delay/restrictor to have on-hand. I appreciate the offer though. Later

Rob

ray green

iTrader: (14)

There you go. You can't have too many spare parts! Let us know if you need something else.

DivinDriver

iTrader: (15)

I nabbed a green-end one in the "oh, and these misc parts" handful on the last junk-yard trip; my model uses mainly the larger blue/black ones. If anyone needs a green one, let me know.