Aaron Powell

I broke the plastic cap I the piece that screws in to the intake manifold under the carb spacer. It had a spring and steel plunger in it, seems like it's a pcv valve to me but I can't seem to find it. Any ideas as to what I can do with it, or what I can put back in its place? I have a pcv valve on it currently that I installed with the rats nest delete.

Jeff20B

iTrader: (13)

It is what the book calls an altitude compensator but I've used it as a PCV valve in the past. Works fine.

By the way, that position works perfectly as a vacuum and boost signal source for a BOV and a boost gauge.

mazdaverx713b

iTrader: (91)

Who hasn't broken one of those or had an SA with one that was broken, lol.

Jeff20B

iTrader: (13)

I have several that are broken. Good thing they are easy to repair. Just break off the rest of the plastic and remove the guts. Get a short length of coolant hose on the steel nipple. Shove a PCV valve inside it and ziptie or hose clamp it on. Hook the other end of the PCV valve to your carb if retaining the altitude compensator, or hook it to your oil filler "neck" and put a small breather on the other nipple on the intermediate plate. This is a very effective PCV setup for your 12A.

Jeff20B

iTrader: (13)

The PCV valve to look for is the Fram FV333 or FV266

mazdaverx713b

iTrader: (91)

That's an excellent idea Jeff! Never thought of doing that as a repair!

j9fd3s

iTrader: (3)

+1 Mazda still has these 8761-13-770. you won't find it anywhere else

Aaron Powell

Thank you guys for all your help. With the information you all provided for me, I was able to purchase a new one from mazdaswag. I'm going to install it some time. Just need to get the hose that broke with the old unit haha.

Aaron Powell

Yeah buddy

Holdfast

Can I just block this off? Will it affect the way it runs? Still want to be able to pass smog in California. Not worrying about the visual smog test. Smog tech won't know it's missing. But will notice a rigged up pcv valve.

7aull

iTrader: (2)

Balise Mazda and mazda swag both say NLA

Stu A
80GS
AZ

Holdfast

This was a pretty old Post from 2017. Could of been available then. Doubt it now. Just want to know if the altitude compensate thing will affect smog results or the way it drives if I plug it up.

Benjamin4456

It should be fine to block off. The FB did away with that style of altitude compensator anyway. At the end of the day it's just another controlled vacuum leak on the intake manifold.