Hi

I have an 1987 rx7 turbo and my engine is running to rich (to much fuel and not enough air) i think it might have to do with my air control valve. Dose anyone know how to test it or replace it? Or dose anyone have a replacement air control valve for for sale. thanks

 

I would be looking at lots of other things before the ACV. For one thing, the only time the ACV injects air into the intake should be on decel, via the anti-afterburn valve. The rest of the time the ACV is injecting air into the exhaust for emissions purposes...

Done a tune-up lately?

 

Yeah I have a 87TII I just failed emissions, with 2 new cats and all smog equipment, the exhaust stinks pretty bad,my test results show the O2 is way to low I called Mazda Trix and they said the ACV is most likely bad, then based on all that, the exhaust isn't getting dilluted, Well I would like to know how to test it as well, what do you got to take off to test it? Anyone ?

 

Search under ACV and Hailers and you'll find a test procedure as well as lots of other info.

 

Is the intake air filter clean?

You could block off the ACV and pipe the air pump output directly to the cat.
It's crude but effective.

 

Like the man said, the ACV only puts air in the intake during deceleration. It's mostly a emissions device that injects air into the exaust ports and at times the split air pipe.

Their diaphrams seem to cook on a TurboII after a number of years.

You can see if the diaphrams are good by using a piece of spare vacuum hose. Put the hose on the very bottom nipple and blow. Under pressure the lower diaphram should move inside the acv. You can see it thru the large outlet hose fitting on the ACV.

The ACV has one nipple that sticks straight up. That's for the switching diaphram. You should be able to suck on that nipple and it should hold a vacuum. If it does not it's no good.

There are methods of checking out the operation of the ACV in the free online fsm for turbo cars. It's in the Fuel Section along with diagrams of how the thing works.