AUGieDogie

iTrader: (4)

OK so what does it do.

My understanding is that it puts air from the smog pump into the exhaust stream to help with emmisions. Is this right?

HAILERS

It adds Additional air from the airpump to the exaust port INSIDE the exhaust ports. That's where most of the air from the airpump goes anyway...........to the EXHAUST PORT sleeves. Inside the engine. At least at idle it does.

The Split Air Solneoid opens only in fifth gear and adds additional air to the catalytic converter thu the split air pipe.

Split Air Pipe sees a lot of air when you first start driving down the road, because the passage to the exaust ports gets shut off so it can't send air to the exhaust port and it can only go to the split air pipe.

But as you drive down the road at a steady pace the switching solenoid gets energized and sends air to the split air pipe. But after 120 seconds give or take, the Relief valve opens (relief solenoid gets deenergized) and in my opinion should send most all of the airpump air overboard into the right front fenders silencer. So I guess residual airpump air still makes it's way into the split air pipe (Switching solenoid stays energized). Something like that

Applying throttle and then letting go will make the Port Air Solenoid open/shut i.e. letting more air to the exhaust ports and cutting the air off to the exhaust ports. If the Switchig solenod is energized which also results in the MAIN passage to the exhaust ports to close, then if the Port Air Solenod goes open, that is the only passage of air to the exhaust ports at that time.. Something like that.

Anyway, if your going to have emissions tested, make sure the air isn't being dumped out into the right front fender when the car is at idle. Then remove the BLUE connector off the Relief solenoid and once that is done a lot of air should come out that large port on the side of the ACV leading to the right front fender. All old ACV leak some air out that large hose on the side of the acv. But when the blue connector is removed a LOT of air should be dumped out that large hose on the side of the acv.

AUGieDogie

iTrader: (4)

Great info as always hailers. I AM having emmisions failure only at idle and i figured that was what was doing it.

Now that my car is cool again im going to pull it and test the damn thing with my My-t-vac. see if it opening or not. The spare i have here on my desk doesn't seem to want to move with vac applied. Its the diafram on the bottom right? You can see the spring through the silencer dump port.

Now back to the manual....................

RotaMan99

HAILERS, on the LIM, there are 2 vacuum nipples, which one goes to the relief valve and which one goes to the port air. Mazda vacuum route diagrams suck for this, they don't even show where the vacuum line goes for the primary air bleeds. I know where that goes though.

I havn't delt with emmisions in years so I forget.

AUGieDogie

iTrader: (4)

Ok so I did some testing on the damn thing. I applied vacuume to the little acctuators and such and I got the same rusults on both. (not that I can use either of these anyway, broken bolt holes) The main acctuator on the bottom will hold vac. but the rod doesn't move in either of them. Now that actuator seems to have a small hole in the end of it so that some air can get out to the silencer. It looks like it should be pulled down with vaccume so that more air can get down to, whereever. But it seems to be failing. If the one from my car is the same then I guess im gust testing the damn thing wrong.

HAILERS

The Turbo ACV is different than the non turbo.

It uses vacuum AND air pressure to operate that ACV.

Airpump air pressure comes out the middle small nipple.....goes to the relief solneoid on the other side of the engine.......returns as pressure to the small nipple on the bottom of the ACV and that pressure operates the relief solenoid. So blow into the bottom nipple n the ACV, and you'll see the piston go up inside the acv.

I get myself confused b/t the non turbo and turbo acv. If memory serves, if the engine is fully warmed up, and you remove the VACUUM hose from the top of the turbo acv (nipple that sticks straight up is for the Switching solenoids vacuum), that act will make air come out the bottom large hose. In a couple of hrs I'm going to try that out on my turbo car to verify that. Anyway that top small nipple should be able to hold a vaccum. Suck on it with a piece of spare vacuum hose to verify it will hold vacuum.

On a NON TURBO ENGINE.......there are two small nipples above the ACV. The REAR one is for the Relief solenoid. With a fully hot engine, if you pull that hose off, a lot of air will come out the bottom large hose. Put it back on and the air coming out the bottom large hose will abate.

OR with a hot engine, pull the rear small vacuum hose off. Feel for vacuum on it, At the same time reach over and pull the blue plug off the Relief solenoid. The vacuum will go away on that small rear hose that you just pulled off.

HAILERS

I checked the turbo. If you put a piece of vacuum hose on the bottom nipple and blow, large amounts of air should come out the bottom large hose. Engine running and fully warmed up.

RotaMan99

thanks hailers.