what problems could be causing no egr in my fc s5 ?? mileage? rough?....

 

Absolutely nothing. S5s never had EGR valves.

 

My car have no ACV , this works with vaccuum? actuators and VDI ? how many VDI are?

Cause I take out the vaccuum hoses and nothing changes...

Sorry if im making dumb questions...

 

S5 NAs use air pump pressure to activate the aux. port actuators (2) and the VDI (1). A nipple that is normally on the ACV directs air pressure to a pair of solenoids (6PI & VDI) that activate at 3800 RPM and 5200 RPM respectively. When activated, air is pumped to the actuators & VDI, which allows them to move into the 'open' position. They only see positive pressure; never vacuum. Also, you can't test the system by free-reving in your driveway, since the ECU also requires a load on the engine before the solenoids are activated.

If you don't have an ACV, these two systems are likely not working. And if you don't have an air pump they are definitely not working. Make getting them functional a priority, since you are down a lot on power without them.

 

OH ok i will, but what coould be causing that the vacuum is not working at all, I put out a line of vacuum and i dont see changes..

thanx

 

Well it depends which line you pulled. Your car will always have vacuum when running, its just the nature of an engine. Furthermore, you could be pulling a vacuum line that connects to the ACV, and from your previous posts about those, you said you don't have an ACV. So of course, no vacuum. Or maybe its not connected to the ACV and the hose you pulled off was actually disconnected on the other side?

You probably pulled the vacuum lines off the solenoid rack, which connects to the missing acv. But regardless, your engine will always make vacuum.

 

the hose I disconnect was same side of acv near to o2 sensor (or that area)

So, first thing to do is put the ACV then I will see really which vacuum is not working, if is the case.... right??

and another question, what is between intanke uppear and down this, in the little hold it forms, like near to VDI?

 

s4 ACV its the same I use for s5 ? if is different, a pic will help plz..

 

There are a lot of hoses in that area, hard to tell without a picture which one specifically.

Not necesarrily, you can follow the lines you pulled and look where they lead you to. But I am really positive the one you pulled if on the ACV side, just ends up going to the solenoid rack, so you really have nothing connected.

I made a mistake on my previous post as to saying you will see vacuum on the lines going to the ACV. I believe some of the lines going to the ACV might have air PUSHED through them due to the airpump and ACV, so no vacuum, but you should feel air getting pushed. One of those two....

Not sure again without a picture, could be the AWS valve, which has the one big hose coming off in the middle of the intake manifold.

 

This diagram should help. The ACV has 3 lines running to it: a light blue one, a pink one and a yellow one. One of these will be the pressure source for the 6PI and VDI systems (pink one?), and the other two will be for the switching and relief valves. These two will have vacuum on them some of the time, depending on if the switching and relief solenoids are energized. The FSM specifies when this happens.

 

Something important I forgot to mention, I have no cats and I got headers, soo I Think ACV wont work, or am I wrong?? I think some of this lines goes to the cats, explain me this plz...
If thats the case I will just wired the ports i guess... If it dont i will keep trying to get ACV back...

What part of valve, etc... control the vacuum, cause I tried with many pulled vacuum hoses and nothing changes....

I dont have ACV installed now I must say....

 

Only the split air pipe goes to the cat, but you can leave it off if you don't have one. The ACV's other functions will work just fine. The main thing you need is the air pressure nipple that feeds the 6PI and VDI systems. The other stuff is secondary.

As I said before, the ECU triggers the relief and switching solenoids, which will allow vacuum on 2 of the 3 lines going to the ACV. Stop worrying about vacuum, those two parts of the ACV don't even matter. The only thing that matters is the pressure source for the aux. ports and VDI.

 

Have you got the ACV like I recommended on your other post? There is not much you can do right now, what is it exactly that you are trying to diagnose?

 

Oh ok, since Im going to the mechanic tomorrow I will put back the ACV (I have conic filter, not oem )I dont know if something connects to thhis..... It will be helpfull if you tell me the connections that I have to do once I got the ACV back. Maybe I pic will help.

 

It seems my mechanic has the ACV but Im not sure if its right, Ithink this should be, am I right?

http://cgi.ebay.com/ebaymotors/Mazda...Q5fAccessories

My car its not running good, and bad mileage ....I think this should be for no ACV, and any vacuum works also, I feel my car powerless and I know could be better... cause sometime I felt it better than now.

 

Yeah thats the S5 ACV, thats the one you need. I don't think the S4 one will work (86-88).

 

Ok i will do this first tomorrow and then I will see how is the thing about vacuum.... i will be telling you how it goes, thanx

 

which connections needs to be made once I put back the acv?

 

Well, I have to say it, I found that my car is such a mess, no air pump, no acv....

I think I just gonna take off the actuators...what do you think?

 

Just replace the air pump and ACV.

 

I'll suggest what rotaryrocket88 suggested. But if you do decide to go the removing actuators and removing the 5/6th port sleeves and wiring VDI open I would suggest you remove the rats nest and cap off all unused vacuum ports. You will only need to route vacuum lines for the fuel pressure regulator, and then route fresh air, not vacuum via one of the nipples on the upper intake for the fuel injector and oil injector air bleeds. Maybe your cruise control too, but it cleans everything up alot and you will simplify things....