[JustJeff]

Originally Posted by RETed

If you're talking about the MIDDLE fitting on the front of the throttle body...
*This is normal.*
That fitting leads to PRE throttle body, so it will never see vacuum.
It will see boost when the turbo kicks in.

You will only see vacuum if you find a fitting POST throttle body.
The fittings either above or below both go to POST throttle body.



See above - you did nothing wrong.
That middle fitting is for the emissions system which leads to the purge valve.
It looks like you have everything routed right.
Mazda designed some complicated vacuum control system to suck out vapors from the "crankcase" to be pulled from two different areas of the oil filler pipe depending if the engine was in vacuum or under load with the turbo spooling.
I think it's kinda stupid, but Mazda spent a lot of money figuring all of this out.

As for the gunk on the backside of the throttle plates...
I think yours is a Kouki 13BT?
If so, this is more so...
This is due to reversion of the intake ports.
It's exhaust gases (and other junk) being blown up from the intake ports from inside the engine and emissions.
On Kouki 13BT engines, the secondary ports open up first prior to the primary ports.
This fact allows stuff to blow back up the intact tract and tends to coat the insides of the intake manifolds and backside of the throttle plates.
Again, it's normal.


-Ted

I'll have to get more detailed info about how I have my vacuum hoses routed. Tomorrow night if I get out of work with enough time to make progress I'll go work on my car. At that time I'll get more detailed info and pics.

What I remember by memory is this:

Front 3 nipples on the UIM

1. Top = capped off and not used
2. Middle = goes to the purge control valve
3. Bottom = comes from the purge control valve

Rear 3 nipples on the UIM

1. Top = Boost gauge (right now it's connected directly to the mechanical gauge. Normally I have it routed to the electric sender for the Greddy boost gauge.
2. Middle = IIRC is the larger and goes to the OMP injectors via the splitter. One of my nipples on that splitter broke. I have it plugged and get vacuum/pressure (not sure which) from a different source on either the UIM or LIM. But only for that one OMP injector.
3. Bottom = Not sure I'd have to see it to know, it is definitely not capped.

For the OEM BOV and pressure sensor I route that from the nipple on the UIM near the BAC...with a splitter of course.

I'll get more detailed info in the next day or so.