Plain Jane OEM nothing to see here rebuild

[JustJeff]

Originally Posted by RETed

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 do have Kouki 13BT. But just to be clear Zenki is 86-88, Kouki is 89-91?

[RETed]

Originally Posted by JustJeff

I do have Kouki 13BT. But just to be clear Zenki is 86-88, Kouki is 89-91?

Yes, sorry I tend to use the Japan nomenclature more consistently.

"Zenki" = "before" = S4
"Kouki" = "after" = S5



-Ted