kick7ca

it shows an air bleed line for the secondaries, and my 10AE turbo doesnt' have any air bleed nipple at the LIM, just an allen key.

So please tell me if I'm correct:
I'm at work and don't have my UIM in front of me..

On firewall side of UIM the vacuum lines are:
1. LOWEST (vacuum) - operates double throttle
2. MIDDLE (no vac) - air bleed for oil injectors
3. TOP (no vac) - primary injector air bleed.
4. ???

#'s 3 and 4 have me confused. Where's the 4th go.
I don't recall seeing anything blocked off when I took it apart.

Can someone please clarify this?

Thank-you

HAILERS

I've never seen a fourth. I've always seen just a cap over that nipple. And correct me if I'm wrong, but I think the 88 models just have three nipples on the rear of the throttle body. Like you said, the only VACUUM is the lowest one for the double throttle.

alwayssideways

my 87 t2 has the 3 smaller nipples with the bigger 4th one for the brakes. as for my uim ,, i have one nipple under the where the cold start assist nipple was . and one between the oil injectors on the lim .. i was lead to believe that s4s werent suppose to have the secondary injector air bleeds .. but im probobly wrong

kick7ca

this is similair to mine.
My car is exibiting the symptoms of a vac leak, I refered to FSM which shows a secondary air bleed line and thought that must be my leak as I don't recall hooking it up. But alas, no line exists and I'm back where I started wondering why it started once and never yet again.

HAILERS

I have two working turbo cars and a spare turboii intake manifold. All have four nipples on the rear, one above the other. The top one is capped off on each intake manifold. There is another nipple but its for the brake booster and is NOT one of the four that are arranged one above the other.

Any of the top three can be used for the primary air bleeds although one of those is larger and is meant for the oil injectors. There is no secondary air bleed on a series four turbo engine/manifold.

kick7ca

HAILERS you da man.
Thanks for checking if that's what you did.
I'm itching to get home and check my intake for an uncapped nipple, if I find one, I've found my problem.

RETed

Air bleed for secondaries are only for Kouki (turbo only?).
None of the Zenki (turbo only?) have it.

The bottom small fitting in the rear goes to the thermo wax on the throttle body.


-Ted

kick7ca

I removed my TB, I have only 3 nipples on firewall side of TB; double trottle control, oil injectors and primary air bleed.

Where else is a vacuum leak likely to be???

NZConvertible

The S4 FSM vac diagram incorrectly shows an air bleed line for the secondary injectors, which I've always thought was really strange since it wasn't introduced until the S5.

If you look really closely at the online version of that diagram you can see the nipple for the double throttle vac line under the other lines on the back of the UIM. In the Haynes manual there's a reference letter on that nipple that shows how it's connected to the TB.

So you should have three nipples on the back of the UIM. The bigger one in the middle is for the oil nozzle air bleeds, the top one is for the primary injector air bleeds and the bottom one (the only one that sees vacuum) is for the double throttle system.

HAILERS

You, of course are a gentleman and a scholar.

Attached are two jpg of a Mazda RX-7 TurboII intake manifold. Notice the FOUR nipples that you inquired about. In the first picture I left the cap on the top nipple. In the second I removed the cap AND the hose from the nipple that goes to the checkvalve.

Now, it's widely known that there is a *Knockoff* of the Mazda throttle body. It's made in Togoland and is sold on the blackmarket and or E-Bay (same thing, E-Bay and Blackmarket). The *Knockoff* throttle body is known to fail and cause vacuum leaks. The *Knockoff* can be identified by having only Three nipples on the back of the throttle body. Have fun. I am.

kick7ca

C'mon! Mine only has three nipples on the back! Your telling me my throttle body isn't a Mazda part? It just seems unlikely considering I know the full history of my 10AE. How can I be sure?

While I had my car apart I put a paper gasket between the sub-zero component and the LIM, I'm wondering if this could be a likely cause of my vac leak?

HAILERS

1. The *Knockoff* was meant to be humor.

2. The Sub Zero.....the paper gasket should have worked. I just unbolted mine and chunked it and put a flat piece of metal over the hole with epoxy on the mating surface. On one car I removed it and put a quarter with epoxy on it over the hole. Ain't been stolen yet. Does not leak.

3. Spraying starter fluid overe the possible sites of a vacuum leak works wonders (engine idling).

4. If the acv is installed .....there is a small possibility that the anti afterburn valve part of the acv is leaking air into the intake manifold. Spray starter fluid into the airpumps intake hose and if the idle moves either up or down, then that part of the acv is leaking. The anti afterburn holes on the mating surface of the acv can be plugged with RTV for the cost of pennies.

5. Again, the *KNOCKOFF* from Togoland was humor.

kick7ca

[QUOTE=HAILERS]1. The *Knockoff* was meant to be humor.

QUOTE]

lol
I thought you might me messing with me, but I wasn't sure, so I googled frick'n Togoland cause I thought you made it up, but it exists.

psha!

I dont' trust anything with more than 2 nipples anyway.

HAILERS

My last post on this thread: In your first post you had everything right. The fourth nipple, on top, should be capped off. Happy motoring!

cbrock

iTrader: (1)

hailers,

Is that the primary injector air bleed inbetween the oil injectors (now plugs ) on the housing? Take this line to the top nipple on the firewall side of the UIM?

What does the fitting at a 45* on the LIM go to? This is a S4 turbo with everything removed.

BTW, what happens if the injector air bleed system isn't hooked up right? Because it wasn't happy trying to idle a month ago when I last fired it up. The air bleeds were for sure hooked up wrong..perhaps to a vac (I sent it to that 45* nipple mentioned above). Could also be my ancient gas or just the fact that since everything is removed I needed to adjust my idle screw on the TB.

HAILERS

No, that is a FUEL INJECTOR AIR BLEED b/t the two outboard oil injectors. It feeds the primary fuel injectors.

The nipple that sticks out at an angle is the vacuum supply for the fpr solenoid.

HAILERS

Attached is a jpg of how/where the middle nipple goes.

RETed

If the (primary) air bleed vacuum is not hooked up right, idle quality is degraded.
I did this by accident by using too much silicone RTV which effectively plugs up the small holes for the primary air bleed vacuum and my idle SUX.


-Ted

NZConvertible

Hailers, I'm assuming those pics are of a S5 UIM? S4's don't have a secondary injector air bleed as you said, so would only have three nipples (oil nozzle air bleed, primary injector air bleed and double throttle system). Or am I missing something?

HAILERS

That is a genuine series four upper manifold off a TurboII. It's just like the one on the three series four TurboII cars sitting out in front of the house (one belongs to the fellow who hasn't paid me for his rebuild, YET).

They all have the four nipples one above the other and each had/has a cap on the uppermost nipple. I've no idea why they have four and other people just have three nipples altogether.

The fourth nipple and discussion is really just RX-7 trivia. It's not important Important things are things like the Twin Turbo Zet electronic turbo charger.
Increases engine acceleration power up to 30 per cent
Fuel savings up to 30 per cent
Reduces exhaust emissions up to 30 per cent on gasoline engines depending on its condition
Reduces engine noise and vibrations
2 year limited warranty against defects
Value-priced compared to mechanical turbocharger
Maintenance-free
(humor)

kick7ca

Again with the humor....

cbrock

iTrader: (1)

well the crappy idle is probably explained because I hooked the FPR solinoid (45*) to the primary injector air bleed. I think what confused me is that I thought S4's had secondary air bleeds and no primary. Again, this is why I should finish projects quickly and stay focused.

I've got it now.
Cap the 45*
Top vac port to injector air bleed near housing between oil injectors.

BTW, what is the best diameter vac line to use for best fit.

HAILERS

The angled near the oil injector area should go to the fpr solenoid or straight to the fpr itself if you desire. The fpr solenoid is the one with the orange plug on it.

cbrock

iTrader: (1)

All that's gone. I'm running an aeromotive parallel fuel system.

NZConvertible

You should still use that angled nipple on the LIM, as this was specifically put there for the FPR.