88turborx7

iTrader: (1)

I've done some searches and didn't come up with anything to help me. I have a Haynes manual and a FSM also but neither helped me.

I am rebuilding my engine, I am putting a 91 into my 88 anniversary. I am using all 91 parts except for the engine harness/vacuum piping and oil inlet pipe. The 91 solenoids on the vacuum piping were all busted which is why I am using the 88, but they are very different. The soleniods on the 88 are different from the 91. The oil inlet pipe is different as well.

I have removed and blocked off:

ACV
air pump and split air pipe
OMP
TB mod

Problem is I didn't remove the engines myself and the throttle body was already removed from the engines by someone else, so I don't know where any of these vacuum lines go, which ones I can cap off? I've been studying the diagrams with little luck.

On the 88 vauum piping, the first solenoid is green (twin scroll turbocharger). The 91 does not have this. The next is gray for the switching solenoid valve, then orange for the pressure regulator control and finally blue for the relief solenoid valve. My book says there is a yellow one for the EGR but I don't see it anywhere.

I just need to know what I don't need and can block off. I followed all the lines from begining to end and know which ends up where, I just don't know what they are supposed to connect to at the end . Thanks for any help.

NZConvertible

You have no AVC or air pump, so you obviously aren't concerned about emssions. You don't need to install any of the solenoids. Two (gray and blue) are for the ACV and the third (orange) is for the Hot Start Assist System, which doesn't affect the engine's running but can be plumbed in with vac hose if you wish.

Plumb it up like this:



It says S4 but the S5 is basically the same. Omit the oil nozzle vac lines since you have no OMP and ignore the twin-scroll actuator.

Wankels-Revenge

Hey NZConvertible..where's that picture from?

NZConvertible

I made it. I edited the vacuum routing diagram from the 88 FSM (page (4B-5) using MS Paint.

Wankels-Revenge

Wow....ok im impressed now

taco-salad

I had trouble finding the secondary injector air bleed on my manifold, where exactly is that nipple in corrolation to the sub zero start unit on the manifold? I have a s4, and I think I heard that they only put the secondary injector air bleed on the s5 cars, so then would it be ok to cap off the top vac line on my throttle body?

HAILERS

taco-salad
........cause it ain't there on a series four.

HAILERS

Secondary air bleeds exist for a series four. See here: http://www.mazdatrix.com/c-6.htm

Without tearing my intake apart, I *remember* a nipple, a single nipple, in between the oil injectors on the intake manifold. It feeds the secondary injectors thru a passage in the intake manifold. Like I said, I *remember*.......

EDIT: If you had a 87fsm, look at page 1-71 and you can see the hose coming off the nipple b/t the oil injectors on the intake manifold. It leads to a passage to the secondaries and the primay air bleeds.

taco-salad

let me just check if I'm following you.

I have a vacuum hose connected in that location you were talking about from the second vacuuum nipple on the throttle body, and that hose is for both air bleeds primary and secondary, and if that is true, what is the top vacuum nipple on the back of the throttle body used for.

taco-salad

bump back to the front

88turborx7

iTrader: (1)

That's a great pic..thanks. One more question, which oil inlet pipe should I use? The 88 or the 91? They are different, the 91 has more hard lines (which I don't know where they go yet either).

HAILERS

Series four, 87model, has four nipples one above the other. The top one is capped off. The very bottom one is the only one that carries a vacuum and it goes to its left where the cold start sys for the secondary throttle plates are.

88turborx7

iTrader: (1)

OK, I've capped off everything now, I guess the purge control valve is of no more use....what exactly does it do?

NZConvertible

Fuel vapours generated in the fuel tank while the engine isn't running are stored in the charcoal canister. When the engine is restarted, the purge valve controls the rate at which these fuel vapours are sucked into the manifold to be burnt.Ê

If you remove the purge valve, remove the charcoal canister too and disconnect the line charcoal canister's line at the fuel tank.

silverrotor

iTrader: (1)

Just to add, It's best to plug the metal hard line when you disconnect the Charcoal Canister (CC). Eitherwise, you'll be venting fuel fumes In the Engine Bay. The 3-way valve (found outside the Fuel Tank) will allow venting to take place there. 1 of the 3 valves at this valve was put In place there In an event that you have had a clogged valve to begin with (one leading to the CC).

NZConvertible

Avoiding fumes in the engine bay was why I said to disconnect it at the tank, but I guess plugging it and letting the check-and-cut valve do its thing would have the same effect.

silverrotor

iTrader: (1)

I knew you now that Jason...I'm just adding my twisted version.

88turborx7

iTrader: (1)

OK, I got a good deal of work done on the engine today, but now I have some more Q's...please be patient

1) On the intake manifold (S5) there is a vacuum line that runs between the 2 secondary fuel injectors and then comes out the back side(engine back). What does this connect to because on mine it is already capped off?

2) Since I removed the purge valve do I cap that big nipple on the intermediate housing right by the oil filler?

3) On the oil inlet pipe there is a hard line that I assume connected to the charcoal cannister....just cap that off as well?

4) On the rear housing just under the fuel pressure regulator there is a big nipple...what is this and what connects to it?

5) Now the throttlebody...on the right side where according to the diagram above the primary and secondary imjector air bleeds connect and the oil injector air bleed. There are 2 small nipples and one big one. Which is which? Remember I removed the oil injectors.

6) On the back of the throttlebody there is another nipple that I don't know goes where.

7) Where is the EGR valve on the S5? I found it on the S4 intake manifold.

That's about it...for now I am getting tired of saying nipple. Thanks for any help, I need it.

1SxyRXy

restricter pill?? i just switched out my stock boost sense line with silicone. should i try and find this pill?

NZConvertible

Photo?
No, the sump must remain open vented. To avoid oil fumes in the engine bay, run a hose from the nipple under the car and cable tie it to something. If you feel like spending money you can run it to a catch can.
Exactly the same as above.
Coolant to the thermowax on the TB.
Big is for the oil injector air bleeds, small is for the fuel injector air bleeds.
Photo?
No EGR valve on S5's.

NZConvertible

Turns out silverrotor and I were wrong. The C&C valve won't relieve pressure if you cap the charcoal cannister line, because that's the line the excess pressure normally escapes through. You'd definitely need to disconnect this line at the C&C valve to avoid fumes in the engine bay.

88turborx7

iTrader: (1)

Is it easy to access the c&c valve? I can see where it is in my FSM on page 4b-3. I'm beginning to think I should just leave the charcoal cannister in place. I will try to get a friend with a digital camera to take some pics of the parts that I was trying to describe.

88turborx7

iTrader: (1)

Here are the pics I said I would get:

88turborx7

iTrader: (1)

Here are the pics I said I would get:

88turborx7

iTrader: (1)

Here is a pic of the hose that comes out the back. What's the one above it also that's capped off as well?