After I installed my engine I had a vacuum nipple that was not going to anything so I plugged it. Now I am wondering if it is supposed to go to anything. I have looked through out my FSM and the Hayes book and cannot find it. This is on my '91 Turbo

It is on the upper intake manifold on the drivers side. It is right where the upper manifold meets the lower manifold. It is right near the second intake runner. The first being the closest to the fire wall. So what is it?

James

 

A picture would help a lot. Not that I'll probably know...

 

hmmm! thats where i have my boost sensor plugged in and its also Tee'd in with my blow off valve vacuum hose.

but i have removed my asv.

make sure the boost sensor is plugged in somewhere (lil black box drivers side) and also check the air bypass valve (stock blow off valve).. its a black plastic valve with large pipes (after turbo, before intercooler) and a single vacuum line

 

right under the bac vavle?? that is blocked off from the fatory. good place for a gauge.

 

Sweet...I will snap a picture just to make sure we are on the same page. Man, if that was blocked from the factory...that is a great place for a gauge!

James

 

I was wondering the same thing, though i have an N/A. What is that little nipple there for anyways if its just blocked from the factory? Is it for testing purposes?
Thanks

 

for a boost gauge? pic pic pic

 

Hmmm...on 1986-1988 Zenki models, tha vacuum fitting was for the stock CBV/BOV...



-Ted

 

Here is a picture of my nipple (On the intake manifold)

It has a black vac. cap on it. on the bottom of the picture.

So is that the one that is supposed to be capped?

James

 

Alright!&nbsp I see you got that stupid hose under the BAC valve clamped down!



-Ted

 

I had that going to my stock BOV.

 

So whats wrong with clamping it?

 

Nothing, just that Mazda doesn't do this from the factory, and it's a cause of a LOT of intake vacuum leaks!




-Ted

 

Yeah, I went clamp crazy on everything clampable So is the nipple in the picture the one that is capped?

Thanks James

 

Yeah, that normally goes to the stock CBV or BOV.
Do you have an aftermarket BOV installed?
Is your car stock?


-Ted

 

Yeah, stock as far as that system goes. Huh, that is intresting. Wonder if that was hooked up to anything. Could have that been for the cruise control for the earilier cars?

 

Nah, cruise control on a Turbo II is linkage activated.

What is your stock CBV hooked up to???


-Ted

 

Not sure it is on the ground Lemme swing by the garage and look at my vac. diagrams.

James

 

Well, I looked at the Vacuum diagram in the Hayes book. And well it shows the small vacuum line going to that vac port in the intake manifold. Now the question is what was mine hooked up too? Wonder if that was affecting anything?

James

 

This is a picture of what is in the hayes book. Don't know why I didn't see this before.

James

 

Yep, that's how it's supposed to be!&nbsp What is your CBV hooked up to???


-Ted

 

Well murder she wrote! I looked at the pictures I took before I pulled my engine and it looks like what is in the picture. So the BOV was supposed to be hooked to that nipple and my boost sensor was supposed to be connected to the ACV.

I have no idea if it was like that when I bought the. I guess the two options are I screwed it up when I installed the boost gauge or it was like that before.

So what negative effects can you think of with my boost sensor and my BOV being on the same vacuum line?

James

 

NUN.

 

My boost sensor, BOV, and boost gauge are on the same line. I moved the boost gauge off the back of the manifold because I couldn't get a zip tie on the line.

 

Well, the Hayes diagram was wrong. I looked at my FSM again and apparetly that nipple is plugged.

James