ZorroZ

At the front of engine bay, very close to the headlamp, there is a black box that has two vacuum lines connected to it, there is a third that has a blue stripe on it, but its disconnected from the black box (is that normal). My z in an 86 non-turbo model. So my question is, where do these hoses end up at, because they all are broken/disconnected at the other end, near the right side of the battery, hence I believe this is the reason that I have NO airflow in the interior of my car, which by the way makes driving during a downpore really nice seeing how I have to leave my windows down, or pull over. (No Defog)
PS if at all possible could I get pics of where these hoses go.

ZorroZ

could these disconnected hoses have anything to do with engine performance being slightly sluggish?

ZorroZ

ok, i think i have the blue striped hose to the plenum figured out, the plenum is the y shaped junction that is to the right and above the EGR valve. Now theres suction coming from the plenum, is this supposed to supply the vacuum to the vacuum resevoir by the headlamps? Then from the resevoir the other 2 hoses, 1 goes through the firewall (the red striped one) and the other 1 (the white striped one) goes where?

z31driver

On the firewall, engine side, has heater hoses from and to. A round silver cylinder with a nib on top.

ZorroZ

thanks, found the bugger.

ZorroZ

heres a picture of the hose hookup, could someone let me know if this is right?

z31driver

photo attached

ZorroZ

is this the same for a non turbo

ZorroZ

and what does the b/l, b/r, and b/w stand for on the hoses coming from the vacuum tank?

z31driver

Turbo includes a pump, otherwise the same

z31driver

black/lavender
black/red
black/white

HeRo ShiRo

hey my car caught on fire cuz of theze hoses...the heater valve to which one of tha small hoses connects to set on fire the other day when i wuz drivin and tha top part burned off.. ima replace tha hoses and tha valve now, but do u think in tha meantime the car will start a fire again?? hot air is alwayyz comin through the upper vents...

AZ-ZBum

Not sure how your car could have caught fire from those hoses. There is nothing flamable ever running through them. It's air in the vacuum lines and water going through the water ****. Only thing I can think of is the hoses to the fuel pressure regulator are wrong and the FPR started leaking. But even that is far fetched.

And the reason you have hot air always coming through the vents is because there is a vacuum leak, or the hoses are not hooked up properly.

HeRo ShiRo

what is the FPR and where is it located??? it wuz strange to me too outta nowhere tha heater valve started burning..

AZ-ZBum

http://z31.com/fpr.shtml

HeRo ShiRo

hey thanx for that link, now how do i de-pressurize the fuel system ??

AZ-ZBum

Read the Haynes manual for instructions.

otherd

If it helps, I just replaced every inch of vacuum hose under the hood of mine with silicone hoses so I have a pretty good idea what goes where. That canister is a vacuum reservoir for the climate control. Lets the valves for your ac/heater system operate a few times after shutting off the engine.

Have no idea how you could catch one on fire unless it got too close to the exhaust at the rear of the engine or the EGR.

HeRo ShiRo

hey where does tha lil hose connect to from the heater valve?

Lakesidez

What is this piece that i have marked on the drawing. On mine it's just a typical plastic splice connector, is this thing some one way valve? Does anyone know what it is?

OmicroN

It's also good to remember that even a simple crack in any hose could cause your car to have a loss in power. It'd be best to get all of your hoses checked, meaning make sure their all fitted well and not broken.

otherd

I don't seem to have that on mine. A one way valve is a good guess. Those are usually shaped like a disc with a inlet tube on each side.

As long as we're talking hoses here, the best quick fix for a older car is to cut off the last 1/2 inch or so of each line and re-attach them. (assuming you have enough slack in the hose) The ends usually stretch and harden that way. I had a couple hoses on mine that I thought were PVC they were so hard.