mack123

iTrader: (4)

hello all,

Ive been doing a lot of work on my 88 turbo and I changed all the vac lines.
I have a question about a connection that I cant find thru the fsm or manuals.

If you stand on the drivers side and look at the solenoids, you have..

the grey solenoid- which has 2 hose connections- one goes to vac source and one goes to the Air Control Valve- I will call this hose that goes to the ACV- hose #1

the blue solenoid- which has 2 connections, and both hoses go to the ACV also.
one hose { hose # 2 } goes out the top of the solenoid, and the other { hose # 3} goes out the front of the solenoid

Now if you stand on the passenger side of the car and look at the ACV, you have these 3 port connections from the solenoids at about 12, 3, and 6 o'clock

My question is.. which hoses from solenoids { 1,2, and 3} connect to which ports on the ACV { 12, 3, or 6 o'clock} ???

HAILERS

The GREY switching solenoid goes to the nipple on the acv that sticks straight up. This is the only hose that supplies VACUUM to the acv.

The RELIEF solenoid........it matters not which of these two hose go. One on the middle of the acv. Its a nipple that sticks straight out at you. If the engine is running and you take the hose off that nipple, you'll get air pressure out of it on the acv side.

The other RELIEF solenoid hose goes to the very bottom of the acv.

The way the RELIEF solenoid works is that it gets air pressure from the acv's middle nipple. And if the RELIEF solenoid has a signal to open, then it routes that air pressure right back to the acv but to the bottlom nipple on the acv. Those two are air pressure.

Make any sense? P.S. the turbo works different than the non turbo acv.

HAILERS

OOOps. Changed my mind about the Relief solenoid. The top hose on the Solenoid should make a path to the bottom of the acv. The hose on the solenoid that points straight towards the center of the engine should go to the middle nipple on the acv...the one that sticks straight out and is air pressure from the airpump.

I changed my mind about it not mattering, because you'd want to bleed off the air pressure on the bottom of the acv once the Relief Solenoid is engergized again. Makes sense to me. It might not matter at all. I'll play with it someday next year.

HAILERS

And while we're here, you might want to see if the acv is worth a hoot. Put a piece of vacuum line on that top nipple on the acv (switching) and suck on it. It should hold a vacuum. If not, then it's no good and won't work and makes the rest of the acv useless.

Do the same with the bottom nipple (relief). Except blow on that nipple. The valve inside should move upwards (look in the large nipple on the bottom of the acv). If the valve does not move then that relief diaphram in the acv is bad and the acv is useless.

mack123

iTrader: (4)

Thanks hailers, this is great info and I need it to hook up the car today.

Although I like to keep things stock, I found vac hose that comes in five different colors, orange, grey, blue and green,yellow too. I have matched the vac solenoids with the same color vac hose { I think the hose is better than stock, its heavy duty stuff } so I can trace the lines in an instant plus it looks really cool.

I admit I will have to read you responses a few tims before it clicks in my head and I see how it works. I pulled my ACV, and removed the accesible covers, and checked everything.

You are right, they do go bad. Although my car had only 72,000 on it, the bottom diapram {sic}was baked like a tortilla chip and crumbled. I replaced it with a good spare.
It works like a champ now.

Thanks again for taking the time to reply, this will correct the prob.