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Vacuum Diagram
https://slantsix.org/forum/viewtopic.php?t=43395		 Page 1 of 1
Author:  krytellan [ Thu Jan 27, 2011 6:55 am ]
Post subject:  Vacuum Diagram
This is the one frustration I never missed about old cars for the 10+ years I had newer ones. How does one go about finding a vacuum diagram for an F-body /6? I have a couple vacuum hoses hanging loose and no idea where they go.

Any suggestions?
Author:  Reed [ Thu Jan 27, 2011 8:39 am ]
Post subject: 
One good thing about Autozone's website are their online repair manuals. Granted, these manuals are scans from Chilton's and Haynes books, but for things like wiring and vacuum diagrams, it is quite handy. I just looked it up and the website has all the vacuum diagrams for the 76-80 F-body vehicles.

Also, look around under your hood. There should be a factory sticker that shows the vacuum hose routing. It could be on an inner fender support or stuck to the bottom of the hood. It should be roughly 5 inches square and white.
Author:  olafla [ Thu Jan 27, 2011 10:26 am ]
Post subject: 
What car/year, 1 or 2 barrel carb, California or not, EGR or not?

Pics?

Olaf.
Author:  krytellan [ Fri Jan 28, 2011 3:45 pm ]
Post subject: 
Reed, you rock. I had no idea AutoZone did that and I was able to find my diagram. I do have one question unclear from the diagram. Olaf, I have a '80 (EGR) Volare 225 1 bbl, not CA.

Please refer to following picture, noting the 2 blue caps.

Image

So, I have the line running from the OSAC to the distributor. The object on the left is the vacuum solenoid. I have all other lines attached according to my diagram but it makes no mention of these secondary ports on these 2 objects. Logic dictates that I connect the 2, thereby creating a vacuum to the air cleaner assembly, but I don't want to do it based on my whim.

Anyone know what I do with these two vacuum ports?

Also, if someone knows what that plugged line in the background (comes off a T) feel free to let me know.

Thanks?!
Author:  Reed [ Fri Jan 28, 2011 3:57 pm ]
Post subject: 
There is supposed to be a vacuum line going from the distributor to the OSAC valve. You will be happiest bypassing the OSAC valve entirely and plugging the distributor vacuum advance directly into the carb.

What is odd is that you have a station wagon and a one barrel carburetor. Unless you car was originally sold in California, it should have a "Super Six" two barrel carburetor.
Author:  krytellan [ Fri Jan 28, 2011 4:06 pm ]
Post subject: 
How would I run that bypass? And how do I address the 2 capped ports?

And the car was made in Newark, DE as per the VIN code. I don't think from my research a 1 bbl is unusual at all for a wagon.
Author:  hantayo13 [ Fri Jan 28, 2011 4:09 pm ]
Post subject: 
plug dist into ported vac on carb....with gauge no vac at idle/vac when rpm up...both those plugged blue are part of leanburn system....not sure if you want to elimate untill you change ingition system
Author:  krytellan [ Fri Jan 28, 2011 4:11 pm ]
Post subject: 
Oh goodness. As far as I know I'm not supposed to have a lean burn system.
Author:  krytellan [ Fri Jan 28, 2011 4:19 pm ]
Post subject: 
Let me know if I need to just stop, back-up, and educate myself more. I have an Orange Box and a Holley 1945 carb. That means no lean burn, correct?
Author:  Charrlie_S [ Fri Jan 28, 2011 4:27 pm ]
Post subject: 
Quote:
both those plugged blue are part of leanburn system....not sure if you want to elimate untill you change ingition system
I don't think so. The one blue plug is on the osac valve, and that is on non lean burn. Lean burn does not use a vac distributor, so no osac valve. The other blue cap, looks like it is on the EGR vac switch. EGR is not lean burn only. I don't think he has lean burn.
Author:  krytellan [ Fri Jan 28, 2011 4:29 pm ]
Post subject: 
So the idea would be to route the carb directly from the "To distributor spark advance control" directly to the dist, bypassing the air cleaner completely?
Author:  Reed [ Fri Jan 28, 2011 4:35 pm ]
Post subject: 
Yes, bypass the OSAC on the air cleaner completely. Run the hose straight from the carb to the distributor.

No, you don't have lean burn.

I believe the vacuum cap on the vacuum solenoid is actually covering up a vacuum bleed. You should remove that cap.

From 77-79, all Aspen/Volare slant six station wagons, except for ones sold in California, got Super Six two barrel carbs. I am not sure about 1980, but I believe it was t least an option on wagons, if not standard.
Author:  olafla [ Fri Jan 28, 2011 5:12 pm ]
Post subject: 
Silly question maybe, but could this be a lean-burn engine, partly converted to one barrel? That would explain the missing vacuum line to the distributor, it may not have a use for it.

Olaf.
Author:  Reed [ Fri Jan 28, 2011 5:27 pm ]
Post subject: 
Possibly. However, he should have a factory vacuum diagram sticker either on the bottom of the hood or on one of the inner fenders. Look hard, it is there. THe factory vacuum diagram would say exactly what carb the car was originally built with.
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