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914World.com _ 914World Garage _ Vacuum Hose Question

Posted by: billd Sep 30 2005, 12:16 AM

I finished restoring the D-Jet EFI on my 73 2.0L and fired it up. It runs!

However, I have a few questions about routing the vacuum hoses.

1. There are two vacuum fittings on the distributor. A 5mm fitting on the near side (toward the distributor) and a 3mm fitting on the far side. The 5mm appears to go to a connection on the far side of the throttle body. Where does the 3mm fitting go? I've seen pictures that show it going to a fitting on the near side of the throttle body, but there is no fitting there on my car.

2. There are two 11mm vacuum connections on the side of the plenum toward the battery. Where do these go? Does the connection on the oil filler go to one of them and the decel valve to the other? I've seen pictures with a "F" shaped rubber fitting on one of these connections. Is that fitting needed? If so to route to where?

Thanks,

----Bill

Posted by: Travis Neff Sep 30 2005, 12:37 AM

The larger fitting is your vacuum retard, it goes on the throttle body below the throttle plate, the smaller fitting is your vacuum advance, and it goes to the port above the throttle plate (on the throttle body).

Unless you have a 74+ throttle body, in which case there is no vacuum advance port. If that is the case, don't worry about the advance port on the distributor.

Posted by: billd Sep 30 2005, 12:44 AM

OK, I must have a 74 throttle body. My EFI system is all 74 components.

By "don't worry" do you mean leave the connector open or plug it?

What about the large (11mm) connections on the plenum?

Posted by: Travis Neff Sep 30 2005, 12:54 AM

The factory put a hose on the vacuum advance port, but just left it sitting loose on top of the engine, strange but true. The 11mm ports would be for your decel valve (if you have one, I don't and the hole is plugged), there is another and I believe that goes to the PVC valve at the base of the oil filler neck.

Posted by: Gint Sep 30 2005, 06:33 AM

QUOTE (Travis Neff @ Sep 30 2005, 12:54 AM)
The factory put a hose on the vacuum advance port, but just left it sitting loose on top of the engine, strange but true. The 11mm ports would be for your decel valve (if you have one, I don't and the hole is plugged), there is another and I believe that goes to the PVC valve at the base of the oil filler neck.

Travis is absolutely correct on all counts. The fact is the later 2.0 did not use vacuum advance, just retard.

I tried to run a 74 2.0 through smog in CA once a few years ago. The factory ran that advance hose up near the TB and left it laying there. The more anal SMOG tech must see a hose, or they will fail you on a visual.

Posted by: Bleyseng Sep 30 2005, 08:13 AM

QUOTE (Travis Neff @ Sep 29 2005, 11:54 PM)
The factory put a hose on the vacuum advance port, but just left it sitting loose on top of the engine, strange but true. The 11mm ports would be for your decel valve (if you have one, I don't and the hole is plugged), there is another and I believe that goes to the PVC valve at the base of the oil filler neck.

Nope, the PCV valve at the oil breather goes to the plenum not the air box port on a 73-74.

Posted by: Dave_Darling Sep 30 2005, 09:39 AM

Check the "EFI Hose Diagrams" on the Pelican site.

--DD

Posted by: type47 Sep 30 2005, 10:07 AM

similar to what dd is referring to:

Attached image(s)

Posted by: Travis Neff Sep 30 2005, 10:52 AM

QUOTE (Bleyseng @ Sep 30 2005, 06:13 AM)

QUOTE (Travis Neff @ Sep 29 2005, 11:54 PM)
The factory put a hose on the vacuum advance port, but just left it sitting loose on top of the engine, strange but true. The 11mm ports would be for your decel valve (if you have one, I don't and the hole is plugged), there is another and I believe that goes to the PVC valve at the base of the oil filler neck.

Nope, the PCV valve at the oil breather goes to the plenum not the air box port on a 73-74.

That is what I was saying.

Posted by: billd Sep 30 2005, 12:42 PM

Is there a separate PCV valve in the line from the oil filler to the plenum or is this valve built into the oil filler somehow?

Posted by: Travis Neff Sep 30 2005, 12:50 PM

The PVC valve is at the base of the filler assy. It is a white plastic disc, you can remove the filler assy from the case and unscrew the PVC vavle from it and replace. Cheap from the dealer, just a couple bux.

Posted by: Gint Sep 30 2005, 04:51 PM

niggly little bit...

PVC is some form of plastic.

PCV is Positive Crankcase Ventilation

It's beer:30!!!!!!!!!!!!!!!

Posted by: Travis Neff Sep 30 2005, 07:39 PM

At least I got the common demoninator, it is all plastic..