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I own a 1985 Corvette 4 plus 3. I purchased the car not running. I removed the engine, changed the cam, did a valve job, new harmonic balancer, water pump and some other incidentals. I am reinstalling the engine. I bought a chip that has the EGR and VATS shut off. I removed re-circulation piping from the the exhaust manifold, welding. I had help disassembling the engine. So documentation was not good. I am presently trying to determine the routing for the crank case venting. I have the tubes but I do not know where everything goes. Do you have any pictures of the crank case vents installed. Is it pictured anywhere in the FSM, I have a copy.
Does the CCVconnect to the EGR or Air pump. Can I just run a vacuum line from the valve covers to the air intake plenum? Or is it more complicated than that.
Thank you all
And Merry Christmas
Last edited by jseremba; Dec 24, 2018 at 01:04 AM.
Reason: update
I just got a look at the PCV piping on page E6-139. The aluminum pipe is not pictured. I am removing the EGR and air pump. Do I need the Aluminum pipe.
Not sure which pipe you are talking about as their are 2. One is for the air pump, of which you wont need. It's the large U shaped one that goes from both sides of the engine to where the air pump goes to. Their is another pipe that goes between the driver head and the TPI unit. This is what the PCV hooks to. One end goes to the port in the TPI base on the drivers side. The other side has two ends. one goes to the PCV via another hose and the end goes to the charcoal canister. You don't need it as you can use aftermarket fittings to make it all work but that pipe makes things easier.
First of all thank you for the help. I actually found those diagrams in the FSM last night. And as mentioned in a previous post one of the PCV goes in at the TB the other into the manifold. And it seems that neither of them have anything to do with the aluminum pipe.I though that the pipe was part of the CCV and therefore connected to the PCV. From the diagrams I can see it is not.
So is the aluminum pipe part of the air pump?
This is the pipe I am talking about. It obviously hangs on the fuel rail. I thought is was part of the PVC but obviously not. My son in law sent me pics but the intake plenum blocks the view.
Merry Christmas. That pipe is the crankcase tube. You can kinda see it in the top pic that Tod Stiles posted. Flip it over and you'll see,
it goes on the driver side under that wire cover. It connects the intake manifold to the PCV valve and the purge control solenoid. That diagram will get you on track.
First of all Merry Christmas.
This is an awesome post. So from what I see in the diagram. That pipe is part of the EGR and canister, which I plan on removing and have deleted from my ECM via a new chip. So all I need to do is run the lines to the PCV, correct?
Thank you and Merry Christmas.
I plan on removing the air pump. Is this pipe part of the air pump and the canister?
No that is the vacuum line from the manifold to the PCV valve. I ditched the A.I.R. on my car ('86 so very similar)
when the pump failed but I kept the Evaporative Canister. It costs zero HP and cuts down on gas fumes
escaping from your car. I'm no environmentalist but i can't think of a good reason remove the Evap Canister.
I sincerely appreciate all of the help from you guys. I could not believe the way the guy helping me. Just started removing parts. But, he has been an asset.
Okay so looking at the diagram. Which is great.I can see that the PCV on the drivers side goes to the canister and does not involve the pump. So no problem it stays. I am thinking that the pipe is the under the plenum and connects to the EGR valve. Am I correct? If so I can remove it.
Its not the EGR tube. It is the vacuum line from the intake manifold to the PCV valve and the EVAP canister.
It is hidden in the top pic under a plastic wire loom cover. That tube is this in the diagram.You need it on the car.
Will do and thank you.
Let me explain something to all of you very helpful people. I am living in Guam. The car is on base at what is called the auto hobby shop. I only have access to the car on Friday afternoon, Saturday and Sunday. So going out to the car and physically verifying and trying to fit the piece when you graciously respond is impossible. But, thanks to you all I really think I will be able to put it back in it's proper location.
Really awesome of you people to help me out like this.
I think its great that you are restoring an early C4. That can be a real job on the mainland where we have decent
parts availability so i tip my hat to you. Good luck with the project and i'll help where i can.
Thank you so much. The previous owners wanted to make it into a Batmobile. Yes a Batmobile. They did some customizing under the hood and in the wiring. Preliminary the wiring does not look too bad.
Seriously Thank you all. Your help has made this Christmas away from home much easier.
First of all. THANK ALL OF YOU. Because this is driving me crazy. If I were home I could drive a block or two and find a car to look at.
Okay so I thought the tube hung on the fuel rail. But looking at the diagram and the tube. I am thinking that the tube is actually held in place by the valve cover bolts. I tried to upload a picture. Did not work.
But,
i think that the tube is bolted to the engine using the valve cover bolts on the driver side. The tube inserts into the intake and connects to the PVC and the charcoal canister on the drivers side and the PCV valve on the passenger side is connected via the black tube and rubber hose to the front of the throttle body So the placement in the picture is wrong the tube should be on the head and bolted with the valve cover bolts. The part with the 90 degree in certs into the intake manifold in the hole just under the fuel rail.
.
Here is where that tube goes. It looks as though it may be bent up which may be adding to some of the confusion. There is a stud where I indicated but you could use a bolt there too. It connects to the intake under the runner where indicated with a short piece of rubber hose. Hope this helps, post any other questions and I'll try to help you out. pcv tube routing
Thank you for the definitive picture.
When I placed the tube on the fuel rail I realized it would not work. But, looking at the picture of it on the fuel rail and the diagram I realized that the vacuum lines to the canister run along the valve cover. So the tube had to mount on or near the valve cover.
Crankcase venting
