Hi guys,

During my the cam install on my '95 I want the EGR bullcrap gone. There's enough other stuff in the way and the smog police can bite my left one

So.... I am honestly not sure WHICH components are part of the EGR on this car... there's just so much stuff!

Also, where can I get block-off plates to bolt onto the intake and onto the EGR bung on my headers (same as stock EGR)?....

If anyone has a diagram showing what all components are part of the AIR and EGR system, I would appreciate it. I already removed the airpump and all but the big long metal pipe (which as I understand I must cut in half to remove?), so what else do I have to remove to get rid of both AIR and EGR? It's a '95 so no OBD2.

Thanks,

Michael

 

Thats strange that your 95 has EGR. Or, maybe it's strange that our 95 TA did not have EGR.

Where is your EGR connected?

Anyway, we just removed the complete AIR system. Elec. pump, and hoses/pipes. The pipe ends just screw out of the front of each exhaust manifold. You will need threaded plugs to close off the holes. The passenger side pipe is attached via a bracket behind A/C compressor. You can't get at the bolt. We just twisted on it till it broke loose. Then bent and bent till we were blue in the face and pulled it up and out of there. It will come out sooner or later. Maybe later...

BTW, we also removed the TCS. There was a large TCS motor sitting in a black plastic box above the driver's side of the engine. It's gone now! Of course we have had to order a new non-TCS throttle cable because of this surgery.

Bottom line..... Now at least you can see the engine. New valve covers and Corvette fuel rail covers are going on next.

Sorry, I have no diagrams.

Ron,

98 TA .. Cam, Heads, Headers car
95 TA .. Procharger

 

The EGR comes out of the passenger-side manifold (or header) and attaches to the rear of the intake manifold, and there's a huge valve thing on the rear of the intake manifold too for the EGR. I know I have 3 holes to block off, but I also want to remove the electrical/vacuum stuff that is EGR related.

As for the AIR, what did you use to plug the holes in the exhaust manifolds? I've got my AIR pump gone, my check valves are off, but I still have the threaded holes in the manifold. I've heard an "M22 drain plug" but if I tell a parts counter drone that, I swear to you I'll get a blank stare.... I also took one of the check valves to a local hardware store and the closest thing to it was a plumbing fitting, but none of them were the right size to thread in...

Thanks,

Michael

 

Well, that explains that valve behind the intake. I sure did not see where an EGR pipe attaches to the pass. side exhaust manifold. Maybe I need to dig a little deeper.

Well, I just talked to my son about that AIR pipe. It wraps around the front of the oil pan. Lots of bends. It's tack welded to a mount behind the A/C compressor. My son did, in fact, cut the pipe when he installed the supercharger (put a small section of plastic pipe in it's place). Anyway, he says just to get under the car and first cut the pipe in half prior to yanking on it. It will break loose from the tack weld, but still needs to be cut first. A real pain in the ****!

As far as the AIR plugs. An M22 was way too big. An M20 oil plug was about right, but the wrong threads. We found out you need a 3/4" X 20. They did not have a plug this size, so I am trying NAPA tomarrow.

When you figure how the block off all the holes from the EGR system.... Let me know.

Ron,

 

BTW, we also removed the fuel tank vapor purge valve and the plastic piping going to and from it. We cut the plastic pipe where it enters the big black plastic convoluted tubing on the drivers side of the engine. There are 3 fuel lines in there. 1 high pressure feed, 1 fuel tank return, and the fuel vapor purge (no pressure, just fumes) You need to put black silicone sealant in the hose so fumes won't be emitted in the engine bay. Our PCV line vacume port is now connected to the throttle body where the fuel vapor purge was originally attached (this is a vacuum port)

 

You will have to cut the air tube in half to get it off if you want to ditch it. The egr just consists of the valve and the tube. I took my old valve and broke off the valve and just saved the base. I then took a piece of thin aluminum(house flashing) and made a metal block off plate to go between the valve base and the intake and i siliconed it. Then i took the tube and cut it and slid the piece that bolts to the intake off the tube and welded the hole shut in it. I then put some RTV on it to help seal it. I have my motor old motor out and my new one 100% assembled ready to go in so if you want some pics to help clear things up i can get them for you.

 

You can get EGR blockoff plates from Steve10: http://www.mycamaroz28.homestead.com/

 

You only need 1 plate to take care of the EGR on the intake manifold. You can order this plate from GM, because the LT4 motors came without EGR and with this plate. I know this because I have one, it only cost $5 or something.

 

Depends on what you are taking off.
I have a 94 and the EGR valve is one block off plate and the tube going from the intake manifold to the exhaust manifold is another hole in the intake manifold you will need to block off. The third hole is in the exhaust manifold, if you are keeping the manifolds I went with Hooker LTs.
Make sure you block off all the appropriate holes.
I also pulled all the vacuum lines and plugged the nipple in the intake manifold but left the EGR solenoid hooked up. I have not finished the header install yet so I can not tell you how it works.
I will let you know.

 

ok i have a 97 with "93" style slp shorties on it, will I only need the 1 block off plate for the valve itsself on the back of of the intake? there is no fitting on my header for egr so i know thats 1 less right off the bat, and my AIR is plugged with M22 drain plugs..

 

Not sure about the OBD2 cars but I would think you are correct.

 

TimbrSS ...

Thanks for the link.

Since the 95 TA has been modified with a Procharger, could someone help me out here a minute:

On your stock LT1, Where does the PCV valve push into? Is it the large hole in the lower side of the intake manifold (drivers side)?

Also ... The other end of the hose that has the PCV valve: Where does it attach to? The throttle body?

Ron,

 

Yeah, I want the EGR completely gone, so it looks like I need 3 block-off plates.

Why What else holds the EGR pipe on the car besides the fact that it is bolted to the header (exhaust manifold) and the intake manifold?? I can't look at it now since I'm at work.

Thanks,

Michael

 

As long as you are completely removing the tube between the intake manifold and the exhaust manifold or header, whichever you have, you only need 1 plate. There are 2 ports on the back of the intake right? One is where the tube comes in, the passanger side, and has 1 hole. The other is where the EGR valve mounts, and its on the drivers side and has 2 holes. Exhaust gas comes in the passanger side hole, flows through porting in the back of the intake, and out one of the holes in the drivers side port. Then, if the valve is open the exhaust flows through the valve and back into the intake through the other little hole in the drivers side port, and into the intake air stream. So, if you either plug the hole in the exhaust manifold and remove the tube, or buy headers without EGR provisions, you can simply blockoff the drivers side port with a solid plate. The hole into the inside of the intake will be closed off, but the porting in the back of the intake will be open. This doesn't matter though, it doesn't go anywhere. I hope this makes sense, and I hope i'm not rambling about something everyone understands already anyway. I know this works though because I just did it.

 

PCV

It goes to a port on the intake manifold, underneath the throttle body.

Lots of pics of things on my Tech Page.