I have a 94 z28 and have read several threads about plugging the EGR but just want to be sure. After capping the headers do I need to plug the two corresponding hoses and also block off the tubing from the intake manifold. Also, do I need to remove anything if I am replacing the optispark cap or it can be done without removing any other part. Thank you

 

There is a single EGR corrugated metal tube, running from #8 primary to the back of the intake manifold. The hole in the header has to be covered with a blanking plate, and it's a good idea to cover the hole on the back of the manifold with a blanking plate. If you remove the EGR valve itself, that hole has to be covered with a blanking plate. Ready made sets of plates are available, or you can make your own. Remove the vacuum line from the driver's side of the intake manifold and put a vacuum cap on the nipple.

When you speak of "hoses", are you possibly confusing the AIR system with the EGR system?

http://shbox.com/1/egr1.jpg

By removing the EGR system, you have done little more than eliminate a system that has no effect on performance when working properly, and can actually help reduce detonation when lugging the engine at low RPM.

 

You are right I am talking about the AIR system rather than EGR. Sorry about that. So if I cap the headers with the metallic plugs I must also plug the corresponding hoses up. And I guess the other metalic hose that I took off to remove the old exhaust manifold is part of the EGR . Putting that back on the headers should be ok? Thanks Also the optispark cap , can I remove it and replace it along with the rotor without removing other major parts. Thanks again.

I am capping the headers because I broke the AIR tube that is located on the passenger side and can't find a replacement. Dealer said it's discontinued. I would rather leave it like it was if I can find the part.

 

There has to be tons of used parts that people took off their cars (since people are always removing the smog stuff). Try a post in the parts wanted forum.

You will need to remove the water pump to get to the opti.

 

Thank you , will do.