Replacing EGR
By all means, if you're mechanically inclined and very careful, you can do it. A factory service manual is very helpful and almost a necessity. Label all vacuum lines and electrical connectors (there's a lot of em!).
Clean the whole plenum and torx bolts with a stiff brush before you even start. Often, dirt and gunk will build up in the torx bolt holes and that just makes it even easier to strip them (and you don't want to be in a position of having to drill these out). Have a box of baggies available and a stack of index cards, plus a permanent marker to mark what bolts came out of what holes in the plenum. They are different lengths, so beware.
Also, there are TWO torx bolts that are on the INSIDE that attach the lower runners to the intake manifold. Bag these separately! One is on the right front and the other is on the left rear. When assembling the runners, there will be two holes that are behind the injectors. These are the inner torx bolts.
The throttle cable can be laid aside complete. Replace the three bolts where you got them from and note the small cable that attaches to the left side of the throttle body.
There's also a vacuum line that runs underneath the plenum, from the left rear of the plenum box to the AIR diverter valves on the front of the block. Put this vacuum line in place, BEFORE putting the plenum together.
You might not think it's necessary to pull the lower runners, but do you want to risk a vacuum leak? You'll have to loosen them to get the upper plenum box off. Go with a Fel-Pro gasket set.
Also, one of the upper Plenum bolts IS the throttle cable attachment. I thought I lost one of the torx bolts, but after a lot of looking and thinking, I figured it out.
The hard vacuum lines are often brittle, be careful with them.
Finally, when you're assembling the runners and the plenum, torque all the Torx bolts evenly all around and slowly tighten up the whole shebang until they're all tight. The Craftsman long Torx handle set was handy, as there's limited clearance for a socketed Torx. They are torqued hard and will 'crack' when you loosen them.
Have a tubing wrench set to pull the hard power brake vacuum line from the rear undersection of the upper plenum.
There is also a two wire connector that attaches to the air temperature senson right in front of the power brake vacuum. Note this connection.
Here's a link from Corvette Fever on how to pull the plenum
http://www.corvettefever.com/techart...ake/index.html
PM me if you need pics, as I have more than a few, if the link doesn't give you enough. Take lots of pictures as this will help!
Last edited by F22; Oct 7, 2008 at 12:48 PM.
By all means, if you're mechanically inclined and very careful, you can do it. A factory service manual is very helpful and almost a necessity. Label all vacuum lines and electrical connectors (there's a lot of em!).
Clean the whole plenum and torx bolts with a stiff brush before you even start. Often, dirt and gunk will build up in the torx bolt holes and that just makes it even easier to strip them (and you don't want to be in a position of having to drill these out). Have a box of baggies available and a stack of index cards, plus a permanent marker to mark what bolts came out of what holes in the plenum. They are different lengths, so beware.
Also, there are TWO torx bolts that are on the INSIDE that attach the lower runners to the intake manifold. Bag these separately! One is on the right front and the other is on the left rear. When assembling the runners, there will be two holes that are behind the injectors. These are the inner torx bolts.
The throttle cable can be laid aside complete. Replace the three bolts where you got them from and note the small cable that attaches to the left side of the throttle body.
There's also a vacuum line that runs underneath the plenum, from the left rear of the plenum box to the AIR diverter valves on the front of the block. Put this vacuum line in place, BEFORE putting the plenum together.
You might not think it's necessary to pull the lower runners, but do you want to risk a vacuum leak? You'll have to loosen them to get the upper plenum box off. Go with a Fel-Pro gasket set.
Also, one of the upper Plenum bolts IS the throttle cable attachment. I thought I lost one of the torx bolts, but after a lot of looking and thinking, I figured it out.
The hard vacuum lines are often brittle, be careful with them.
Finally, when you're assembling the runners and the plenum, torque all the Torx bolts evenly all around and slowly tighten up the whole shebang until they're all tight. The Craftsman long Torx handle set was handy, as there's limited clearance for a socketed Torx. They are torqued hard and will 'crack' when you loosen them.
Have a tubing wrench set to pull the hard power brake vacuum line from the rear undersection of the upper plenum.
There is also a two wire connector that attaches to the air temperature senson right in front of the power brake vacuum. Note this connection.
Here's a link from Corvette Fever on how to pull the plenum
http://www.corvettefever.com/techart...ake/index.html
PM me if you need pics, as I have more than a few, if the link doesn't give you enough. Take lots of pictures as this will help!

http://www.corvettefever.com/howto/c...uel/index.html
Last edited by 3D-Aircrew; Oct 8, 2008 at 02:45 PM.
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