C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Replacing EGR

Thread Tools
 
Search this Thread
 
Old Oct 6, 2008 | 11:16 PM
  #1  
ride250s's Avatar
ride250s
Thread Starter
Pro
 
Joined: Mar 2008
Posts: 552
Likes: 2
From: Dubuque Iowa
Default Replacing EGR

Anyone have a good step by step picture set?

I am replacing the Solenoid too, Should I also replace the Switch??
Reply
Old Oct 6, 2008 | 11:21 PM
  #2  
Benny42's Avatar
Benny42
Drifting
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2006
Posts: 1,423
Likes: 96
From: Magnolia Tx
Default

I would replace the switch too. It may be your whole problem.
benny
Reply
Old Oct 7, 2008 | 10:40 AM
  #3  
F22's Avatar
F22
Le Mans Master
15 Year Member
 
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
Default

Replace the solonoid first, as that's far easier than pulling the plenum. You can run a new one 'loose' and see if it fixes the problem before going to the trouble of attaching it to the water outlet neck.
Reply
Old Oct 7, 2008 | 11:34 AM
  #4  
ride250s's Avatar
ride250s
Thread Starter
Pro
 
Joined: Mar 2008
Posts: 552
Likes: 2
From: Dubuque Iowa
Default

Originally Posted by F22
Replace the solonoid first, as that's far easier than pulling the plenum. You can run a new one 'loose' and see if it fixes the problem before going to the trouble of attaching it to the water outlet neck.
Well I had a guy at the dealership diagnose the problem and he said it needed both the Valve and the Solenoid. I just didn't want to pay their price to get it fixed so I'm ganna bite the bullitt and do it my self!
Reply
Old Oct 7, 2008 | 12:45 PM
  #5  
F22's Avatar
F22
Le Mans Master
15 Year Member
 
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
Default

I'm not sure what they qouted you, but my local shop qouted me three hours to do it, which was totally fair, considering how hard it is to do.

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.
Reply
Old Oct 7, 2008 | 01:14 PM
  #6  
ride250s's Avatar
ride250s
Thread Starter
Pro
 
Joined: Mar 2008
Posts: 552
Likes: 2
From: Dubuque Iowa
Default

Originally Posted by F22
I'm not sure what they qouted you, but my local shop qouted me three hours to do it, which was totally fair, considering how hard it is to do.

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!
Thanks for the link!
Reply
Old Oct 8, 2008 | 02:20 PM
  #7  
3D-Aircrew's Avatar
3D-Aircrew
Melting Slicks
Supporting Lifetime Gold
15 Year Member
Veteran: Navy
 
Joined: Nov 2007
Posts: 2,830
Likes: 147
From: Gainesville FL
Default More detailed photos removing plenum

This is a corvette fever how too on changing fuel injectors ... many pics

http://www.corvettefever.com/howto/c...uel/index.html

Last edited by 3D-Aircrew; Oct 8, 2008 at 02:45 PM.
Reply
Old Oct 8, 2008 | 03:15 PM
  #8  
AGENT 86's Avatar
AGENT 86
Team Owner
20 Year Member
Active Streak: 30 Days
Active Streak: 60 Days
Active Streak: 90 Days
 
Joined: Jan 2003
Posts: 20,322
Likes: 248
From: Summerland B.C. Canada
Default

http://members.shaw.ca/corvette86/EGR%20System.pdf
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Oct 8, 2008 | 04:18 PM
  #9  
ride250s's Avatar
ride250s
Thread Starter
Pro
 
Joined: Mar 2008
Posts: 552
Likes: 2
From: Dubuque Iowa
Default

Thanks, but I already have the entire manual on a CD-ROM. I just wanted to see some actual pics!


Thanks to everyone!!
Reply

Get notified of new replies

To Replacing EGR





All times are GMT -4. The time now is 09:52 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE