1987 egr tube help - CorvetteForum - Chevrolet Corvette Forum Discussion

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

1987 egr tube help

Old 10-26-2018, 02:31 AM
  #1  
nmay
Junior Member
Thread Starter
 
Member Since: Nov 2017
Posts: 49
Thanked 0 Times in 0 Posts
Default 1987 egr tube help

Hey corvette vans. Iv got a 87 c4 with a small problem. The egr exhaust tube going over the passenger valve cover is leaking and making a tapping noise, smoke test proved it. Iv paid a mechanic to tighten the crimp ring but they said itís wallered out and as tight as it can get and itís replacement is discontinued. I want to buy a delete plate for it because itís not only making a bad noise but itís in the way of taking my valve cover coming on and off. If I do this, Iím not sure what to do with the exhaust end of the tube. Can I just buy regular shorty headers for a small block or should I just have it plug welded? Iíd like to put on regular shorty headers without the egr tube hole and extra little tubes running along the top of headers, but is it that easy ?
nmay is offline  
Old 10-26-2018, 10:47 AM
  #2  
Kevova
CF Senior Member
 
Kevova's Avatar
 
Member Since: Sep 2013
Location: near the thumb in the mitten
Posts: 3,153
Thanked 301 Times in 285 Posts
Default

Disabling EGR could lead to spark knock. Adjusting timing back would compensate. You could look for used replacement corvette salvage. eBay, f body salvage, etc. EGR delete kits are available with plates and a plug for intake.
Kevova is offline  
Old 10-26-2018, 11:53 AM
  #3  
nmay
Junior Member
Thread Starter
 
Member Since: Nov 2017
Posts: 49
Thanked 0 Times in 0 Posts
Default

Originally Posted by Kevova View Post
Disabling EGR could lead to spark knock. Adjusting timing back would compensate. You could look for used replacement corvette salvage. eBay, f body salvage, etc. EGR delete kits are available with plates and a plug for intake.
they make a plug for the exhaust hole on the back of the manifold? because all thatís holding it on is crimp ring and thatís wallered out. Howís a plug supposed to stay in without welding it ?
nmay is offline  
Old 10-26-2018, 12:00 PM
  #4  
nmay
Junior Member
Thread Starter
 
Member Since: Nov 2017
Posts: 49
Thanked 0 Times in 0 Posts
Default

Originally Posted by Kevova View Post
Disabling EGR could lead to spark knock. Adjusting timing back would compensate. You could look for used replacement corvette salvage. eBay, f body salvage, etc. EGR delete kits are available with plates and a plug for intake.
or what year corvette has the manifold With the egr tube that bolts on from both ends, and will it fit on my car?
nmay is offline  
Old 10-26-2018, 12:00 PM
  #5  
Kevova
CF Senior Member
 
Kevova's Avatar
 
Member Since: Sep 2013
Location: near the thumb in the mitten
Posts: 3,153
Thanked 301 Times in 285 Posts
Default

Post pictures of what you have. There are different types of block offs.
Kevova is offline  
Old 10-26-2018, 12:23 PM
  #6  
Kevova
CF Senior Member
 
Kevova's Avatar
 
Member Since: Sep 2013
Location: near the thumb in the mitten
Posts: 3,153
Thanked 301 Times in 285 Posts
Default

Once plate is installed on exhaust manifold no exhaust will go to intake. Plug/ plate just covers hole. Disconnect or remove EGR valve to prevent possible vacuum leak if valve opens. ECM will still command EGR to come on, blocking hose to valve MAY prevent code since solenoid will still function. EGR also uses a temp sensor you may need a resistor to get trick ECM to prevent code.

Last edited by Kevova; 10-26-2018 at 12:29 PM.
Kevova is offline  
Old 10-27-2018, 12:15 AM
  #7  
jv9999
CF Senior Member
 
jv9999's Avatar
 
Member Since: Jan 2014
Location: Lunenburg MA
Posts: 1,069
Thanked 67 Times in 67 Posts
Default

I've had my '87 blocked for a couple years now, no codes and no knock. Timing is on spec at 6 degrees.
jv9999 is offline  
Old 10-27-2018, 01:15 PM
  #8  
nmay
Junior Member
Thread Starter
 
Member Since: Nov 2017
Posts: 49
Thanked 0 Times in 0 Posts
Default

This is the egr tube I just bought. Itís exactly like the one I have thatís leaking. Maybe this new one will be less wallered out. My question is, how do I block off the manifold side of the tube because there is no flange with bolts. Itís just a hole with a crimp ring?
nmay is offline  
Old 10-27-2018, 05:19 PM
  #9  
aguilar92c4
Junior Member
 
Member Since: Jun 2017
Posts: 27
Thanks: 0
Thanked 3 Times in 3 Posts
Default

Originally Posted by nmay View Post
Hey corvette vans. Iv got a 87 c4 with a small problem. The egr exhaust tube going over the passenger valve cover is leaking and making a tapping noise, smoke test proved it. Iv paid a mechanic to tighten the crimp ring but they said itís wallered out and as tight as it can get and itís replacement is discontinued. I want to buy a delete plate for it because itís not only making a bad noise but itís in the way of taking my valve cover coming on and off. If I do this, Iím not sure what to do with the exhaust end of the tube. Can I just buy regular shorty headers for a small block or should I just have it plug welded? Iíd like to put on regular shorty headers without the egr tube hole and extra little tubes running along the top of headers, but is it that easy ?
you cant just delete EGR with a delete plate, it has to be turned off in the chip, you need new chip made man. Find someone who does custom programming.
aguilar92c4 is offline  
Old 11-06-2018, 01:31 PM
  #10  
kael
CF Senior Member
Support Corvetteforum!
 
kael's Avatar
 
Member Since: Nov 2015
Posts: 874
Thanked 74 Times in 70 Posts
Default

It should have a flange on both sides for an '87.
kael is online now  
Old 11-07-2018, 12:31 PM
  #11  
ctmccloskey
CF Senior Member
Support Corvetteforum!
 
Member Since: May 2001
Location: Fairfax Virginia
Posts: 553
Thanked 126 Times in 116 Posts
Default

I would strongly suggest that you keep the EGR and keep it in a functioning mode. I have a 1988 and my car failed Emissions testing due to high NOX, My EGR had failed and I would have never known except for the less smooth idle and FAILED Emissions test.

You can either replace all the components and make it work or you can make the change to disable it and have to update the current E-Prom. I chose to fix mine and that was quite a task. I ended up changing out the EGR valve, the EGR Vacuum Solenoid, fuel pressure regulator, fuel injectors, cold start injector and a lot of gaskets. My vacuum solenoid was a source of constant vacuum loss as it failed in that mode. That is probably what led the rest of the parts to fail. I took off most of the intake system to get in there but it was worth it. Now the car looks better as I painted the parts while I had it apart and the EGR is again working like they designed it too.

Somebody who is creative can find a way to re-attach the EGR tube for you, try a exhaust shop where they weld exhaust parts, maybe they can braze it on or use silver solder to make a permanent connection. If what kael says is correct then it should not be a big deal to replace the tube. The picture above from EBAY shows the EGR tube for the 1988 and up, it is like the one I have on my car, only one flange. Here is a picture from EBAY showing the 1987 type that our friend kael was telling you about. Good Luck and may this help you a bit!

ctmccloskey is offline  


Thread Tools
Search this Thread
Sponsored Ads
Vendor Directory

Contact Us About Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: