EGR system question... - Off-Road Forums & Discussion Groups
Suzuki GEO All Discussion of all things, Suzuki and GEO

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 02-25-2003, 02:37 PM Thread Starter
 
Join Date: Jul 2002
Posts: 320
Thanks: 0
Thanked 0 Times in 0 Posts
 
EGR system question...

Not Zuk specific, but could relate to a Zuk.

I am working on a friend’s pickup. The EGR valve “nipple” snapped and the valve need to be replaced. Here is my question; aside from the vehicle not passing a smog inspection, are there any drawbacks to blocking the system off and running the vehicle with the EGR system disabled?

The dealer told her that the valves would burn if it was not working correctly, but that just doesn’t ring true. It seems like the engine would actually wind up running on the rich side.
mjklm is offline  
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 02-25-2003, 03:14 PM
 
Join Date: Aug 2002
Posts: 549
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: EGR system question...

If he does a lot of highway driving then yes he will most likely burn valves. But city driving he should be fine. I had a chevy half ton with a 305 and I didn't halve the EGR valve hooked up and it was fine. I only went down the expressway once in a while but never did any long highway trips.
4x4_Austin_Mini is offline  
post #3 of (permalink) Old 02-25-2003, 06:09 PM
Keyboard Implanted
 
Nowhere's Avatar
 
Join Date: Mar 2001
Location: Altamonte Springs FL
Posts: 3,333
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: EGR system question...

I'd like to know this one too. My egr may not be working right, could it be removed with the weber and have highway driving?
burning valves? Why?
Nowhere is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 02-25-2003, 08:13 PM
Moderator
 
dparker's Avatar
 
Join Date: Jan 2001
Location: Arkansas.Paragould
Posts: 4,427
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: EGR system question...

all my zuks fisrt thing i junk ! 1 dail driver 1 trail rig ANd no burnt vavles ..
dparker is offline  
post #5 of (permalink) Old 02-25-2003, 09:53 PM
 
Join Date: Aug 2002
Posts: 549
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: EGR system question...

It's not garenteed to burn valves, I'm just warning you that it could.
4x4_Austin_Mini is offline  
post #6 of (permalink) Old 02-26-2003, 02:23 AM
Way Outta Control
 
Join Date: Sep 1999
Location: usa
Posts: 10,815
Thanks: 0
Thanked 1 Time in 1 Post
 
Re: EGR system question...

The purpose of the EGR Valve is to lower combustion temperature
a tad.
Introducing a little exhaust gas into the cylinder spaces
the molecules apart slightly, lowering temperature from
slightly above 3000 degrees where oxygen welds itself to
nitrogen, forming oxides of nitrogen.
With EGR it's down around 2900 degrees, much less NOx formation.

Today's engines run very lean, raising the temperature,
making the EGR important for the cooling.
Often when the EGR is disconnected it'll cause ping, sometimes
you can hear it, sometimes not. Even when you can't hear it
that ping raises the temperatures even higher, burning valves,
pistons etc.

If you can, richen the engine slightly, rejet the carb (adjusting
the idle mixture screws won't do it), or cause the injection
system to run a bit richer.
It also helps to set the timing lower by about 5 degrees from
stock, lowering the temps.

The old engines in the 70's the EGR was an add-on, but later
engines EGR was designed into them, so it's more difficult to
bypass it with safe results.

The reason city driving isn't as detrimental is it's not
held at a sustained high RPM for a long time - sooner or
later you enconter a traffic light or reason to slow down,
letting the combustion chamber cool.



RRich is offline  
post #7 of (permalink) Old 02-26-2003, 09:29 AM Thread Starter
 
Join Date: Jul 2002
Posts: 320
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: EGR system question...

Thanx Rich. This is what I was looking for. I spoke to the dealer again and he finally admitted that it would take a long while (on the order of months) for any of the damage to start to show regardless of where the vehicle is driven.

We would eventually get the system functional as it is just a matter of getting the part really, but she needs the vehicle to be drivable now while we wait.
mjklm is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome