Can a bad EGR valve affect MPG? - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus Tech Discussions > General Technical Chat

General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

Search This Forum | Image Search | Advanced Search    
FocusFest FocusFanatics Merchandise

Reply
 
LinkBack Thread Tools Display Modes
Old 11-29-2012, 10:31 AM   #1
Focus Enthusiast
 
Join Date: Nov 2011
Fan#: 91777
Location: Belvidere, IL
What I Drive: 2003 Pitch Black ZTS Sedan

Posts: 217
Points 2,131, Level 27
Points: 2,131, Level: 27 Points: 2,131, Level: 27 Points: 2,131, Level: 27
Level Up 88% Completed
Level up: 88% Level up: 88% Level up: 88%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 1 PWGuy Good Standing Member
Buy-Sell-Trade Rating: (0)
Question Can a bad EGR valve affect MPG?

I'm just curious if a bad EGR valve decrease gas mileage? I am pretty sure mine is still good (I know how to test it to confirm) but was just curious if this affects MPG if the EGR is bad? And if it's "not performing well" or completely failed, will a code ALWAYS be thrown?

Also, does a bad DPFE decrease gas mileage? And does it ALWAYS throw a code when it's not performing well or completely failed?


PWGuy is offline  
    Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 11-29-2012, 11:21 AM   #2
I Speed Often.
 
starfuryt550's Avatar
 
Join Date: Jan 2005
Fan#: 18440
Location: Plymouth,, MI
What I Drive: Audi S4, Turbo ZX3

Posts: 4,214
Points 23,735, Level 94
Points: 23,735, Level: 94 Points: 23,735, Level: 94 Points: 23,735, Level: 94
Level Up 39% Completed
Level up: 39% Level up: 39% Level up: 39%
Forum Activity 31%
Activity: 31% Activity: 31% Activity: 31%
FF Reputation: 23 starfuryt550 Great Standing Member
Buy-Sell-Trade Rating: (58)
Yes it does. A bad valve or if you use a tune to kill the EGR valve will lower MPG.
__________________
Daily: Audi S4 b5 | Project: Turbo ZX3
starfuryt550 is offline  
    Reply With Quote Quick reply to this message
Old 11-29-2012, 11:26 AM   #3
Focus Enthusiast
 
Join Date: Nov 2011
Fan#: 91777
Location: Belvidere, IL
What I Drive: 2003 Pitch Black ZTS Sedan

Posts: 217
Points 2,131, Level 27
Points: 2,131, Level: 27 Points: 2,131, Level: 27 Points: 2,131, Level: 27
Level Up 88% Completed
Level up: 88% Level up: 88% Level up: 88%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 1 PWGuy Good Standing Member
Buy-Sell-Trade Rating: (0)
Will it always throw a code if bad? Reason I ask is that I've read the DPFE can be non-performing (supposedly not "completely" bad) and not throw a CEL or equivalent.
PWGuy is offline  
    Reply With Quote Quick reply to this message
Old 11-29-2012, 11:37 AM   #4
w/ my magic bag
 
felixthecat's Avatar
 
Join Date: Nov 2010
Fan#: 80663
Location: Renton, WA
What I Drive: '05 Silver Sport Technologies

Posts: 12,890
Points 14,252, Level 77
Points: 14,252, Level: 77 Points: 14,252, Level: 77 Points: 14,252, Level: 77
Level Up 51% Completed
Level up: 51% Level up: 51% Level up: 51%
Forum Activity 100%
Activity: 100% Activity: 100% Activity: 100%
FF Reputation: 68 felixthecat Excellent Standing Member
Buy-Sell-Trade Rating: (0)
[QUOTE=PWGuy;4475786]I'm just curious if a bad EGR valve decrease gas mileage? I am pretty sure mine is still good (I know how to test it to confirm) but was just curious if this affects MPG if the EGR is bad?
>>>A stuck egr valve stuck open will make the motor run cruddy.<<<
Quote:
Originally Posted by starfuryt550 View Post
Yes it does. A bad valve or if you use a tune to kill the EGR valve will lower MPG.
How does having the egr closed or turned off w/ a tune effect mpg, when you are not interducing exhaust back into the motor, via the egr. IDK its open when cruising or light thottle postions.
__________________
Introduce Mr. Torsen to the mixBigger brakes then you- D23 crew- D-Tech- Sedan Revolution= #131
felixthecat is offline  
    Reply With Quote Quick reply to this message
Old 11-29-2012, 12:40 PM   #5
Focus Fanatic
 
Elizabeth's Avatar
 
Join Date: Aug 2011
Fan#: 89280
Location: SouthEast, WI
What I Drive: '14 Tangerine Scream ST3

Posts: 3,424
Points 15,007, Level 79
Points: 15,007, Level: 79 Points: 15,007, Level: 79 Points: 15,007, Level: 79
Level Up 32% Completed
Level up: 32% Level up: 32% Level up: 32%
Forum Activity 4%
Activity: 4% Activity: 4% Activity: 4%
FF Reputation: 16 Elizabeth Great Standing Member
Buy-Sell-Trade Rating: (0)
The EGR valve is not going to affect MPGs at all unless the engine is messed up anyway.
On my former ride, a Contour SVT i made several plates to fully or partially block the EGR.
THey never afected the mpgs in any way, over tens of thousands of miles.
The primary effect of a blocked EGR valve is having some engine slowing power instead of just zero.
(I forgot the right words for this (getting to damn old) but it allows one to use the engine to slow one down if you have a manual tranny)
Otherwise no problems at all. (except if the EGR is totally blocked it will throw a code)
Elizabeth is offline  
    Reply With Quote Quick reply to this message
Old 11-29-2012, 01:47 PM   #6
Focus Enthusiast
 
Join Date: Nov 2011
Fan#: 91777
Location: Belvidere, IL
What I Drive: 2003 Pitch Black ZTS Sedan

Posts: 217
Points 2,131, Level 27
Points: 2,131, Level: 27 Points: 2,131, Level: 27 Points: 2,131, Level: 27
Level Up 88% Completed
Level up: 88% Level up: 88% Level up: 88%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 1 PWGuy Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by Elizabeth View Post
The EGR valve is not going to affect MPGs at all unless the engine is messed up anyway.
On my former ride, a Contour SVT i made several plates to fully or partially block the EGR.
THey never afected the mpgs in any way, over tens of thousands of miles.
The primary effect of a blocked EGR valve is having some engine slowing power instead of just zero.
(I forgot the right words for this (getting to damn old) but it allows one to use the engine to slow one down if you have a manual tranny)
Otherwise no problems at all. (except if the EGR is totally blocked it will throw a code)
Perfect, that's what I needed to know - thanks!

What about the DPFE Sensor that attaches to it?

Thanks again
PWGuy is offline  
    Reply With Quote Quick reply to this message
Reply

Bookmarks & Social Networks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum 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:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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



All times are GMT -5. The time now is 08:17 PM.


Copyright 2002-2015 FocusFanatics.com. All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Mazda CX-3, Audi S3, Mazda MX-5 Miata and Acura TLX. You can find all Ford Focus, Focus ST and Focus RS related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. If you own other makes have a look at Challenger Hellcat Forum, Charger Hellcat Forum, Cadillac ATS-V Forum, Cadillac CTS-V Forum, Lexus RC-F Forum, Lexus GS-F Forum, Mercedes GLA Forum, Mercedes GLE Forum and Volvo XC90 Forum.





Search Engine Optimization by vBSEO 3.6.1