Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 1997 - 2003 F150
Sign in using an external account
Register Forgot Password?


1997 - 2003 F150 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage SPONSORED BY:

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 04-11-2009, 08:56 PM
scott4401 scott4401 is offline
New User
 
Join Date: Apr 2009
Posts: 3
scott4401 is starting off with a positive reputation.
P0402 Exhaust Gas Recirculation Flow Excessive Detected

Hello, I have a F150 4.6 liter with 85000 miles on it and I keep getting the Code P0402 Exhaust Gas Recirculation Flow Excessive Detected. I have changed the DPFE sensor and the EGR Valve and the EGR Vacuum Solenoid. Basically everything in the chain of the Vacuum lines. I cant seem to get this code to go away and I think it is affecting my gas milage to. Any help on where to go next would be appreciated. Thanks
Reply With Quote
  #2  
Old 04-11-2009, 10:34 PM
dadlovesfords's Avatar
dadlovesfords dadlovesfords is offline
Senior User
 
Join Date: Feb 2008
Location: Colorado
Posts: 199
dadlovesfords is starting off with a positive reputation.
Did you remove or replace the filter at the EGR valve. Easiest is to just remove it , and clean housing out with throttle body cleaner.
__________________
2000 F150 XLT Super Cab 4x4 5.4L Auto 151,000mi
2002 Expedition XLT 4x4 5.4L Auto 101,000mi
1982 Mustang GT w/T-Tops 5.0L 4bbl 4spd 68,000mi
Reply With Quote
  #3  
Old 04-12-2009, 12:44 AM
Bluegrass 7 Bluegrass 7 is offline
Post Fiend
 
Join Date: Sep 2006
Posts: 5,040
Bluegrass 7 has a good reputation on FTE.Bluegrass 7 has a good reputation on FTE.
Here is an example of knowing what the 402 test is doing.
Basicly the PCM looks at the DPFE with the EGR closed such that no flow is supposed to occurr.
How it detects this is the DPFE sees the same exhaust pressure on both sides of the calibrated orfice indicating there is no flow or 'pressure drop' accross the orfice.
If there is a leak in the pipeing off the exhaust manifold, any hoses are leaking that connect the DPFE to the test tubes or a leaking EGR, the DPFE will not signal the pressure is the same on both it's ports. (sort of like a 401 test when it is not the expected results of the test)
This test is done at cold startup-drive-away to use the extra exhaust pressure of the motor as it is increasing in rpm.
Inspect closely the metal tube at the exhaust for cracks, rust holes as well as the DPFE hoses and small connecting tubes for a problem.
Test the operation of the EGR to be sure it is seating closed.
Test that the vacuum control that operates the EGR is allowing the EGR to close because it is a 3 port device that must let air into the EGR once it has been opened so it will close again and not hang up.
Good luck.
Reply With Quote
  #4  
Old 04-12-2009, 07:45 AM
projectSHO89 projectSHO89 is offline
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 9,374
projectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud of
...and make certain that your new DPFE sensor came from Motorcraft, not an aftermarket supplier.
__________________
2001 F250 SD V10 4x4
HVAC FAQs: http://www.ford-trucks.com/forums/75...xpedition.html
Owner's manuals: http://www.fleet.ford.com/maintenance/owner-manuals/
It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.” - Mark Twain
Reply With Quote
  #5  
Old 04-13-2009, 12:22 PM
scott4401 scott4401 is offline
New User
 
Join Date: Apr 2009
Posts: 3
scott4401 is starting off with a positive reputation.
Why does it matter if you put a mororcraft part on it I believe the one from Rock Auto was a AC Delco.
Reply With Quote
  #6  
Old 04-13-2009, 12:24 PM
scott4401 scott4401 is offline
New User
 
Join Date: Apr 2009
Posts: 3
scott4401 is starting off with a positive reputation.
Quote:
Originally Posted by dadlovesfords View Post
Did you remove or replace the filter at the EGR valve. Easiest is to just remove it , and clean housing out with throttle body cleaner.
Do you mean to just remove the EGR Valve and then retrieve the filter or do I have to remove the entire throttle body?
Reply With Quote
Old 04-13-2009, 12:24 PM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
P0402 code bbsitum 1997 - 2003 F150 6 03-29-2012 08:02 PM
code P0402 excessive exhaust flow? wildstang Explorer, Sport Trac, Mountaineer & Aviator 11 09-03-2008 10:36 PM
Codes finally read....P0402 Ricohman Modular V10 (6.8l) 3 04-19-2007 10:16 AM
Code Talk blieux1 1997 - 2003 F150 4 02-24-2007 09:55 AM
Trouble code P0402 tomf52 Ranger & B-Series 3 06-13-2004 10:34 PM


Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 1997 - 2003 F150

Tags
2000f150, 2003, 54l, code, codes, detected, egr, excessive, exhaust, f250, flow, ford, gas, p0402, p0402exhaust, po402, recirculation

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »





All times are GMT -5. The time now is 08:03 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup