Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 2007 - 2014 Expedition & Navigator
Sign in using an external account
Register Forgot Password?


2007 - 2014 Expedition & Navigator 2007, 2008, 2009, 2010, 2011, 2012, 2013 and 2014 Ford Expedition and Lincoln Navigator

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 10-22-2012, 02:41 PM
jhfishdad jhfishdad is offline
New User
 
Join Date: Oct 2012
Posts: 2
jhfishdad is starting off with a positive reputation.
facebook.com/jhfishdad
Expedition towing power loss, no codes

Have a 2003 XLT 4.6L Expedition (160,000mi) that has been awesome, but recently began loosing power at speeds over 45mph (rpms >3000) when towing boat up hill in GA (overdrive off). Runs & shifts smooth w/ no miss fires. Large EGR vacuum line blows off when I floor the gas, but no codes to go by. Researched most forums and can't find answers. I hope you can help.

Here are my readings at idle (and with ACTRON scanner):
EGR line pressure ~ 2PSI (this seems normal back pressure at idle)
idle vacuum test 19psi, increases with higher rpms (no vacuum leaks).
Oxygen Bank 1: 02S11 0.4V, 02S12 0.8V
Oxygen Bank 2: 02S21 0.3V, 02S22 0.7
MAF flow 4.6, Coolant temp: 179 F,
FUEL system 1 closed loop: ST FTRM 3.9%, LTFTRM 7.8%

I ordered an ELMSCAN 5 OBD reader to test engine more before replacing catalytic converters.

Q1) I suspected catalytic converter after it gets hot but how do I test it, what should I look for? When cool the back pressure appears normal.

Q2) How do I find out factory specs on oxygen sensors? they seem ok.

Q3) Does the 2003 Expy have baby cat-convertors or normal ones? I heard baby cats send different signals to computer than normal ones (can't find factory specs).
Reply With Quote
  #2  
Old 01-02-2014, 05:44 PM
Morgueman Morgueman is offline
New User
 
Join Date: Jan 2014
Posts: 8
Morgueman is starting off with a positive reputation.
Did you ever figure your issue out? I have the same problem with power loss when pulling my boat up boat launch ramps. Thanks!
Reply With Quote
  #3  
Old 01-03-2014, 08:49 AM
heymrdj's Avatar
heymrdj heymrdj is offline
Elder User
 
Join Date: Aug 2007
Location: Churubusco, IN
Posts: 831
heymrdj is gaining momentum as a positive member of FTE.heymrdj is gaining momentum as a positive member of FTE.
heymrdjlive
This sounds like a failing cat to me, typically whenever you blow that hose it's a backpressure problem (or a failed egr). 2PSI seems high to me for an idle line pressure, you want to be closer to 1 if I remember correctly, at least under 1.5psi. 2 For most vehicles indicates restriction.

OEM (and OEM like replacements from companies like magnaflow) are dual section and mount both oxygen sensors. I highly recommend these units to the universal ones. But it's also more expensive. A universal is like 250$ per side, the OEM like one is about 700$.
__________________
Current: 2014 Ford Fiesta SE Green Envy
Past:
RIP 2004 Expedition - The Real LNDBARJ 2007-2014
Reply With Quote
  #4  
Old 01-03-2014, 10:00 AM
Morgueman Morgueman is offline
New User
 
Join Date: Jan 2014
Posts: 8
Morgueman is starting off with a positive reputation.
Quote:
Originally Posted by heymrdj View Post
This sounds like a failing cat to me, typically whenever you blow that hose it's a backpressure problem (or a failed egr). 2PSI seems high to me for an idle line pressure, you want to be closer to 1 if I remember correctly, at least under 1.5psi. 2 For most vehicles indicates restriction.

OEM (and OEM like replacements from companies like magnaflow) are dual section and mount both oxygen sensors. I highly recommend these units to the universal ones. But it's also more expensive. A universal is like 250$ per side, the OEM like one is about 700$.
Thanks for the suggestion. Wouldn't a failing cat have reduced power, but not complete power loss? I'm having complete power loss, and then full power suddenly returns after a bunch (maybe 5 or 8) attempts to get back up the launch ramp.
Reply With Quote
  #5  
Old 01-03-2014, 10:07 AM
heymrdj's Avatar
heymrdj heymrdj is offline
Elder User
 
Join Date: Aug 2007
Location: Churubusco, IN
Posts: 831
heymrdj is gaining momentum as a positive member of FTE.heymrdj is gaining momentum as a positive member of FTE.
heymrdjlive
Quote:
Originally Posted by Morgueman View Post
Thanks for the suggestion. Wouldn't a failing cat have reduced power, but not complete power loss? I'm having complete power loss, and then full power suddenly returns after a bunch (maybe 5 or 8) attempts to get back up the launch ramp.
Full power loss is indicative of a plugged cat, normally a cat where the honeycomb has broken apart inside a formed a plug due to the high temps. You may be getting power by melting the plug slightly with the high revs. Normally by that point though you'll throw error codes. Have you had the engine scanned?
__________________
Current: 2014 Ford Fiesta SE Green Envy
Past:
RIP 2004 Expedition - The Real LNDBARJ 2007-2014
Reply With Quote
  #6  
Old 01-03-2014, 10:30 AM
Morgueman Morgueman is offline
New User
 
Join Date: Jan 2014
Posts: 8
Morgueman is starting off with a positive reputation.
I think I may have a different issue than the original poster. My Navigator will pull the boat up the launch ramp a few feet, and then I have complete loss of power. No revving of the engine...it just idles normally while I'm pressing the gas (and taking my foot off the "everyday" brake. Finally, after a number of attempts (maybe 5 or 7 of them), it'll successfully pull the boat up the ramp. I've had the vehicle at the Forder dealership and no codes are showing.
Reply With Quote
  #7  
Old 01-03-2014, 10:36 AM
heymrdj's Avatar
heymrdj heymrdj is offline
Elder User
 
Join Date: Aug 2007
Location: Churubusco, IN
Posts: 831
heymrdj is gaining momentum as a positive member of FTE.heymrdj is gaining momentum as a positive member of FTE.
heymrdjlive
To me that sounds like a bad accelerator pedal assembly. The throttle is electronic, so if the switch is going faulty it will register intermittent moments on the accelerator. Here' info from another section of the forums, I don't know if the 08 uses the same IVS setup though. One user mentions same as you, having to "pump" the go pedal before finally it works.

http://www.ford-trucks.com/forums/93...ce-w-pics.html
__________________
Current: 2014 Ford Fiesta SE Green Envy
Past:
RIP 2004 Expedition - The Real LNDBARJ 2007-2014
Reply With Quote
Old 01-03-2014, 10:36 AM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
2004 Lincoln Navigator - 5.4 Intech - P2197 O2 Sensor Signal Biased/Stuck Lean (Bank 2 Sensor 1) Kid Clean Expedition & Navigator 4 09-08-2014 03:52 PM
P0171/P0174 - not the easy stuff pounder90 1997 - 2003 F150 37 04-16-2014 08:12 PM
2003 f-150 4.6l high idle at startup herb76 1997 - 2003 F150 2 03-31-2013 09:52 AM
NO POWER after engine & transmission rebuild truckin101 Computer Chips & Tuners 4 06-23-2010 05:21 PM
97 2.3L loping idle - longish sinned Ranger & B-Series 4 08-15-2006 08:24 PM


Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 2007 - 2014 Expedition & Navigator

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 03:49 PM.


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