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


Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator SPONSORED BY:

Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 07-11-2003, 06:04 PM
Houndog101 Houndog101 is offline
Junior User
 
Join Date: Jul 2003
Location: Fallston
Posts: 68
Houndog101 is starting off with a positive reputation.
OBD code 171, 174

The wife's Expy,, developed rough idle, then check engine light..Pulled codes 171, 174..Can anyone help??

Thanks Ted

Last edited by Houndog101; 07-11-2003 at 06:46 PM.
Reply With Quote
  #2  
Old 07-11-2003, 08:25 PM
Rtpjunior Rtpjunior is offline
Senior User
 
Join Date: Feb 2003
Location: Bronx, New York
Posts: 369
Rtpjunior is starting off with a positive reputation.
OBD code 171, 174

Code 171 and 174 are for bank 1 and 2 running too lean. The engine has compensated as rich as it can go, and it is still to lean. This does not necessarily mean your mixture is bad, but something (a sensor) is telling the ECM to correct lean. The oxygen sensors alert the ECM to how lean/rich the exhaust is, and then the ECM trips a code. Maybe you have a bad oxy. sensor, but since there are 4 of them (2 per bank), I don't think they could all go at once.
__________________
97 4x4 E.B. 5.4
Flowmaster Force II
75mm Throttle Body
Cold Air Intake
O.Z. Nova Wheels
Kumho Ecsta STX 285/60 18
APC Projector Lights
B&M Shift Kit
Viper Responder 790 XV
Superchips Microtuner
Reply With Quote
  #3  
Old 07-11-2003, 08:44 PM
fte fte is offline
New User
 
Join Date: Jul 2003
Location: fresno usa
Posts: 1
fte is starting off with a positive reputation.
OBD code 171, 174

I had the same codes come up and it wasn't the sensor but it was the hose from the pvc valve to the intake system. It had small pin hose that was letting air into the system as was making my truck idle bad. Feel around to the back of the hose behind the air intake.
Reply With Quote
  #4  
Old 07-11-2003, 08:48 PM
Rtpjunior Rtpjunior is offline
Senior User
 
Join Date: Feb 2003
Location: Bronx, New York
Posts: 369
Rtpjunior is starting off with a positive reputation.
OBD code 171, 174

Quote:
Originally posted by fte
I had the same codes come up and it wasn't the sensor but it was the hose from the pvc valve to the intake system. It had small pin hose that was letting air into the system as was making my truck idle bad. Feel around to the back of the hose behind the air intake.
FTE is right, I forgot about that. I had the same engine issues, but not as bad. My PCV hose looked like it had been in the microwave for 20-30 minutes and barely allowed any air through it.
__________________
97 4x4 E.B. 5.4
Flowmaster Force II
75mm Throttle Body
Cold Air Intake
O.Z. Nova Wheels
Kumho Ecsta STX 285/60 18
APC Projector Lights
B&M Shift Kit
Viper Responder 790 XV
Superchips Microtuner
Reply With Quote
  #5  
Old 07-12-2003, 06:44 AM
Houndog101 Houndog101 is offline
Junior User
 
Join Date: Jul 2003
Location: Fallston
Posts: 68
Houndog101 is starting off with a positive reputation.
OBD code 171, 174

Thanks Guy's for the quick response..I'll check that out this AM..
__________________
2000 Black Lightning
98 Pace Arrow Vision motorhome, 37', F53, V10.
98 Eddie Baur Expedition
http://www.ford-trucks.com/forums/cu...ar202008_2.gif

Last edited by Houndog101; 07-12-2003 at 06:58 AM.
Reply With Quote
  #6  
Old 07-14-2003, 07:58 AM
Houndog101 Houndog101 is offline
Junior User
 
Join Date: Jul 2003
Location: Fallston
Posts: 68
Houndog101 is starting off with a positive reputation.
Unhappy OBD code 171, 174

Can not find any leaks in the intake system,,any other ideas ?
Thanks..
__________________
2000 Black Lightning
98 Pace Arrow Vision motorhome, 37', F53, V10.
98 Eddie Baur Expedition
http://www.ford-trucks.com/forums/cu...ar202008_2.gif
Reply With Quote
  #7  
Old 07-14-2003, 03:51 PM
RADVRA RADVRA is offline
New User
 
Join Date: Jul 2003
Location: Maryland
Posts: 20
RADVRA is starting off with a positive reputation.
OBD code 171, 174

This appears to be a common problem!...I also have a 1998 Expedition EB 5.4L Triton (77k miles), and have a rough idle and "check engine" light warning. I just wanted to thank you all for this forum and great ideas that are shared. I am headed to Autozone this afternoon to see if I can get a code check to determine if I need to replace O2 sensors MAS, or a PVC valve (haven't inspected this yet).

The thought of taking my truck to a dealer and paying through the nose to fix this problem lead me here (that and the realization that I was looking at 4 O2 sensors to troubleshoot!). I appreciate the info that you all provide!

Question: Are the O2 sensors hard to get at/replace?
Reply With Quote
  #8  
Old 07-14-2003, 04:51 PM
Rtpjunior Rtpjunior is offline
Senior User
 
Join Date: Feb 2003
Location: Bronx, New York
Posts: 369
Rtpjunior is starting off with a positive reputation.
OBD code 171, 174

Quote:
Originally posted by Houndog101
Can not find any leaks in the intake system,,any other ideas ?
Thanks..
The PCV may look OK, but you have to trace the tubing back around to the back of the motor. It connects to the intake manifold with a small rubber elbow. This elbow, over time deteriorates from the heat inside the engine compartment. If you gently squeeze the elbow, you will feel the damage to it, it's probably cracked. It is almost impssoble to visually inspect due to its location. Check this out before going further, it may save you some $$$.
__________________
97 4x4 E.B. 5.4
Flowmaster Force II
75mm Throttle Body
Cold Air Intake
O.Z. Nova Wheels
Kumho Ecsta STX 285/60 18
APC Projector Lights
B&M Shift Kit
Viper Responder 790 XV
Superchips Microtuner
Reply With Quote
  #9  
Old 07-15-2003, 07:09 AM
Houndog101 Houndog101 is offline
Junior User
 
Join Date: Jul 2003
Location: Fallston
Posts: 68
Houndog101 is starting off with a positive reputation.
OBD code 171, 174

Thanks Rpt,,I'll check it tonight..
__________________
2000 Black Lightning
98 Pace Arrow Vision motorhome, 37', F53, V10.
98 Eddie Baur Expedition
http://www.ford-trucks.com/forums/cu...ar202008_2.gif
Reply With Quote
  #10  
Old 07-16-2003, 04:53 PM
Houndog101 Houndog101 is offline
Junior User
 
Join Date: Jul 2003
Location: Fallston
Posts: 68
Houndog101 is starting off with a positive reputation.
Talking OBD code 171, 174

Replaced the PCV assembly and hoses,,That fixed the problem..Thanks Again for the help..
__________________
2000 Black Lightning
98 Pace Arrow Vision motorhome, 37', F53, V10.
98 Eddie Baur Expedition
http://www.ford-trucks.com/forums/cu...ar202008_2.gif
Reply With Quote
  #11  
Old 08-26-2003, 01:28 AM
worshiper worshiper is offline
New User
 
Join Date: Aug 2003
Posts: 5
worshiper is starting off with a positive reputation.
Lightbulb OBD code 171, 174

Thanks for the thread guy's. My 97 E350 check engine light came on 2 weeks ago. After replacing 2 O2's I looked here and found my PVC elbow was bad (it did look like it had been in a microwave)

Autozone's OBD said it was too lean, but no code. O'Riley's machine give me a code of 171,174. That's how I found this thread. If I looked here first, I might have saved $100.00 bucks.
Reply With Quote
Old 08-26-2003, 01:28 AM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
99 f150 trouble codes 171,174, and 455 69ford99 1997 - 2003 F150 1 08-16-2013 01:18 AM
Check engine light (Codes 171 & 174) J H Explorer, Sport Trac, Mountaineer & Aviator 6 12-07-2008 08:12 PM
check engine code 171 and 174 1997 ranger 97 ranger 1 Ranger & B-Series 7 06-26-2005 08:04 PM
1998 F150 Triton V8 Fault Codes Lastwrench 1997 - 2003 F150 2 06-10-2005 01:22 AM
PO 171 and PO 174 DTC Codes PLatreille Expedition & Navigator 9 02-13-2005 02:11 PM


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

Tags
04, 171, 171174, 174, 1997, 54triton, code, code171, codes, expedition, ford, lincoln, navigator, ob2, obd

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



All times are GMT -5. The time now is 05:08 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. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup