Running too Lean...P1131, P0171, P0174 - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 06-19-2010
Member
Thread Starter
 
Join Date: Oct 2009
Location: Vandalia, Mo
Posts: 3
Running too Lean...P1131, P0171, P0174

My sons 96 3.0 started running a little rough and a little surging the other day. The codes that came up were P1131, P0171, P0174. I don't know a whole lot about this so any help will be greatly appreciated.
Reply With Quote
  #2  
Old 07-21-2010
TRoyBv6320's Avatar
Member
 
Join Date: Apr 2007
Location: Olathe, KS
Posts: 220
Wow, i just searched this topic and nobody has commented on this thread after a month, I know p0171 and p0174 are bank 1 and 2 running too lean. There should be a guide somewhere on this there internet that lists all the codes if you haven't solved this already. From what I understand, it means there is either a lack of fuel to both banks, or an excess of un-metered air to both banks, aka, a intake/ vacuum leak after the MAF.

I'm not an expert, which is why I'm searching for solutions myself. And I know my '99 4.0 ohv is a lot different than a '96 3.0, but I would assume the codes have remained the same, and that is the information I've gathered.
Reply With Quote
  #3  
Old 07-21-2010
ccosgrove71's Avatar
Member
 
Join Date: Jun 2010
Location: richmond,va
Posts: 185
check your maf, a bad maf can set all of those codes. how many miles?
Reply With Quote
  #4  
Old 08-08-2010
RedRanger91XLT's Avatar
Member
 
Join Date: May 2009
Location: Woodbridge, VA
Posts: 316
i believe Welcome to CanOBD2! has a code searcher you could use. Not sure if that is the correct website.
Reply With Quote
  #5  
Old 08-08-2010
fourliter dan's Avatar
Member
 
Join Date: Dec 2007
Location: Lebanon, OR
Posts: 2,229
171 and 174 are lean codes. willing to bet some were in the system there is un metered air coming through and tricking the o2's to say its lean. check everything that is a vacum line or air line espescially around the intake. another thing i have heard with the 3.0 is that the inake gaskets can crack and cause this code.
Reply With Quote
  #6  
Old 08-09-2010
Fredness's Avatar
Member
 
Join Date: Jul 2006
Location: Sasquatch Country!
Posts: 175
P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1
P0171 lean code for bank 1
P0174 lean code for bank 2

When were the O2's replaced last?
Reply With Quote
  #7  
Old 08-22-2010
Member
 
Join Date: Mar 2010
Location: Noblesville, IN
Posts: 14
I have the same issue right now with my 03. I thought I found it the other night when I saw a cracked hose out of the EGR valve. Not it. Tried the MAF cleaner today. Not it. Can't find a vacuum leak. Original plugs and wires @ 94000 miles.
Reply With Quote
  #8  
Old 08-22-2010
fourliter dan's Avatar
Member
 
Join Date: Dec 2007
Location: Lebanon, OR
Posts: 2,229
Quote:
Originally Posted by Fredness View Post
P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1
P0171 lean code for bank 1
P0174 lean code for bank 2

When were the O2's replaced last?
how likly are both the o2's going to go out at the time....


its more than likckly a vacum/air line cracked
Reply With Quote
  #9  
Old 08-22-2010
Member
 
Join Date: Mar 2010
Location: Noblesville, IN
Posts: 14
I only see the 171 & 174 codes, nothing else. I can't see that many vacuum line on the 3.0 motor.
Reply With Quote
  #10  
Old 08-23-2010
ccosgrove71's Avatar
Member
 
Join Date: Jun 2010
Location: richmond,va
Posts: 185
spray the intake down with carb cleaner, see if the idle raises.
Reply With Quote
  #11  
Old 09-03-2010
Member
 
Join Date: Mar 2010
Location: Noblesville, IN
Posts: 14
Did that no luck. Talked to a mechanic buddy about the hose from the PCV to the intake plenum, the hose looks a little collapsed. He suggested replacing it, but the stinking thing is $53 according to Mr Parts man. The parts suppose to be in tomorrow, so I need to take a look at it.
Reply With Quote
  #12  
Old 09-03-2010
ccosgrove71's Avatar
Member
 
Join Date: Jun 2010
Location: richmond,va
Posts: 185
if its collapsed its most likely that its sucking air from there.
Reply With Quote
  #13  
Old 09-03-2010
Member
 
Join Date: Mar 2010
Location: Noblesville, IN
Posts: 14
$53 for a 3 inch hose is a little pricey, but it appears you don't have much choice. I'm wondering if it comes attached to the pipe that goes into the intake plenum.
Reply With Quote
  #14  
Old 09-03-2010
ccosgrove71's Avatar
Member
 
Join Date: Jun 2010
Location: richmond,va
Posts: 185
i believe the one from ford is redesigned, not sure about the one your getting. the one from ford comes wiht the plastic tube and the elbow.
Reply With Quote
  #15  
Old 09-03-2010
Member
 
Join Date: Mar 2010
Location: Noblesville, IN
Posts: 14
That's what I thought, but the parts guy didn't have a clue. If it does I think I'll have to pull the intake plenum to put it on. Has anyone else replaced this part?
Reply With Quote
  #16  
Old 09-03-2010
ccosgrove71's Avatar
Member
 
Join Date: Jun 2010
Location: richmond,va
Posts: 185
if it were me, just take the elbow off and put it on.
Reply With Quote
  #17  
Old 09-08-2010
Member
 
Join Date: Mar 2010
Location: Noblesville, IN
Posts: 14
The elbow has been re-engineered. It's now a hard plastic piece. It's been replaced, but still have the check engine light.
Reply With Quote
  #18  
Old 09-09-2010
ccosgrove71's Avatar
Member
 
Join Date: Jun 2010
Location: richmond,va
Posts: 185
whats the code? and is it still ruff/surging?
Reply With Quote
  #19  
Old 09-09-2010
Member
 
Join Date: Mar 2010
Location: Noblesville, IN
Posts: 14
Still the 171 & 174, no other code.
Reply With Quote
  #20  
Old 09-09-2010
ccosgrove71's Avatar
Member
 
Join Date: Jun 2010
Location: richmond,va
Posts: 185
have you cleaned the maf?
Reply With Quote
  #21  
Old 09-09-2010
Member
 
Join Date: Mar 2010
Location: Noblesville, IN
Posts: 14
twice
Reply With Quote
  #22  
Old 09-09-2010
ccosgrove71's Avatar
Member
 
Join Date: Jun 2010
Location: richmond,va
Posts: 185
whats the fuel pressure look like?
Reply With Quote
  #23  
Old 09-09-2010
Member
 
Join Date: Mar 2010
Location: Noblesville, IN
Posts: 14
Don't know. Don't have that equipment
Reply With Quote
  #24  
Old 09-09-2010
ccosgrove71's Avatar
Member
 
Join Date: Jun 2010
Location: richmond,va
Posts: 185
take a water hose without the nozzle and run the water all over the engine to be positive no vacuum leaks.
Reply With Quote
  #25  
Old 09-10-2010
Member
 
Join Date: Mar 2010
Location: Noblesville, IN
Posts: 14
I did the either test
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
P1131 with P0171 but not with P0174 JonSimonson 2.9L & 3.0L V6 Tech 0 07-22-2012 07:16 PM
CEL P1131 No Heat, Ind. Lean Hawklore 4.0L OHV & SOHC V6 Tech 2 04-08-2012 10:00 PM
CEL Bank 1 and 2 lean p0171 p0174 HELP PLEASE bryanjints 4.0L OHV & SOHC V6 Tech 21 12-19-2009 12:39 PM
P0174 (system too lean bank 2) Kevin89 2.9L & 3.0L V6 Tech 11 07-31-2009 05:39 PM
P0171 - system too lean rellim_63 SOHC - 2.3L & 2.5L Lima Engines 15 03-17-2008 06:37 AM


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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 10:59 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.