P0171 System Too Lean (Bank 1) - Page 2
+ Reply to Thread
Page 2 of 2 FirstFirst 12
Results 16 to 18 of 18

This is a discussion on P0171 System Too Lean (Bank 1) within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Thats how they both work (MAF & MAP) in closed loop. Openloop does not use O2 sensor feedback. You might ...

  1. #16
    Moderator Donkey's Avatar
    Join Date
    Apr 2005
    Location
    Da boonies
    Posts
    6,318
    I Support ClubWRX
    Thats how they both work (MAF & MAP) in closed loop. Openloop does not use O2 sensor feedback. You might want to think about taking this car to a professional.............
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S




  2. Remove Advertisements
    ClubWRX.net
    Advertisements
     

  3. #17
    Registered User BrandonPaquette's Avatar
    Join Date
    Dec 2009
    Location
    Sudbury, Canada
    Posts
    93
    So map is closed loop?
    Brandon Paquette

  4. #18
    Moderator Donkey's Avatar
    Join Date
    Apr 2005
    Location
    Da boonies
    Posts
    6,318
    I Support ClubWRX
    Quote Originally Posted by BrandonPaquette View Post
    So map is closed loop?
    No..........both MAF and MAP use both closed and openloop fueling. At idle and part throttle you are in closed loop for best fuel economy and emissions. At W.O.T. you go into Openloop fueling. Difference with the Subaru is the ECU now thinks your MAF is broken and now is using the "limp" mapping for fueling and timing. You are technically in a lower state of tune when defauled to the MAP sensor. Google might help explain more about OP/CL fueling.........
    Last edited by Donkey; 02-03-2010 at 09:10 AM.
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S




+ Reply to Thread
Page 2 of 2 FirstFirst 12

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself. We strongly suggest that you stay away from using aol, yahoo, msn, and hotmail accounts. Sometimes the mail server blocks the emails from our server. As a result you will not receive any notifications including the confirmation email.

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.


Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •