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EGR and P0171?

Discussion in 'Technical Chat' started by jtra, Nov 5, 2010.

  1. Nov 5, 2010 at 1:48 PM
    #1
    jtra

    jtra [OP] New Member

    Joined:
    Oct 19, 2010
    Member:
    #44933
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    Male
    North Carolina
    Vehicle:
    2000 SR5 V6 4X4
    Ok, I've got a 1st gen with the dreaded P0171 (system too lean) code. I checked for vacuum leaks and found none, then cleaned the MAF sensor 3 times and finally the code didnt return. I'm thinking im a smart son of gun until i opened the hood up later on and realized id left a vacuum hose off when i cleaned the MAF sensor. This is the hose that runs from the air box to the EGR (exhaust gas recirculation) box. After reconnecting the line, the code came back. Any ideas? I know this system only works at high rpms or heavy load so with the truck idling there's no vacuum at all. How do you check it to see if its working properly? Could it be another vacuum leak i just havent found or and oxygen sensor?
     
  2. Nov 5, 2010 at 1:58 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
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    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    Could be a bad MAF. Cmack recently had the same issue, and that what it turned out to be.
     
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