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Lean diagnosis

Discussion in '1st Gen. Tacomas (1995-2004)' started by ghack, Oct 25, 2022.

  1. Oct 25, 2022 at 2:30 AM
    #1
    ghack

    ghack [OP] Member

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    2003 tacoma
    I have an ‘04 2.7 with 240k. I had a p0171, my long term trim was about +22. I found a good sized air leak where the cat pipe bolts to the header, got the manifold bolts cleaned up and corrected that. I also put in a new a/f ratio sensor (Denso 234-9001)and cleaned my MAF sensor, also changed fuel filter. The code went away, but the funny thing is the long term trim didn’t move, and now I get a slight ping under load. I have a scanner that can do primitive graphing. Any suggestions for diagnosis with the scanner or otherwise and/or why the ping would come after the work I did.
     
    Beltal0wda95 likes this.
  2. Oct 25, 2022 at 8:13 AM
    #2
    Andy01DblCabTacoma

    Andy01DblCabTacoma Well-Known Member

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    Andy
    San Diego, CA
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    01 Double Cab v6 4x4 TRD
    F: Kings SPC, R: 5100s+J59s. Custom armor.
    Did you reset the ECU after the work? Either by pulling the EFI fuse, or disconnecting the battery?
     
  3. Oct 25, 2022 at 12:15 PM
    #3
    Beltal0wda95

    Beltal0wda95 Member

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    Mine popped up a month ago. I cleaned the MAF sensor and got a new air filter (it was looking a little gnarly). It ran a bit smoother and I cleared the code. A month later (2 days ago) it popped back up. Now I'm gonna plug my scanner and take a look at my trims.
     
  4. Oct 25, 2022 at 1:06 PM
    #4
    ghack

    ghack [OP] Member

    Joined:
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    Male
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    2003 tacoma
    Thanks for the responses guys. Yeah Andy, I pulled the battery cables off for a while to make sure.
     

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