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97 K2500 codes?

Discussion in 'Chevy Trucks' started by EricD701, Oct 26, 2011.

  1. EricD701

    EricD701 Senior Member
    Messages: 150

    Hi I have a 1997 K2500 5.7 I am getting the following codes

    P0171 system to lean bank 1

    P0174 system to lean bank 2

    P0175 system to rich bank 2
  2. mike54017

    mike54017 Junior Member
    Messages: 1

    Bad o2

    Possible bad o2 sensor or an intake leak.
    Maybe bad cat convertor

  3. EricD701

    EricD701 Senior Member
    Messages: 150

    Thanks Mike

    I replaced the rear O2 censor last year, I did notice I have a couple of cracks in my exhaust manifold. Do you think this would cause the codes that I'm seeing?
  4. sweetk30

    sweetk30 PlowSite.com Addict
    Messages: 1,588

    belive it or not but cracks in exaust manifolds will suck air and mess up o2 reading .

    good place to start is replace the bad manifolds and recheck for leaks again.

    also soak the egr tube nuts real good with pb blaster for a few days to help get that sucker loose. and go slow and dont force it if it snaps its new tube time. = payup
  5. EricD701

    EricD701 Senior Member
    Messages: 150

    Thanks I will give that a shot.

    Not looking forward to the egr tube hope I get lucky and it doesn’t snap.
  6. lilweeds

    lilweeds PlowSite.com Addict
    Messages: 1,178

    Clean you MAF sensor on the intake. If it gets dirty it can set those codes.
  7. 06Sierra

    06Sierra PlowSite.com Addict
    from Maine
    Messages: 1,329

    Get some SeaFoam deep creep. I have never seen anything like it for rusted bolts.