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  1. #1

    Default Bank 1 Running Lean

    I am new to this forum. I have a 2001 Suburban with a 5.3 liter with more than 200,000 miles but truck still running ok. The check engine light came on and had a code of P0171 for lean bank 1 engine also a little sluggish. I cleaned the MAF sensor and it did not help. Ran a compression check to see how far gone the engine was and had readings between 190 and 210 Except in to cylinders on bank 1 that were about 20 psi below the average. I pulled the heads and found that cylinders 1,3,2-8 had normal looking wear with carbon build-up and 5,7 looked like they had been steam cleaned or something so I am trying to find out what whould cause the difference in the cylinder appearence. I am not sure that water is actually getting into the cylinders or not. I haven't noticed and steam like exhaust
    Attached Thumbnails Attached Thumbnails Les 224.jpg   Les 222.jpg   Les 220.jpg   Les 223.jpg  

  2. #2


    Check this document out,
    You did not mention coolant loss, but I would still check and see if you have this brand head.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

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