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lean condition

  1. Fuel Trim Experts Welcome

    Powertrain & Driveline
    In my limited knowledge of fuel trims (still learning), I've been trying to find what is causing a reoccurring lean condition P0171 on my '11 Xterra. It is a weird one for a couple of reasons: 1. First code threw, I cleared it, then it came back 2 months and 1500 miles later 2. LTFT/STFT on both...
  2. Can Cooling issues Cause a Lean Condition?

    Powertrain & Driveline
    2011 xterra with 140k on 'er. I noticed heating issues with the HVAC system (blowing cold when idle) and that the engine was running a warmer than usual, especially during a long drive (~4 hours each way) over the weekend. It wasn't close to overheating or anything, just a bit hotter than usual...