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leak p1131 p1151 lean

  1. I

    p1131 p1151 codes only. Idles fine!

    Hi from Spain. My 97 Explorer SOHC got those two codes but engines idles fine! I guess I got a leak somewhere but can’t find it. Both banks running lean. No other codes stored. Recognized that the egr valve makes noise when rpm increases but holds vacuum perfect! It is defect? On the green line...
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