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Lean looking spark plugs

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  • November 4, 2016 at 3:44 pm #871514
    stevesteve
    Participant

      Hi, The spark plugs have appearance of lean look. ST,LT fuel trims are within range. ST trims are close to 0. Could there still be some issues, like vaccum leak, thats not picked up by the fuel trim readings? car has difficulty in climbing anything not flat road.

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    • November 4, 2016 at 8:07 pm #871530
      college mancollege man
      Moderator

        Could you post what the plugs look like? If you had a vacuum leak fuel trims would climb.

        November 5, 2016 at 1:04 pm #871568
        James P GrossoJames P Grosso
        Participant

          [quote=”college man” post=178901]Could you post what the plugs look like? If you had a vacuum leak fuel trims would climb.[/quote]

          Yes, post photos. also, how are you reading the spark plugs to determine they are lean? Are these the correct heat range spark plugs for the engine?

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