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Long Term Fuel Trim related to vacuum leak

Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Long Term Fuel Trim related to vacuum leak

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  • February 11, 2020 at 11:06 pm #897118
    David LacroixDavid Lacroix
    Participant

      Hi,

      I understood that the LTFT will go down gradually if you increase RPMs. This would be an indicator of a vacuum leak. I’ve been looking for vacuum leak on my car recently, the LTFT are at 32% at idle but when a give it 2000-3000 RPMs it will instantly go down to -3%. Any idea why?

      Thanks

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    • February 12, 2020 at 12:44 pm #897243
      Nightflyr *Richard Kirshy
      Participant

        If you believe your dealing with a vacuum leak.
        There are several methods to try to pin point the source.
        Water spray
        Propane
        Smoke test

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