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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

This topic contains 1 reply, has 2 voices, and was last updated by Nightflyr * Richard Kirshy 7 months, 1 week ago.

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  • #897118
    David Lacroix
    David 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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  • #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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