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  1. #1
    Registered Member One Ring
    Join Date
    Sep 13 2007
    AZ Member #
    21057
    Location
    West Palm Beach, FL

    Odd, maxed out fuel trims on 07 Q7 3.6

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    Months ago, with my B5 Passat ageing, I bought a 2007 3.6l Q7 for super cheap off a friend who didn't want to deal with the issues it was developing. So far I have worked through the sun roof leaks, sagging headliner, bad wire to the shifter and trans that was causing a no start issue and many other annoyances.
    What I am having difficulty with now is how rough it is running. Hooking up my new Ross-Tech I get a few codes but none related to the Maf or O2 sensors but when observing blocks 032 and 033 I see the fuel trims seemingly maxed out at 4.5% long term and 25% short term.
    Simply unhooking the Maf gets the short term trims to immediately start cycling above and below 0 which seems condemning of the Maf but within 5 minutes of run time the short term trims are right back to 25% and no change with long term holding at 4.5%.
    If I clear the codes while it it running with the Maf unplugged then again the short term trims cycle around 0 at first and with 5 minutes of run time they again creep to 25% with the long term trim oddly holding at 0%.

    Banging my head here as it seems the O2 sensors are falsely reporting, but both of them? I must not be interpreting the data correctly. Any help is greatly appreciated.
    Zach

  2. #2
    Established Member Two Rings
    Join Date
    Jun 15 2017
    AZ Member #
    401161
    Location
    Wisconsin

    Not sure if itíll help but over on the RS4 forum thereís a very long and detailed thread about how bad or worn injectors can be indicated by high fuel trims. Might be worth a look.
    2007 Phantom Black RS4. Stasis ÷hlins MS, Euro FBSW, Hotchkis ARB, MkII RNSe.
    2013 Daytona Grey Q7 S-Line Prestige.

  3. #3
    Registered Member One Ring
    Join Date
    Sep 13 2007
    AZ Member #
    21057
    Location
    West Palm Beach, FL

    Thanks Kenny, I'll check it out.



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