02 sensor problem during vtuning need help

Discussion in 'Electrical' started by jpbo, Nov 11, 2015.

  1. jpbo

    jpbo New Member

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    Good day
    the bike a 2008 road king 45,00 kms start wiggle between 1900 to 2100 rpm while i was doing the third vtune run, i look to the vtune data and see the rear 02 sensor at theses rpm stick around 160mv and the rear injector bpw also very low compared to the front ,while the front works normally, also there is big backfire at these rpm in deceleration, i replaced the rear oxygen sensor with no change, i checked for air leak all seems good, before replacing something else i'd need advices, i don't have the breakout box, hope it's not the ECM
    at others rpm idle and cruising speed the bike run normally,
    i attached zip master tune data

    is that happened to someone?
     

    Attached Files:

  2. Jack Klarich

    Jack Klarich Expert Member

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  3. jpbo

    jpbo New Member

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    sorry , i forgotten , i get the dtc code p0151

    thanks
     
  4. Jack Klarich

    Jack Klarich Expert Member

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    That is a rear O2 sensor reading lean, not enough fuel or a leak in the rear intake
    Have you tried the wiggle test on the injector wire? Some times the wire is TOO shrt an you lose the connection@the injector
     
  5. jpbo

    jpbo New Member

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    i have checked leak in the rear i saw nothing
    when i recorded with datamaster and look the data i saw the front sensor and injector doing good
    thanks