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Engine stuttering at Idle

This is a discussion on Engine stuttering at Idle within the General Help forums, part of the LSx Technical Help Section category; I plugged them back in, am i correct in assuming that because the issue disappears when i unplug my o2's ...

  1. #21
    Member mike171562's Avatar
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    I plugged them back in, am i correct in assuming that because the issue disappears when i unplug my o2's then the o2's are bad?

  2. #22
    Junior Member seth_12's Avatar
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    You need the front o2 sensor in, it makes your air fuel ratio go whack. You could change them both and see if it helps, just changed both of mine man. I spent $140 on two, there freaking expensive $70 a piece.

  3. #23
    Member mike171562's Avatar
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    can somebody chime in here, if my o2's were disconnected and the problem disappears, does that mean the o2's are bad? It seems to be getting worse and I drive this car to work and back 60 miles everyday.

    I recorded some OBD Data on my way to work today, my LTFT are in the really low negatives

    o2 sensor 2


    o2 sensor 2-2


    o2 sensor 2-1


    o2 sensor 1


    Long term fuel trim 2


    Long term fuel trim 1
    Last edited by mike171562; 03-30-2010 at 06:47 AM.

  4. #24
    Moderator Cutlass's Avatar
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    2001 Silverado Z71

    The O2s look like they are switching rich to lean ok. Bank 1 sensor 1 is slightly skewed to the lean side compared to the other one. The fuel trims on both banks are pretty consistant with each other again with Bank 1 slightly skewed more negative. negative fuel trims means the computer is trying to lean out the engine because it thinks it running rich.

    With the O2s switching ok, I'm not convinced its the O2s. It could be but...not completely convinced.
    With the O2s unplugged, the engine stays in open loop and doesn't adjust the fuel trims. I think the adjusted fuel trims might be part of your problem. Maybe the MAF isn't reading correctly.

  5. #25
    Member mike171562's Avatar
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    Thanks for the reply, when i got my tune almost a month ago, my tuner told me it was running lean and my MAF was dirty so I cleaned my MAF with some CRC. Today i got two codes p0132 and p0135, its running rich on both banks, could this be my o2's? would they both go bad at the same time? I dont want to waste money buying new ones if its not necessary, I reset the codes and drove around my LTFT's are still around -12

  6. #26
    Junior Member seth_12's Avatar
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    I don't think its you o2...you can't always go by what the sanner say and most of them useally go for the first thing which is a o2 sensor....look into to the issue some more.

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