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Thread: O2 sensor + Headers ?'s

  1. #1
    Lifetime Member samh_08's Avatar
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    Default O2 sensor + Headers ?'s

    Hey guys Im pretty new here. I've been reading into o2 sensor switching points being affected by having long tube headers. I was wondering if for 1.) I am even asking a 'sane' question and for 2.) What kind of condition would this cause? (false rich or lean condtion)

    Please help me out, Thanks!

  2. #2
    Lifetime Member mr.prick's Avatar
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    1. There's nothing wrong with your question,
    the O2's switching makes a difference on AFR.

    2. I increased the values in the idle areas to richen the idle
    and decreased the WOT areas to lean out a bit of over fueling.
    I ended up with a flatline of 500.00

    Keep in mind my LTFT's are -5% and my MAF has been rescaled.
    Last edited by mr.prick; March 23rd, 2009 at 03:24 PM.
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  3. #3
    Lifetime Member samh_08's Avatar
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    Well I just swapped an 05 LQ4 into a 86 monte. I never knew what stock trims were and went straight to head/cam long tubes. It now shows that im -18% LTFT pretty much anywhere. I was just wondering if my o2 sensors location where giving me a false reading.

    Any input in appreciated, thanks.

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