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  1. #1
    Join Date
    Jul 2009
    Posts
    532

    WOT Fuel

    Do they come lean from the factory or rich? I've got my 02's reading 860-880mV. I just leaned it out on the top side a little compared to stock on the stoich afr WOT divider. Truck is stock with grandpa exhaust and k&n drop in. Some serious mods
    04 Silverado Z-71 Extended Cab

    Magnaflow, 10.4 TV 50 wires, tr-55ix, Synthetics, HID's, JL audio, 33.5", leveling kit, tuned, CAI, vette servo, cam, valve job, pacesetter. 9.3@77.5 and 14.5@93.4

    06 2wd

    custom cam, tune, 3.73's, servo, HID's, 10.4mm wires, long-tubes, CAI, magnaflow, 2.5" shackles, Circle-D 3200, UD, JL Audio 4.1, Alpine 5ch

  2. #2
    Join Date
    Aug 2007
    Location
    Honeywood, Ontario
    Posts
    6,994
    Mine tried to maintain stoich until it hit PE, then it went to about 11.5:1.
    2006 Silverado
    Little Black Bitch

  3. #3
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,038
    They run lean until PE comes in, which is way too late but doesn't hurt anything m
    Then the engine runs rich when cot comes in.

    Adjust PE mode and turn off cot.

    Those o2 sensor readings sound just right. If they're working correctly they can give u a very good idea on afr

  4. #4
    Join Date
    Nov 2007
    Location
    Pittsburgh, PA
    Posts
    3,581
    All stated is correct. My crewcab read 11.8 from factory just leaning it out it picked up rpm band and smoother power

  5. #5
    Join Date
    Jul 2009
    Posts
    532
    Yea i've got PE settings good to go. I leaned it out very little from 4k up and could tell a difference in power and engine sound. The IDC got to about 68% then just about flat lined the last 2k rpm's. I'll have to borrow a wb from someone.
    04 Silverado Z-71 Extended Cab

    Magnaflow, 10.4 TV 50 wires, tr-55ix, Synthetics, HID's, JL audio, 33.5", leveling kit, tuned, CAI, vette servo, cam, valve job, pacesetter. 9.3@77.5 and 14.5@93.4

    06 2wd

    custom cam, tune, 3.73's, servo, HID's, 10.4mm wires, long-tubes, CAI, magnaflow, 2.5" shackles, Circle-D 3200, UD, JL Audio 4.1, Alpine 5ch

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