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Thread: Time for Oxygen Sensor Replacement.

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  1. 05-12-2009 01:28 PM #1
    BINNCZ71
    BINNCZ71 is offline Member
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    Time for Oxygen Sensor Replacement.

    I did a quick search, saw different results. My truck has 108,000 hard miles.
    The cats were replaced at 65,000 miles by the dealer. However the oxygen sensors are original .

    My truck is a 1999 Silverado Z-71 5.3, Auto with basic mods. Cold AIr intake, exhaust, 02 computer, 02 injectors, and Finish Line Level 5 tranny.
    Tuning by allen nelson, but before he started, it ran a year or so with hypertech.

    My mileage has dropped, plugs look great. Wires are good.

    What oxygen sensor is everyone using, and do I need to replace all of them ?

    Thanks,

    Brian
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  2. 05-12-2009 10:18 PM #2
    GasGuzzler's Avatar
    GasGuzzler
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    Check the FPR for leaks from the vacuum port. Clean the MAF too.
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  3. 05-12-2009 11:42 PM #3
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    yellowdemon327
    yellowdemon327 is offline Senior Member
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    Im havin the same issues, what are good o2 sensors to use. i only need 2 of them. rears are turned off.
    02' silverado ext. cb 2wd , 5.3 liter 325c.i. LM7, ported and polished throttlebody with bypass, Jannetty Racing 87 octane dyno tune, cold air intake with custom ram air, Heavy duty built 4l60e with vette servo, Z-pac clutches, "The Beast" Sunshell, transgo shift kit, yukon 4.10 gears with true trac, custom exhaust with Moroso Spiralflow, no cats, MSD 8.5 race wires, NGK TR55's
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  4. 05-13-2009 09:35 AM #4
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    DamnYankee
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    Stock...get them from the dealer.
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  5. 05-13-2009 09:40 AM #5
    Melissa@NelsonPerformance's Avatar
    Melissa@NelsonPerformance
    Melissa@NelsonPerformance is offline Custom Tuning
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    Quote Originally Posted by DamnYankee View Post
    Stock...get them from the dealer.
    x100

    Her name is A Meli-
    "If everything is under control, you are going too slow."- MA
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  6. 05-13-2009 05:10 PM #6
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    cjriojas
    cjriojas is offline Govt funded since 2001
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    I bought a Delphi O2 from rock auto Auto Parts Fast at RockAuto $40 shipped and no problems since. I've had it on for about an oil change. Stealership charges out the wazoo. 100 bucks
    '02 Silvy: Z71 EC Step Side 5.3L Nelson tuned
    2013 GMC Acadia: SLT1 Carbon Black
    1976 Corvette Stingray: Trying to save it, progress is slow.

    ^Ricky's Sweet PS Skilz
    09/21/2010 02:31 <danger_ranger83> I'm not really worried about the looks...I want it to be fast and ugly...bc no one wants to get outrun by something ugly
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  7. 05-13-2009 06:16 PM #7
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    Quote Originally Posted by cjriojas View Post
    I bought a Delphi O2 from rock auto Auto Parts Fast at RockAuto $40 shipped and no problems since. I've had it on for about an oil change. Stealership charges out the wazoo. 100 bucks
    Delphi's are OE are they not?
    2006 Silverado
    Little Black Bitch
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  8. 05-13-2009 06:29 PM #8
    RedHeartbeat
    RedHeartbeat is offline WTH JUST HAPPENED?
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    They are what I buy and have had no issues with them other than one burning completely out once.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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  9. 05-13-2009 08:08 PM #9
    GasGuzzler's Avatar
    GasGuzzler
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    Nippendenso (Denso) makes them for GM as well. So do a few other companies. What matters is getting one by VIN whether at the dealer or online....don't settle for broad applications.
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  10. 05-14-2009 10:46 PM #10
    cjriojas's Avatar
    cjriojas
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    Dammit they were densos. My bad.
    '02 Silvy: Z71 EC Step Side 5.3L Nelson tuned
    2013 GMC Acadia: SLT1 Carbon Black
    1976 Corvette Stingray: Trying to save it, progress is slow.

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    09/21/2010 02:31 <danger_ranger83> I'm not really worried about the looks...I want it to be fast and ugly...bc no one wants to get outrun by something ugly
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