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  • #1

    Lean O2????????

    Sorry this post should have gone here first.

    I have gotten a couple of Left O2 Sensor lean codes?

    What does this mean? My MPG has gone to sh*t and I have a rough idle.......Is my O2 sensor going or am I really running lean....the SES code is infrequent, but the number on my scanner when I monitor the left sensor are much lower than the right.......

    Any help is appreciated.
    Joel<br />God is my copilot, but Satan has his foot on the gas!<br />94 3.4L AutoCamaroRagtop w/MSD ignition,Accelcoilpacks,K&N FIPK,BMR SFC&STB,3\"Catco w/3\"catbackSS muffler,JetStage 2,HomemadePIAAheadlightconversion <a href=\"http://www.geocities.com/cardiac1968\" target=\"_blank\">http://www.geocities.com/cardiac1968</a>
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  • #2
    If the PCM thinks a bank is running lean due to a bad O2, wouldn't it attempt to add more fuel, making you run rich and killing gas mileage?

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    • #3
      Try running a couple of bottles of fuel injector cleaner through your system. Looking at your mods, I see no reason for you to go lean unless your'e not getting enough fuel from the injectors or the fuel pump. I guess that you can check your fuel pressure also.
      <b>1998 Firebird 3800 Series II, A4</b><br />Direct-Flo Lid,K&N Filter,DEE TB Spacer,TPS-TEC,ZZP Mini-AFC,Raised and Cutout Airbox 7mm,BMR STB & Boxed LCAs,KYB AGX Shocks,Drilled/Slotted Rotors,180* Thermo,2.5\" Catco Cat,Dynomax 2.75\" custom catback,Kumho Ecstas/245,Jet Stage 2,3.42,Edge Racing 2870 Stall,B&M Tranny Cooler,B&M Deep Tranny Pan,LSD,AAM Girdle,1LE DS,NX Wet Kit,MSD DIS-4,MSD Blaster Coil Packs,Taylor Spiro Pro 8mm Wires,NGK TR6\'S gapped .045,ZZP UD WP Pulley,SLP Fan Switch,TT II\'s<br />N/A: 15.6342 @ 88.44 (On stock converter. Strugglin\' to beat it.)<br />Nitrous 50 Shot: 14.7463 @ 93.49

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      • #4
        moving to general tech.

        This seems pretty basic problem diagnostic, mpg loss.

        I'm cracking down on non-advanced topics in advanced tech.. Seems as if it's gotten a little more lax in that section.

        [ April 28, 2003: Message edited by: Magnus ]</p>
        Keith - Chicago<br /><a href=\"http://www.hptuners.com\" target=\"_blank\">HP Tuners - PCM Reprogramming</a><br /><a href=\"http://www.dxsoftware.com/magnus/\" target=\"_blank\">97 Firebird V6 to LS1 swap</a><br /><b>V8 9.967@132.78</b> 1.322 60\' NA Heads/Cam<br /><b>V8 10.295@128.48</b> 1.363 60\' NA Cam Only<br /><b>V8 10.987@119.31</b> 1.422 60\' NA Stock Internals<br /><b>V6 13.674@98.22</b> NA<br /><b>V6 12.394@104.91</b> N20 100HP

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