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o2 sensor

This is a discussion on o2 sensor within the Camaro / SS forums, part of the Vehicle Specific category; I found out i have a bad o2 sensor causing me to run lean. when i replace it what exactly ...

  1. #1
    Member jakez28's Avatar
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    o2 sensor

    I found out i have a bad o2 sensor causing me to run lean. when i replace it what exactly should i replace, the whole wiring harness or just the sensor? i know its located right next to the cat going into the manifold but is there just one sensor id have to replace or is there another one also?
    1998 Camaro Z28 M6 Hard Top - Sebring Silver - All Original, Bone stock
    1998 Camaro Z28 M6 T-Top - Arctic White - Free Mods, Lid, TB Bypass, 160* stat, Racetronix HP255Lph, Exhaust cutout, LT1 Eibach Springs, Bilstein HDs, Poly Sway Bushings, BMR STB, Torsen gear LSD 10 Bolt

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    Member c5z28's Avatar
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    Should just replace the sensor

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    Member jakez28's Avatar
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    someone told me that ls1s have 4 o2 sensors, and id have to run an OBDII scan to see which ones need replacing is that true

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    Member c5z28's Avatar
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    Quote Originally Posted by jakez28 View Post
    someone told me that ls1s have 4 o2 sensors, and id have to run an OBDII scan to see which ones need replacing is that true
    Yes 2 before the cats and 2 after, if you don't know which one get it scanned-no big deal.

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    Junior Member khickenwang's Avatar
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    Does bad o2 sensors make you use more gas than normal? Because 2 of mine went out and I burn a whole tank of gas in 1 week and I do little driving to work. I have long tube slp headers and borla exhaust stage 3 clutch

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    Member c5z28's Avatar
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    o2's tell the computer if you run lean or rich so get that fixed.

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    Junior Member khickenwang's Avatar
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    Quote Originally Posted by c5z28 View Post
    o2's tell the computer if you run lean or rich so get that fixed.
    I got them fixed today but what does that mean? run lean or rich?
    Last edited by konigandy6; 05-02-2010 at 01:33 PM.

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    Member c5z28's Avatar
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    Quote Originally Posted by khickenwang View Post
    I got them fixed today but what does that mean? run lean or rich?
    Usually rich, but the o2 reads if the motor runs lean or rich and adjusts accordingly. If you don't have o2's then the car has no way of teling
    Last edited by konigandy6; 05-02-2010 at 01:34 PM.

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    Run rich = to much fuel

    Run lean = not enough fuel

    The optimum air fuel ratio is appoximately 14.7 to 1. This is called "stoichiometric". For every 14.7 parts of air, the combustion chamber wants 1 part of fuel. In a nutshell: Running an engine lean increases combustion chamber temps and can result in knock. Running rich burns more fuel and you get black smoke from the tailpipe.

    The optimum air/fuel changes with engine speed and load. At WOT, you actually want to see something like 12.5:1 or thereabouts. Adding forced induction, like a supercharger or a turbo changes everything; as does running ethanol which requires an air/fuel as rich as 8.5:1, or so.

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