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Thread: Removing cats

  1. #1

    Default Removing cats

    How do I trick the rear O2 sensors (behind the cat) if I were to remove the cats on my 2000 silverado?
    2000 Silverado ext cab1500 Z71
    Have:
    -K&N
    -SPR-17S Fronts with 100RMS watts to each
    -Billet Grill
    -Bedliner
    -Catback Flowmaster Exhaust
    -CDA-9884 Head unit w/ iPod hookup
    -2 KFC-W3011 subs (seperate boxes 1 cu ft air space each) powered by a KAC-9104D 900 watt RMS monoblock amp
    -SPR-57C rear speakers
    -Door dings
    -Leveling kit (2.5" torsion keys)

    Want:
    -6" Suspension Lift
    -35" tires (maybe 38s)
    -HID/projector headlights
    -Headers
    -Programmer/Tuner

  2. #2

    Default

    install dummy sensors i guess

  3. #3

    Cool removing cats

    O2 simulators are the cheapest way if you can find them. Most people quit making them and some of the ones still made just dont work. A Diablo Preditor programmer has the ability to trick the ecm into not throwing a o2 code, but the rear o2 still has to be installd and plugged in. I run highflow cats on my 05 Silverado and they were throwing codes so I just turned the rear codes off.

  4. #4
    Jr. Engineer
    Join Date
    Jan 2009
    Location
    Rochester, MN
    Posts
    231

    Default

    Quote Originally Posted by silveradotrailblazer View Post
    O2 simulators are the cheapest way if you can find them. Most people quit making them and some of the ones still made just dont work. A Diablo Preditor programmer has the ability to trick the ecm into not throwing a o2 code, but the rear o2 still has to be installd and plugged in. I run highflow cats on my 05 Silverado and they were throwing codes so I just turned the rear codes off.
    X2 - either simulators, a Predator, or a custom tune. The rear O2's don't need to be plugged in with a Predator though.
    99 Silverado Z71 4.8
    2" Suspension lift (Add-a-leafs and leveling keys)
    Long tube headers with 3" offroad Y-Pipe
    Volant Cold Air Intake with Ram Air Intake Tube
    Jet Mass Air Flow Sensor
    Diablosport Predator Tuner

    Previous Truck:
    97 Suburban K1500
    3" Body lift
    2" Suspension Lift (Add-a-leafs and cranked up torsion bars)
    35" Yokohama M/T's
    K&N Intake
    Airraid Throttle Body Spacer
    Hypertech Programmer
    Dual Flowmasters

  5. #5

    Default

    If you do remove the cats make sure you don't run the truck with the check engine light on because you will be operating in an open loop situation and your performance will suffer.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  6. #6
    Master Mechanic CarpenterGuy's Avatar
    Join Date
    Jul 2008
    Location
    Leeds, Alabama
    Posts
    994

    Default

    i'm lookin at getting high flow cats. it seems like less effort
    2006 Silverado Z71 - 97,000 - totaled, RIP
    2006 Silverado Z71 - 122,000 (K&N 77 Series CAI, PowerAid TBS, Magnaflow dual rear exit, 33x12.50 Mickey Thompson MTZ, Tuff Country Torsion Keys, Tuff Country Add-A-Leafs)
    1966 C10 swb stepside (Gen I 350, Turbo 400 trans, dual cyl power brakes, front discs)
    I'll keep my money, guns, and freedom. You keep the Change.

  7. #7
    Jr. Engineer
    Join Date
    Jan 2009
    Location
    Rochester, MN
    Posts
    231

    Default

    Quote Originally Posted by Jimmiee View Post
    If you do remove the cats make sure you don't run the truck with the check engine light on because you will be operating in an open loop situation and your performance will suffer.

    No, you will be fine. It will run in closed loop. The second O2 sensor does not affect performance in any way, shape, or form. If you have a check engine light on, it will not make you go into open loop. I don't know where you got this information but it is totally wrong.

  8. #8
    Master Mechanic Dr_Zero's Avatar
    Join Date
    Mar 2006
    Location
    Sunny Florida
    Posts
    706

    Default

    You used to be able to O2 sims from this fellow (whos site is now gone but thanks to the wayback machine we can still see it)
    Casper

    But you can still get them here
    O2 Sim

    Or you can make your own!

    http://www.mkiv.com/techarticles/oxy...sor_simulator/

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