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bad cat do i need to replace or leave it off???

Discussion in '4 Cylinder' started by beckleyota, May 4, 2013.

  1. May 4, 2013 at 2:18 AM
    #1
    beckleyota

    beckleyota [OP] Well-Known Member

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    Well my cat on my 07 2.7 stopped up tonight so I went to a friend's and cut it off. Sure enough the guts were falling appart, so I put a pice of pipe in its place for now cel won't go off but it runs better than ever. Should I leave it off or do I need to replace it???
     
  2. May 4, 2013 at 3:18 AM
    #2
    Millertime187

    Millertime187 I'll be your huckleberry!

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    Up to you....you will loose MPG'S and the tree huggers will get mad, but I've ran several cars without them.
     
  3. May 4, 2013 at 8:38 AM
    #3
    beckleyota

    beckleyota [OP] Well-Known Member

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    The check.engine light is what bothers me the most
     
  4. May 4, 2013 at 11:41 AM
    #4
    beckleyota

    beckleyota [OP] Well-Known Member

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  5. May 4, 2013 at 11:45 AM
    #5
    Conman117

    Conman117 AWESOME MEMBER

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    Someplaces you have to have a cat. You can get fined if you don't have one. Check your local laws, see if there's anything about emissions.
     
  6. May 4, 2013 at 12:08 PM
    #6
    BamaToy1997

    BamaToy1997 ASE Master Tech Vendor

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    I am not a tree huger at all, but yeah, I do happen to concern myself with the air that my grandchildren are breathing.

    I would recommend replacing the cat. Your truck's performance level will actually be better because the computer is designed to take into account the fact that there is a catalytic converter installed. The exhaust flow through a functional catalytic converter is sufficient for good engine operation.

    OP mentioned concern over the CEL light. While they DO have "false" O2 sensor generators, and some places also sett a "bung" that pulls the post O2 sensor out of the airflow and tricks the computer into thinking that all is good. The PROPER way to do the repair is to replace the bad cat with a good replacement. At my shop I flat refuse to remove a factory cat and run it open.
     
  7. May 6, 2013 at 11:05 AM
    #7
    Fenwick1993

    Fenwick1993 Hillbilly

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    Full rebuild short of machine work, mean green motherfucker! Lime green block, hand-polished valve cover, and stickers! Too broke for real mods right now. Stonewall is my baby, but he's also a work truck.
    I know that here, at least, you have to have a cat. When I thought mine was bad, I contemplated pulling the guts out of it and just slapping its shell back under my truck, because there was no way I could afford another one. Thankfully, that was not the case for me.
     
  8. May 10, 2013 at 10:51 PM
    #8
    beckleyota

    beckleyota [OP] Well-Known Member

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    Well the local dealer doesn't want to warrenty it under the 8 year 80thousand mile emissions warrenty I'm really upset with Toyota right now and how they have handled this hole deal. I as a customer should never be talked town to and belittled. If this warrenty falls thru I'm probably going to get rid of the truck and go to something else
     
  9. May 10, 2013 at 11:07 PM
    #9
    Millertime187

    Millertime187 I'll be your huckleberry!

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    That sucks man!! I HATE DEALERSHIPS!!!
     
  10. May 10, 2013 at 11:29 PM
    #10
    TnRedNeck721

    TnRedNeck721 GO VOLS!

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    well if you are under the 8 year 80k miles. and dealer wont do it. maybe call toyota corp? from what i have read it seams like some dealers don’t want to do it. and or lie about stuff. but as soon as toyota corp gets called they jump on it and do it really fast. also if you have facebook, most dealers have a page now a days. say something about them not wanting to do it, and it expect a call from the dealer.


    this is just what i have read about working. the 2 main dealers around here do great work. at least I think they do because we have never had a problem. and right now we have 6 toyotas in a family of 5. and parents and brothers have had others in the past.
     
  11. May 14, 2013 at 9:37 PM
    #11
    Mad Man Marty

    Mad Man Marty Well-Known Member

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    Miller, why would removing it reduce MPG?
    Bama, if removed, why would it reduce power,etc? I thought a free flowing exhaust(to a point), would increase power.
    Beck, i believe a cat is a fed mandated emission device that is supposed to be on the truck. It will not pass at your next inspection test. Find a junk one, or replace with a high performance unit. Ive been told the aftermarket high pro is the way to go.
     
  12. May 15, 2013 at 4:03 AM
    #12
    Millertime187

    Millertime187 I'll be your huckleberry!

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    It will reduce you mpg because your computer is going to not be mixing your fuel/air correct. When you take a cat off the CEL will stay on and it will get worse MPG's.
     
  13. May 15, 2013 at 6:58 AM
    #13
    Mad Man Marty

    Mad Man Marty Well-Known Member

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    Miller, has anyone actually tried this?
    The only reason im asking is because i dont beleive when the government tells me thats what will happen.
     
  14. May 15, 2013 at 7:03 AM
    #14
    woodygg

    woodygg Well-Known Member

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    yet another reason I don't buy extended warranties. far too often they don't cover what breaks.
     
  15. May 15, 2013 at 7:27 AM
    #15
    Mad Man Marty

    Mad Man Marty Well-Known Member

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    Beckle,
    Your cat replacement is covered by a fed mandated 8/80k warranty.
    Call toyota corp & tell them what the dealer tried to do.
     
  16. May 15, 2013 at 7:46 AM
    #16
    Millertime187

    Millertime187 I'll be your huckleberry!

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    I've cut cats off a few cars(no inspection in ky) it really does make the MPG's go down. I I had a mustang GT I took them off but It was tuned for them gone and it did help it alot :)

    But yes unless you tune a newer car without a cat, the computer will try and make up for the emissions. Just like a bad O2 sensor will hurt MPGs but not much. Pretty sure it makes the run a little rich.
     
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