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bad catalytic converter

Discussion in '1st Gen. Tacomas (1995-2004)' started by buzzard1992, Feb 21, 2012.

  1. Feb 21, 2012 at 2:35 PM
    #1
    buzzard1992

    buzzard1992 [OP] Yep

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    I've got a 01 v6 tacoma. And my check engine light came on today got it checked and the catalytic converter is bad. Instead of buyin a new one I'm thinkin about just cuttin mine out and puttin a straight piece of pipe in place of it. What do yall think about that? It shouldn't mess anything up right?
     
  2. Feb 21, 2012 at 2:49 PM
    #2
    buzzard1992

    buzzard1992 [OP] Yep

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    Bump. I'm also in SC where we have no emission checks
     
  3. Feb 21, 2012 at 4:33 PM
    #3
    buzzard1992

    buzzard1992 [OP] Yep

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  4. Feb 21, 2012 at 5:28 PM
    #4
    98Woodrow

    98Woodrow Well-Known Member

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    My guess is you will not get many answers to this since what you suggest, though I understand some people do it, is a federal crime. Just guessing but they might think that it is not very smart for them to tell you they know how to do it, have done it, or approve of doing it. Again, I do not know--just guessing.:D
     
  5. Feb 21, 2012 at 5:58 PM
    #5
    Robertgeejr1

    Robertgeejr1 Well-Known Member

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    Hello I remember this from the other day
    http://www.tacomaworld.com/forum/performance-tuning/204645-catalytic-converter-needed.html

    you really need to replace it, it will mess with the computer.
    I used to have a 2001 mustang gt and did the high flow exhaust upgrade and replaced the factory with high flo cats and did not have a problem.
    they are tight up here on emissions, (they dont give a damn if its held together with duct tape) and they would really check the stang but she passed and never fliped a code.
     
  6. Feb 21, 2012 at 6:05 PM
    #6
    Steves104x4

    Steves104x4 Well-Known Member

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    BUCKLE UP! It makes it harder for Aliens to pull you out of your Truck.
    I WOULD not put a STRAIGHT PIPE. That's against the law.
     
  7. Feb 21, 2012 at 7:28 PM
    #7
    buzzard1992

    buzzard1992 [OP] Yep

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    I had no idea its against the law. but lets say i do it. well we have no emission checks here so my guess is if i were to do it i wouldnt get caught. but why would it mess with my computer. what would be the difference in it not workin or not bein there
     
  8. Feb 21, 2012 at 7:33 PM
    #8
    higherlux

    higherlux Well-Known Member

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    i don't have one

    i don't see it being against the law because my dad had the cat stolen off his truck and he took it to a muffler shop and they welded a straight pipe on it

    if it were against the law then i don't think they would have done it, right?
     
  9. Feb 21, 2012 at 7:36 PM
    #9
    Boerseun

    Boerseun Well-Known Member

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    Not sure, but the way I understand it is that without the cat the O2 sensor after the cat will not get the correct reading ( because the cat is no there to "filter" the gasses) so it will send the wrong signal to the computer, which in turn will adjust your fuel mixture to less than optimum, which will inturn impact your air/fuel sensor (pre-cat sensor) and you will start to get all kinds of error codes along with potential loss in mpg and power.

    Cats are expensive, but I have seen aftermarket ones that are much cheaper than the one at the dealer.
     
  10. Feb 21, 2012 at 7:45 PM
    #10
    buzzard1992

    buzzard1992 [OP] Yep

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    Yeah i don't really see it bein against the law either... i could be wrong though. and even if it is illegal honestly nobody with power to do somethin is gonna find out.
     
  11. Feb 21, 2012 at 7:49 PM
    #11
    SnowroxKT

    SnowroxKT AK SnowroxKT

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    Post Cat O2 sensor is what is giving a CEL and will continue to after a straight pipe is installed (most likely), there are ways around this for "offroad or racing use" like using spark plug anti-foulers and drill the first one out so the O2 sensor will fit, then screw the O2 sensor into the anti fouler, then screw that into the bung where the O2 sensor was. :cool:

    Edit: Reason this works, the O2 sensor doesn't "see" as many bad gases NOx I believe. If one anti-fouler isn't enough 2 can be used.
     
  12. Feb 21, 2012 at 7:58 PM
    #12
    buzzard1992

    buzzard1992 [OP] Yep

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    If i were to do this do you think i will get awful gas mileage and a loss of power? i really dont want that but i also dont wanna pay for a new cat
     
  13. Feb 21, 2012 at 9:02 PM
    #13
    SnowroxKT

    SnowroxKT AK SnowroxKT

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    Pre cat O2 sensor does all the afr, post cat O2 sensor controls the CEL for bad cat.

    there are 2 right?
     
  14. Feb 21, 2012 at 9:59 PM
    #14
    TacoMX

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    The second O2 sensor is only there to monitor the cat. So the CEL being tripped by the absense of a cat will not affect the A/F ratio...the CEL is just annoying.

    This can be fixed by using and URD O2 sim. And even aftermarket cats can trip a CEL. Most aftermarket cats are "high flow" and will trip a CEL.

    And to the person who said that running w/o a cat is a "federal offense" :rolleyes::rolleyes:....It would be a fixit ticket...and the OP lives in a state where there are no emissions testing...is a LEO going to check under his truck for a cat if he gets pulled over? [No]
     
  15. Feb 22, 2012 at 4:37 AM
    #15
    Robertgeejr1

    Robertgeejr1 Well-Known Member

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    Most aftermarket cats are "high flow" and will trip a CEL.

    Well that is not so. I put in a magnaflow highflo duel exhust system myself on a 2001 Mustang gt in 2004, with 2 new high flo cats, back to shorty headers, and never tripped the puter. went right out two months later and passed the Ill. emissions test. And never had a problem till a drunk driver tried to take us both out.
     
  16. Feb 22, 2012 at 5:25 AM
    #16
    98Woodrow

    98Woodrow Well-Known Member

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    It is required to be on there by law. I think it is against the law to take it off. That said, do not think I ever heard of someone getting arrested for it. It will throw a CEL code, but you can just ignore that. I have heard of people driving cars for YEARS without them. When you go to sell it though, you are probably going to have to come clean and replace it.

    Companies in states with emissions testing sometimes pound a straight pipe thru the cat, then replace the cat right before the test.
     
  17. Feb 22, 2012 at 5:47 AM
    #17
    98tacoma27

    98tacoma27 :POOPCORN: Staff Member

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    I ran mine 98 for over a year with a bad rear O2 and no ill affects.

    OP, there are other potential causes to the 420 code that you should investigate before getting a new CAT. Also, I've seen/read where people have used Walker CATS withouth issues. Keep in mind you have two CATS not just one.
     
  18. Feb 22, 2012 at 6:18 AM
    #18
    TacoMX

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    yes...IIRC an exhaust leak can trip a P0420 code. I had a cracked manifold and it was setting off that code.
     
  19. Feb 23, 2012 at 7:46 AM
    #19
    buzzard1992

    buzzard1992 [OP] Yep

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    Yeah im startin to think its not the CAT. Ive been told if the CAT went bad i would know it. When the CEL came on the truck ran no different. Everything seems fine and normal
     
  20. Feb 23, 2012 at 9:57 AM
    #20
    TacoMX

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    Any unusual ticking coming from the engine bay? I had a tick for the longest time that I thought was normal for the 2.7L. Turns out it was a cracked manifold. Replaced that, tick went away, and so did the CEL/P0420 code.

    :notsure:
     
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