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Universal Catalytic Converters???

Discussion in '2nd Gen. Tacomas (2005-2015)' started by bajaracer, Jun 10, 2008.

  1. Jun 10, 2008 at 8:52 PM
    #1
    bajaracer

    bajaracer [OP] Well-Known Member

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    I went to the dealer and was told that the cats on my 2001 Taco 3.4 Prerunner were bad and be charged $1900 to replace,, TOO MUCH!!! So I took my Taco to a local muffler shop and replaced them with some universal Magnaflow cats. My engine light stayed on. I took the truck back to the dealer and after hours of checking everything, incluiding the O2 sensors & MAF, they came to the conclusion that why it kept on reading an OBD II code was that my cats WERE TOO MUCH OF A FREE FLOW CAT and that they were not burning up the entire gases, thus the engine light remained on. They did tell me i could "drive the truck to the ground" and everything would be ok.My concern is that i was told by a local perfomance shop mechanic that if i did not replace those cats with some HEAVY METAL CATS i would BURN MY PISTON RINGS. Oh, he would charge me $1000 to replace them. Has anyone heard of this happening or experienced something like this? I am confused as to what to do, repalce the, leave them,, any ideas???:confused:
     
  2. Jun 10, 2008 at 8:59 PM
    #2
    lsocoee

    lsocoee My hair is all natural Moderator

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    technically speaking, I don't know why a high flow cat would hurt your piston rings. They seem completely unrelated. However, I have no first hand knowledge on this subject, just going on my limited knowledge of how these systems work together.
     
  3. Jun 10, 2008 at 9:11 PM
    #3
    bajaracer

    bajaracer [OP] Well-Known Member

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    Ever heard about a "O2 Cheater"?
     
  4. Jun 10, 2008 at 9:57 PM
    #4
    zmtnbik

    zmtnbik FMLYHM

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    Gotta love the old days.
    In my 82, I just removed the cat and put in a straight pipe. Northwest Off-road used to sell the straight pipes as a "test pipe". The idea being that if you're cat wasn't working properly you could put in a test pipe to see how much flow improved. Anyway, since they didn't have 02 sensors, it was never an issue.

    Good luck with what ever you end up doing......sucks to have to deal with this smog crap.
     
  5. Jun 10, 2008 at 10:15 PM
    #5
    bajaracer

    bajaracer [OP] Well-Known Member

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    I dont have to deal with emissions because of where my truck is registered. But do you know or heard of any internal engine damage caused by cats that were too "free flow"???? i dont want to spend $ if i dont have too? Truck runs fine, have towd a jeep and carried 5 people on a lenghty trips and truck is idling fine.
     
  6. Jun 10, 2008 at 10:20 PM
    #6
    itsmyturn

    itsmyturn Well-Known Member

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    1 cat, 2 cats, 3 cats, no cats. it doesn't matter, your piston rings will be fine. your taco being an 01 needs a 3way cat(for 3 different gases) if the muffler shop installed 2 way cats then that MIL will never turn off.:cool:
     
  7. Jun 10, 2008 at 11:00 PM
    #7
    bajaracer

    bajaracer [OP] Well-Known Member

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    thanks,, i guess they wanted my $$$,,, any advice on turning off that light?
     
  8. Jun 11, 2008 at 3:09 PM
    #8
    lsocoee

    lsocoee My hair is all natural Moderator

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    take out the bulb. Put a piece of electrical tape over it.

    Maybe an O2 sim would work. URD sells them for the 2nd gen.
     
  9. Jun 11, 2008 at 4:37 PM
    #9
    bajaracer

    bajaracer [OP] Well-Known Member

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    02 sim?? never heard of it. what does it do and where does it go?
     
  10. Jun 11, 2008 at 4:44 PM
    #10
    lsocoee

    lsocoee My hair is all natural Moderator

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  11. Jun 11, 2008 at 5:13 PM
    #11
    bajaracer

    bajaracer [OP] Well-Known Member

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    had anyone ever try this URD Oxygen Sensor Simulator????
     
  12. Jun 11, 2008 at 5:14 PM
    #12
    lsocoee

    lsocoee My hair is all natural Moderator

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    a lot of 05+ people run the similar one so that they can run long tube headers.
     
  13. Jun 11, 2008 at 5:23 PM
    #13
    Ridgerunner

    Ridgerunner Well-Known Member

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    Want a totally boring opinion? If you havent already, do an exhaust mod-you have a nice group of addons for breathing as it is. Beyond that, your engine is doing a fantastic job moving that truck around...especially on them 33's. Jus my opinion though-I personally dont like to mess with sensors and such too much-especially on our motors-Toyota engineered them to a T as it is:)
     
  14. Jun 11, 2008 at 7:33 PM
    #14
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    There is no code to tell you your cats are too free of a flow. If its a new cat. It may take some time before it "breaks in" and starts to heat up the gas as it should. IMHO, You should just clear the code and drive it for a while. Maybe 2 tanks of fuel. If the light stays on, talk to the shop that did the install. It may be a defective cat. :)
     
  15. Jun 11, 2008 at 10:00 PM
    #15
    bajaracer

    bajaracer [OP] Well-Known Member

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    i took it to the dealer and was shown a graph after they did a complete diagnostic that the cats flowed "too free" and werent burning up all the excess gases.
     
  16. Jun 11, 2008 at 11:05 PM
    #16
    itsmyturn

    itsmyturn Well-Known Member

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    post your P0xxx fault that the dealership gave you. sometimes things aren't always what they seem, and P0 codes can do that.
     
  17. Jun 12, 2008 at 1:33 PM
    #17
    bajaracer

    bajaracer [OP] Well-Known Member

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    This is exactly what the dealer wrote: " 91275 UPON INSPECTION FOUND VEHICLE HAS PO420- CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK1) - NECESSARY TO INSPECT SYSTEM. UPON INSPECTION FOUND AFTERMARKET CATS NOT PERFORMING TO SPEC. PERFORMED NECESSARY CHECKS ON A/F SENSOR AND 02 SENSOR. FOUND A/F SENSOR READING 350 DEGREES FAHR. AND FOUND 02 SENSOR READING 230 DEGREES FAHR. 02 SENSOR NEEDS TO BE AT AROUND 600 DEGREES FAHR NECESSARY TO MANUALY CHECK SENSORS TO VERIFY NORMAL OPERATIONS. SENSORS CHECKED OK. UPON INSPECTION FOUND CATS NOT REDUCING ENOUGH EMISSIONS THEREFORE NOT HEATING PROPERLY. RECOMMEND REPLACING CATS FOR PROPER REPAIR.
     
  18. Jun 12, 2008 at 1:38 PM
    #18
    bajaracer

    bajaracer [OP] Well-Known Member

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    I dont want to spend $ on new cats, think that current set up is better than stock,, should i jst by the 02 SIM to trick comp and leave it alone??? (when mechanic read this he said my piston rings were going to fry) i think he wants my $
     
  19. Jun 12, 2008 at 6:08 PM
    #19
    itsmyturn

    itsmyturn Well-Known Member

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    looking at the data the dealer gave you, i not sure that is entirely correct. o2 sensors heat up not only from exhaust gases but also due to the heating element inside the sensor itself. hence ho2s(heated oxygen sensor). that heating elemet is controlled via the ecm. usually heated o2 sensor are placed only in front of the cat or upstream which monitors fuel trim. Your p0420 fault is set by the rear o2 sensors which monitors catalyst efficiency. Rear or downstream sensors don't tend to heat up as much. if you really want to keep the hi flow cats, the o2 simulator would do the trick but you would probraly fail emissions tests.
     
  20. Jun 14, 2008 at 1:15 PM
    #20
    bajaracer

    bajaracer [OP] Well-Known Member

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    thanks, as long as nothing happens to my engine and i can turn off the engine lite with the 02 sim then i will be happy
     
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