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Help needed, miss 2001 4.7

Discussion in '1st Gen Tundras (2000-2006)' started by JoeBear, May 2, 2018.

  1. May 2, 2018 at 5:00 PM
    #1
    JoeBear

    JoeBear [OP] New Member

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    Hello, new to Tundras and the forum

    Have a slight problem puzzling me. Truck has a miss when cold. If I let it warm up its fine, even idles great cold but underload (climbing) i get a missfire to the point it bucks. No light and checked, also no codes.
    I suspected an O2 sensor, looked to price them and am given choices of O2's and AF (air/fuel)
    My questions, the truck has O2s or AFs?
    and any ideas on what i could check other than O2s? or think i am on the right track?
    Thank you in advance for any and all help, ... Joe
     
  2. May 2, 2018 at 5:08 PM
    #2
    Professional Hand Model

    Professional Hand Model Fred Brookes

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    As far as I know and remember bad O2’s were never a problem for me like you are having when they went bad. My mechanic said don’t worry to fix right away unless you really want to fix it right away. My check engine light would come on, but I would reset it constantly knowing it was o2.

    Another problem I had was similiar to what you describe was fixed by buying a brand new gas cap! Got that fuel reading you described as AF. Bought a new gas cap and that fixed it. Something about the seal. New cap is about $15?
     
  3. May 2, 2018 at 5:14 PM
    #3
    ARamirez73

    ARamirez73 JUST A HOBO RIDIN' THEM RAILS TO ANYWHERE

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    THE LONE STAR STATE...RGV TEXAS
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    Rough Country 6" lift / 35x12.50R20 Cooper Discoverer ST Maxx/ 20x9 +20 Fuel wheels "Mavericks" (Came with) / S&B CAI/ 2-10" Rockford Fosgates R2/ Massive Audio Nano N2 amp (Came with)/ KatSkins seat covers (Came with)/ Weathertechs window vent visors and floor mats/ 1A-AUTO.com aftermarket tow mirrors/ Undercover tonneau bed cover/ Viper alarm 3305V/ Flowmaster Super 40 Dual in-out/ 40" led light bar/ TRD Pro grille/Rough Country 30" LED light bar/TRD rear sway bar/ Ranch Hand legend grille gaurd
    Welcome from Texas
     
  4. May 3, 2018 at 8:27 AM
    #4
    JoeBear

    JoeBear [OP] New Member

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    Hello Lone Star,
    Greetings from Pennsylvania

    OK got a new cap today, sure hope it's the fix, love this truck.
    They are solid built and the trq. these engines make is perfect.

    Will update, I thank you both ☺
     
  5. May 6, 2018 at 5:31 PM
    #5
    Brown Bear

    Brown Bear New Member

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    6" RCD lift in front. Custom leaf springs in rear 4" lift. 17" race line, raptor wheels. 35" Goodyear Duratrac. 4.88 gears. ARB rear air locker. ARB air compressor and tank. Black Oak Led 40 watt ditch lights.
    Could be an Ignition coil.
     
    mudslinger79 likes this.
  6. May 19, 2018 at 11:16 AM
    #6
    aRabidLunatic

    aRabidLunatic Professional Hobo

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    Was it the gas cap?
     
  7. Jun 1, 2018 at 4:55 PM
    #7
    JoeBear

    JoeBear [OP] New Member

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    OK update, replaced gas cap, no luck
    Keep driving and finally got a mil light and code
    P0430 Catalyst System Efficiency Below Threshold (Bank #2)
    Where do i start with this? is it an O2 or the Cat?
    Thanks in advance,
     
  8. Jun 1, 2018 at 8:42 PM
    #8
    Jerry311SD

    Jerry311SD New Member

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    O2 would be a cheaper try then the cat....
     
  9. Jun 1, 2018 at 10:24 PM
    #9
    JoeBear

    JoeBear [OP] New Member

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    Bank 2 is pass. side behind cat?
     
  10. Jun 2, 2018 at 2:11 PM
    #10
    Jerry311SD

    Jerry311SD New Member

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    Yes
    I'd replace the O2 behind the cat. Unhook the battery for a few minutes to reset the check engine light.

    02 sensor is more likely to go bad then a cat......
     
  11. Jun 13, 2018 at 8:01 AM
    #11
    JoeBear

    JoeBear [OP] New Member

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    OK decided I'm going to do Cats and O2's
    Considering I wont have a way to a parts or hardware store once I pull this apart
    Would anyone know what hardware I will need?
    What size nuts/bolts
    and from what i can see the rear O2s are stud mounted?
    what size nuts there too?
    I'm going to go with all stainless steel

    Thanks again for all the help,
     

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