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Wretched gas mileage?

Discussion in '1st Gen Tundras (2000-2006)' started by Need to know stuff, Dec 7, 2018 at 10:04 AM.

  1. Dec 7, 2018 at 10:04 AM
    #1
    Need to know stuff

    Need to know stuff [OP] New Member

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    So, I'm getting about 8-10 mpg and the only hint I have to why is that my check engine light was on. I checked it out eith OBD2 and the only code it threw was about bank 2 catalyst. Which is the second catalytic converter. I read up a little bit about this code and it seems that it could be carbon buld up on the O2 consors.

    Also when I'm idling it seems to run a little rough but is not throwing any codes for any misfires.

    Also when I started it up this morning and forgot something in the house and come back it was dripping liquid (didn't check if it was gas or not)

    20181207_073404.jpg
     
  2. Dec 7, 2018 at 10:10 AM
    #2
    Festerw

    Festerw New Member

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    More than likely just condensation from the tail pipe. Change all 4 oxygen sensors, new plugs, and clean the MAF sensor. Then check your mileage.
     
    15whtrd likes this.
  3. Dec 7, 2018 at 10:23 AM
    #3
    15whtrd

    15whtrd I tried being reasonable, but I didn't like it.

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    Yeah start with the O2 sensors and go from there. Not a bad idea to change the plugs as it’s fairly inexpensive. And it’s possible they could be out of spec if it’s been running bad for a while. My Sequoia was throwing a code 1 rear O2 sensor. I replaced both and the light went away as well as the truck ran much better.
     
  4. Dec 7, 2018 at 2:39 PM
    #4
    Professional Hand Model

    Professional Hand Model Fred Brookes

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    I’m getting 9-12 mpg city with my 2002 V8 SR5 and my engine is at perfect optimization right now. 160k miles. Without detailing everything, she has been tuned to perfection. Highway 16-18.285/75/r16
     
  5. Dec 7, 2018 at 4:45 PM
    #5
    Darkness

    Darkness New Member

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    No need to change all 4, that's expensive. Change just the bad one out. See if that helps before doing other expensive stuff.

    Do free/cheap stuff. Clean or replace air filter, clean MAF sensor, clean throttle body plate, change spark plugs. Check tire pressure. That's unusually low gas mileage.
     
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  6. Dec 8, 2018 at 6:13 PM
    #6
    Need to know stuff

    Need to know stuff [OP] New Member

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    I'll do the cheap stuff at first, spark plugs, cleaning ect. Maybe have a mechanics opinion on it.
     
  7. Dec 9, 2018 at 6:45 PM
    #7
    Lost Highway

    Lost Highway New Member

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    It would be helpful to know the number of miles on that low mpg truck, it would also be good to know if you are a lead foot or a light footed driver?

    If you are going to go the cheap route, you will most likely spend more time under the hood than you can afford, and still not save any money. If one o2 sensor is bad the others aren't far behind, so how many times do you want to jack that truck up and climb under it.
     
    15whtrd likes this.
  8. Dec 9, 2018 at 6:56 PM
    #8
    15whtrd

    15whtrd I tried being reasonable, but I didn't like it.

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    TRD Pro suspension, 20% ceramic tinted windows, charcoal filter delete, aFe drop in pro s dry air filter, TRD airflow accelerator, TRD oil fill cap, TRD 18 psi radiator cap, BDX Bullydog tuner, Weathertech floor mats, rear seat fold down mod, Tyger soft tonneau cover, Linex with uv protection, TRD swaybar, TRD center caps, TRD Pro grille insert, Real truck tailgate seal, Pop-n-lock tailgate actuator, rear diff breather relocate.
    Along the lines of my thoughts. I had a light come on and it was the right bank downstream O2 sensor. Decided to change both downstream 02 sensors. Left the upstream ones alone. It’s been fine for a year. Now that I think of it... it could’ve been the upstream sensors.
     

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