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What do you make of this?

Discussion in '1st Gen. Tacomas (1995-2004)' started by Tacoguy, Nov 18, 2009.

  1. Nov 18, 2009 at 5:12 PM
    #1
    Tacoguy

    Tacoguy [OP] Well-Known Member

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    Bed Liner, Running Boards, Cargo Net, Deck Plate Mod, K&N Air Filter, NGK Iridium Spark Plugs
    I'm at my witts end as far as MPG is concerned. My MPG has dropped from 18-19 to about 15-16. Now this tank seems to be even worse.

    Recent maintenance:

    -Iridium Plugs 8k miles ago
    -Cleaned KN Filter
    -Replaced Fuel filter 500 miles ago
    -Constantly use Lucas injector cleaner
    -Also used Gumont Regane this last fill up
    -Tried cleaning MAF, However stripped a screw, so its hard to clean it. :D
    -Seafoamed twice using vacuum line
    -Been using Royal Purple synthetic for about 10k miles
    -Changed Differential Fluid with Mobil 1 synthetic
    -Also reset ECU

    Now, today I noticed one more thing. Once I started the engine for about a minute and turned it off, I noticed a gasoline smell coming from the exhaust.

    Could that be a bad O2 sensor? Or just winter gas?
     
  2. Nov 18, 2009 at 5:20 PM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    FIrst, I would recommend not using those injector cleaners and off the shelf additives. Second, It sounds as though you may have an O2 going. I would also suggest going to Denso Dual grounds vs the Iridiums.
     
  3. Nov 18, 2009 at 5:25 PM
    #3
    Tacoguy

    Tacoguy [OP] Well-Known Member

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    I too thought of going to Denso Dual Grounds, however I hate to think I wasted so much money on Iridiums for nothing. Only 8k miles used.

    I really do not think that Lucas Upper Cylinder Lubricant is all that bad. A lot of people use them and it works. I also use it all the time in my corolla, and it is just fine.

    As far as the O2 is concerned, I thought that if it was bad I would get a check engine light?
     
  4. Nov 18, 2009 at 5:27 PM
    #4
    Toyota Truck

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  5. Nov 18, 2009 at 5:28 PM
    #5
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    getting there....
    definitely sounds like an o2 sensor is heading out on ya. you will get a cel, but only when the sensor isnt functioning.
     
  6. Nov 18, 2009 at 5:28 PM
    #6
    Tacoguy

    Tacoguy [OP] Well-Known Member

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    Forgot to mention that I seafoamed twice. LOL

    Both times through the vacuum line.
     
  7. Nov 18, 2009 at 5:28 PM
    #7
    riggsjt

    riggsjt Well-Known Member

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    Seafoam does work on everything
     
  8. Nov 18, 2009 at 5:34 PM
    #8
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Not always in regards to the O2.

    To be honest, how can you tell the difference with the Lucas?
     
  9. Nov 18, 2009 at 5:37 PM
    #9
    Tacoguy

    Tacoguy [OP] Well-Known Member

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    I really can't but I know a lot of people who swear by it. I am kind of a sucker like that. lol
     
  10. Nov 18, 2009 at 5:43 PM
    #10
    Tacoguy

    Tacoguy [OP] Well-Known Member

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    Well since it is sounding like an O2 Sensor, has anyone had to replace theirs yet?
     
  11. Nov 18, 2009 at 5:49 PM
    #11
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Lots of people have. Myself included on my 98
     
  12. Nov 18, 2009 at 5:52 PM
    #12
    Tacoguy

    Tacoguy [OP] Well-Known Member

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    My truck has 53,000 miles. Does that seem a little soon for an o2 sensor?

    Also where did you get your o2 sensor and how much was it?
     
  13. Nov 18, 2009 at 5:53 PM
    #13
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    getting there....
    replaced my bank 1 sensor 1(upstream) a few weeks back. not hard at all. the clip is the biggest bitch about it.
     
  14. Nov 18, 2009 at 5:54 PM
    #14
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    getting there....
    my truck only had right at 60k.

    got my sensor from the stealership.....right about $215 or so.

    rockauto.com has the alot cheaper.
     
  15. Nov 18, 2009 at 6:00 PM
    #15
    Tacoguy

    Tacoguy [OP] Well-Known Member

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    Damn, that is quite a bit. However this bad gas mileage is driving me crazy. I suppose I should test the older one before I replace it.

    Most likely, would the bad sensor be the upstream one?
     
  16. Nov 18, 2009 at 6:03 PM
    #16
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    getting there....
    thats the one that goes most often i believe.
     
  17. Nov 18, 2009 at 6:06 PM
    #17
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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  18. Nov 18, 2009 at 6:42 PM
    #18
    quattrokiwi

    quattrokiwi Well-Known Member

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    The primary/upstream is the one that controls fuel mix, the secondary has nothing to do with fuel, it just makes sure the cat is working OK.

    O2 sensors have a life span, they wear out like anything else. I replace mine based on mileage, around 80 to 100000 miles, but they can fail earlier
     
  19. Nov 18, 2009 at 8:45 PM
    #19
    ETaco23

    ETaco23 Marshall offroad Fabrication

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    Just did mine at 110K and got it at RockAuto.com for a descent price.
    its perty easy to do, its just that stupid little clip that a bitch to get to and up plug.

    I will be checking my MPG's soon.
     
  20. Nov 18, 2009 at 8:46 PM
    #20
    ETaco23

    ETaco23 Marshall offroad Fabrication

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    So should we be replacing the Bank2 sensor as well? the one for the cat.
     
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