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Air pump bypassed

Discussion in '2nd Gen Tundras (2007-2013)' started by Jrpotts01, Jul 28, 2019.

  1. Jul 28, 2019 at 5:26 PM
    #1
    Jrpotts01

    Jrpotts01 [OP] New Member

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    I bypassed my air pumps today for about $30. I followed a thread that listed simple parts and detailed instructions. Used an automotive relay and a 4.7kohm resistor. Took about an hour

    KIMG0539.jpg
    KIMG0536.jpg
    KIMG0538.jpg
     
    baraynavab, equin, chugs and 6 others like this.
  2. Jul 28, 2019 at 6:02 PM
    #2
    Jrpotts01

    Jrpotts01 [OP] New Member

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  3. Aug 4, 2019 at 5:33 PM
    #3
    melcoeb

    melcoeb New Member

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    Were you getting error codes before you did this?
     
  4. Aug 4, 2019 at 7:44 PM
    #4
    Jrpotts01

    Jrpotts01 [OP] New Member

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    No, just bypassed it before it was an issue
     
  5. Aug 4, 2019 at 10:57 PM
    #5
    TunaDr

    TunaDr New Member

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    I joined to see what is possible
    I saw some posts of the more difficult bypass where they install the kit/plates and those people would report better mpg. Have you noticed any difference yet?
     
  6. Aug 5, 2019 at 3:25 AM
    #6
    Jrpotts01

    Jrpotts01 [OP] New Member

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    The block off plates are required if one or both valves are stuck open. Haven't checked mpg, hoping for good results though.
     
  7. Aug 5, 2019 at 8:15 PM
    #7
    Jrpotts01

    Jrpotts01 [OP] New Member

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    Block off plates are only required if the system failed and one or both valves are stuck open. It is a normally closed system, so if bypassed before their is an issue the valves are already closed. Haven't checked mpg yet.
     
    Pbear1454 and TheBeast like this.
  8. Aug 29, 2019 at 10:56 AM
    #8
    kgb4187

    kgb4187 New Member

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    Which 4.7kohm resistor did you use? There's 1W, 1/4 W, 1/2W on Amazon and I have no idea which one is best. And is there a good relay to go with?
     
  9. Aug 29, 2019 at 7:16 PM
    #9
    Jrpotts01

    Jrpotts01 [OP] New Member

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    This is what I used

    Screenshot_20190728-220617.jpg
    Screenshot_20190728-215604.jpg
     
    kgb4187 likes this.
  10. Aug 29, 2019 at 7:19 PM
    #10
    Jrpotts01

    Jrpotts01 [OP] New Member

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    This is really easy to install took me about an hour and that was taking my time.
     
  11. Sep 3, 2019 at 10:35 PM
    #11
    kgb4187

    kgb4187 New Member

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    I just ordered everything from Amazon, thank you!
     
  12. Sep 4, 2019 at 9:00 AM
    #12
    Jrpotts01

    Jrpotts01 [OP] New Member

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    Good luck
     
  13. Nov 27, 2019 at 3:35 AM
    #13
    Jeffro22

    Jeffro22 New Member

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    Thanks for posting.
     
    Last edited: Nov 27, 2019
  14. Nov 27, 2019 at 4:10 AM
    #14
    focal

    focal and the Warthog

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    Thanks for posting. I’m just learning about this cancer and am curious, on a scale of 1 to 10, how confident are you that it will prevent it from failing? Prevention is often immeasurable.
     
  15. Nov 27, 2019 at 5:02 AM
    #15
    blackoutt

    blackoutt YEAH BUDDY!

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    10. It disables the system/diagnostic so it'll never run the diagnostic/never fail.
     
    VWTim and focal[QUOTED] like this.
  16. Jan 6, 2023 at 6:03 PM
    #16
    Spenceman73

    Spenceman73 New Member

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    My sons 2008 4.7 had the p2443 code in July of last year, $220 for replacing the right side valve, mechanics comment on the work order was “valve does look new but is failing”. The truck threw the same code 2 months later, and the code went away on its own in a week or so. Today it threw p2441. Seems that this is a pretty common issue and I like the idea of this bypass. My question is does bypassing these pumps impact the engine or performance? I’m guessing not, otherwise folks wouldn’t be doing it, I just wanted to check first before going down this road. Thanks in advance.
     
  17. Jan 7, 2023 at 1:28 AM
    #17
    CMikeB

    CMikeB New Member

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    I wonder if it'll AFFECT emissions tests?
     
  18. Sep 24, 2023 at 6:27 AM
    #18
    baraynavab

    baraynavab Toyo Junkie

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    This does not effect emissions at all. What the circuit does is disable the emissions check at startup making the ECU think the temp is <50 deg F using the MAF sensor. The MAF sensor only thinks its <50 while startup using the starter relay resistor connection as shown. Once the engine is up and running starter relay resistor is disabled and the the MAF sensor works reporting normal engine temps.
     
  19. Oct 17, 2023 at 5:24 PM
    #19
    Orions Dad

    Orions Dad New Member

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    The valves can develop leaks the inside is made of thin material if this happens and you don’t have block plates installed it will throw a code
     

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