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RPMs Jump to 1200 at start - 2012 TRD

Discussion in '2nd Gen. Tacomas (2005-2015)' started by TRDHUNTR, Feb 27, 2012.

  1. Feb 27, 2012 at 9:51 PM
    #1
    TRDHUNTR

    TRDHUNTR [OP] Active Member

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    Hey guys,
    Question - Every time I start my truck in the morning, my RPMs jump and stay steady at 1200 RPMs when its still in park. It will not level back to 800-900 until I put it in drive. Happens also in evening when I leave work and truck has been parked for 9 hours. Temp is around 55 degrees in morning.

    Is this normal and does this happen to anyone else?

    TY
     
  2. Feb 27, 2012 at 10:37 PM
    #2
    forana

    forana Well-Known Member

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    My 4runner used to do this and it was normal. Would rev a little high and then settle down when warm.
     
  3. Feb 27, 2012 at 10:41 PM
    #3
    S7ICKlVlAN

    S7ICKlVlAN Cpt. Bubbleguts

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    Open loop operation
     
  4. Feb 27, 2012 at 10:42 PM
    #4
    Warhorseforever

    Warhorseforever Will The Thrill

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    My 1st gen does that it's just normal operation I believe, but you can check your owners manual and it will tell you.
     
  5. Feb 27, 2012 at 10:45 PM
    #5
    whiteboy

    whiteboy Well-Known Member

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    Kings, alcans, 33's blah blah read my build thread in sig
    Is it supposed to be idling at 1200? Mine starts up at 1500 and drops to about 1100 or 1000 when I throw it in D.
     
  6. Feb 27, 2012 at 10:48 PM
    #6
    S7ICKlVlAN

    S7ICKlVlAN Cpt. Bubbleguts

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    It should idle above normal speed until pre-spec parameters are met. Usually your thermostat temp needs to be met, certain amount of time elapsed, or 02 sensors warm up. Then you go into closed loop which utilizes the 02's & MAF to keep you near stoichiometric 14.7:1 A/F.
     
  7. Feb 28, 2012 at 9:25 AM
    #7
    TRDHUNTR

    TRDHUNTR [OP] Active Member

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    Wow, you know your stuff. Thanks guys for the response. It appears that the truck was engineered this way which is good to know.
     
  8. Feb 28, 2012 at 10:09 AM
    #8
    AlaskanTaco

    AlaskanTaco Well-Known Member

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    Every vehicle is engineered this way. It is warming up the cat, and pumping the cat full of air also so that it may convert co-co2 and hc-h2o. Ya, it has a secondary air pump to help do it too. :)
     
  9. Feb 28, 2012 at 10:48 AM
    #9
    neonlazer

    neonlazer Mechanically Goofy

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    My 12 did this off the lot..normal :)
     
  10. Feb 28, 2012 at 10:58 AM
    #10
    ItalynStylion

    ItalynStylion Sounds Gooooood

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    Yes....every single vehicle made today.
     
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