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Rough Idle When at a Stop

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Shaowei, Dec 18, 2012.

  1. Dec 18, 2012 at 9:39 AM
    #1
    Shaowei

    Shaowei [OP] Well-Known Member

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    Ryan
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    I have a 2005 double cab with a V6-Auto with K&N AF that has approximately 90k miles. Generally, I love this truck. My biggest complaint is a rough idle (sound and a slight vibration) when I am at a stop, which is frequent in rush hour.

    This is the situation. When the truck is in Park, the engine idles perfectly. No sound or vibration. When the truck is in Drive and I'm stopped, the engine idles roughly which includes sound and a slight vibration. The engine RPM is slightly lower than in Park (which I would expect). If I just barely press on the gas (while the other foot is on the brake) the rough idle disappears. When I begin moving the sound and vibration is usually present until about 15-20 mph. The rough idle occurs nearly 95% of the time, the other 5% is beautiful silence!

    I know without seeing/hearing the idle in real life this is a stretch but would appreciate any ideas to start trouble shooting. Thanks!
     
  2. Dec 18, 2012 at 9:46 AM
    #2
    blakes09

    blakes09 Toyota Tech..when im not Fishing

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    hows the motor mounts?
     
  3. Dec 18, 2012 at 10:18 AM
    #3
    Rollntoys

    Rollntoys Member

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    I have 2012 Taco with a 6 and it has an interment rough idle while sitting at stoplights. Usually in drive at a light it idles at 600rpm. For no reason it will bump up to 850rpm and I notice the truck slightly vibrating. Sometimes it will lurch forward as if someone barely taped my rear bumper. I thought it was normal but now it's starting to bug me. After the holidays I'll bring it in to get it checked out.
     
  4. Dec 18, 2012 at 10:24 AM
    #4
    97yota4wd

    97yota4wd Well-Known Member

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    caged, camburg long travel, 50t leafpack (soon to be installed) light rack over cab, 5pt harnesses etc
    motor mounts. but its present untill 15mph... weird.
     
  5. Dec 18, 2012 at 10:28 AM
    #5
    racer1x

    racer1x Well-Known Member

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    Too many
    When have the plugs been replaced?? I notice the same rough idle and pinging when I get gas from certain stations, I found a station that my truck likes and have been fueling there regularly.
     
  6. Dec 18, 2012 at 11:04 AM
    #6
    nathan3306

    nathan3306 Well-Known Member

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    Mine does that when the AC kicks in. Freakin hate it!

    Both my 05 and 12 have done the same thing. This V6 is no smooth running engine for sure.
     
  7. Dec 18, 2012 at 12:41 PM
    #7
    GoHuskers

    GoHuskers Well-Known Member

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    Same thing on my '12 sport v6. In park it is ok but slight vibration when stopped in drive. It has less than 3k miles.
     
  8. Dec 18, 2012 at 1:48 PM
    #8
    coyote70

    coyote70 New Member

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    I have a 2013 with 2800 miles that does exactly the same thing, was going to bring it up at my 5000 mi service
     
  9. Dec 18, 2012 at 2:34 PM
    #9
    Jimmyh

    Jimmyh Well-Known Member

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    If the K&N Filter is lubricated I would guess a dirty MAF Sensor.
     
  10. Dec 18, 2012 at 2:58 PM
    #10
    Good351

    Good351 Well-Known Member

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    Ya, any of you guys clean your MAF or Throttle Body? Every spring I clean the TB, and MAF and install a new set of plugs. Always runs smooth, even when the AC kicks in..
     
  11. Dec 18, 2012 at 3:38 PM
    #11
    lawless

    lawless Well-Known Member

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    my 2012 does it with 1,800 miles. a tad disconcerting but if they all do it and the trucks generally last forever it's no big deal to me. i mean, it could be a Chevy.
     
  12. Dec 18, 2012 at 3:46 PM
    #12
    jw1983

    jw1983 Well-Known Member

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    I had the same lurch in my 2011 DCLB. I was told that it was normal, I just got use to it. On my 2013 AC I don't have the same lurch.
     
  13. Dec 21, 2012 at 6:13 PM
    #13
    Shaowei

    Shaowei [OP] Well-Known Member

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    Thanks for all the input. I've performed a cursory inspection of the motor mounts and didn't notice anything. I'm planning on cleaning the MAF and throttle body to see what happens.

    Also, I have a new observation. I went to the open the hood when the motor was idling roughly so I put on the park brake and found out that the rough idle only happens when my foot is on the brake. No brake pedal + park brake equals no rough idle.

    I'll keep this thread updated as I learn more.
     
  14. Dec 21, 2012 at 8:30 PM
    #14
    Jimmyh

    Jimmyh Well-Known Member

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    Sounds like an issue with the vacuum brake booster...
     
  15. Dec 21, 2012 at 8:30 PM
    #15
    DR Da_da

    DR Da_da Infrequent Member

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    This is out of my ignorance of the truck's systems, but could there be a leak in the brake booster's vacuum system which, in turn, causes the engine to stumble?
     
  16. Dec 22, 2012 at 4:55 AM
    #16
    maineah

    maineah Well-Known Member

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    Vacuum leak or tight valve clearance.
     
  17. Dec 22, 2012 at 12:42 PM
    #17
    Shaowei

    Shaowei [OP] Well-Known Member

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    I hadn't thought about the brake system. Is a leak in the brake vacuum system something that I could diagnose at home or something better handled by a shop? Anything particular to look for?
     
  18. Dec 22, 2012 at 2:16 PM
    #18
    Vstrom30

    Vstrom30 Well-Known Member

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    If there was a leak in the vacuum booster, your pedal would most likely get rock hard and you would most likely have a CEL with lean codes.
     
  19. Dec 22, 2012 at 2:29 PM
    #19
    Jerez

    Jerez SoCal LED Dash Swap

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    Half LT dont count
    Mine does that when it's still warming up and sometimes at stop lights since almost new...never got around to figuring out what it was :notsure:
     
  20. Dec 22, 2012 at 3:14 PM
    #20
    Vstrom30

    Vstrom30 Well-Known Member

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    Mine seems to do it when the temperature drops outside. I never considered it a problem.
     
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