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high rpm's

Discussion in 'Technical Chat' started by TXpro4X4, Jun 1, 2012.

  1. Jun 1, 2012 at 1:52 PM
    #1
    TXpro4X4

    TXpro4X4 [OP] Well-Known Member

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    My 2011 rpm's stay at 1200 while moving in neutral. Like a high idle or something. Anyone have an explanation? No cold air, just trd exhaust. 6 speed manual trans.
     
  2. Jun 2, 2012 at 12:39 PM
    #2
    TXpro4X4

    TXpro4X4 [OP] Well-Known Member

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    Can anyone help??????
     
  3. Jun 2, 2012 at 1:52 PM
    #3
    TXpro4X4

    TXpro4X4 [OP] Well-Known Member

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    Naw when coming to stop light. Even sometimes kicks up a little more than that its the weirdist thing.didnt happen in my 05.
     
  4. Jun 3, 2012 at 8:32 AM
    #4
    TXpro4X4

    TXpro4X4 [OP] Well-Known Member

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    No, i know what you are talking about too.
     
  5. Jun 3, 2012 at 8:35 AM
    #5
    memario1214

    memario1214 Vivid Illumination Vendor

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    Yeah, I gots boost
    Pretty sure mine's at 12 like all the time. I'll have to take a look later.
     
  6. Jun 3, 2012 at 8:36 AM
    #6
    VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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    I always roll gears coming up to a light or coasting, your fuel injectors shut off when you are moving via momentum in gear.

    Throwing into neutral at any point when the vehicle is in movement doesn't make sense to me.
     
  7. Jun 3, 2012 at 8:42 AM
    #7
    Blackcat10

    Blackcat10 Well-Known Member

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    Dirty or bad IAC valve. (Idle Air Control Valve) Could also be a vacumn leak.
     
  8. Jun 4, 2012 at 12:03 AM
    #8
    boshak

    boshak Well-Known Member

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    x2. What's your true idle when the truck is stopped.
     
  9. Jun 4, 2012 at 12:06 AM
    #9
    BuzzardsGottaEat

    BuzzardsGottaEat "Pick up some speed.. You'll make it."

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    All the time, or only short trips?

    Did you disconnect the battery recently?
     
  10. Jun 4, 2012 at 12:49 AM
    #10
    650H1

    650H1 Well-Known Member

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    that is strange, mine idles around 600 rpms in neutral, park, or stopped in drive.... once its warmed up A/C or not.
     
  11. Jun 4, 2012 at 10:45 AM
    #11
    BuzzardsGottaEat

    BuzzardsGottaEat "Pick up some speed.. You'll make it."

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    I'm wondering if it's just short trips to work, engine is still warming up?
     
  12. Jun 4, 2012 at 10:48 AM
    #12
    arrrghhh

    arrrghhh Well-Known Member

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    I've noticed mine does this as well. Only when in neutral and rolling. As soon as I come to a stop it settles back down.

    Never really bothered me, I figured it was just part of the vehicle. My '96 Maxima does this too...

    If the RPM's truly were high, it would worry me. But 1200? Meh. If it's idling at 3k, then start worrying :p
     
  13. Jun 4, 2012 at 3:30 PM
    #13
    DevL

    DevL Well-Known Member

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    Under 1500 rpm you fuel kicks back on to keep engine from stalling.
     
  14. Jun 19, 2012 at 8:45 PM
    #14
    lynnchpin

    lynnchpin YOTACO

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    I have the exact same issue. I just can't accept the idea of anti-stalling as the reason to idle so high when 900RPM is normal...300RPM is a considerable difference. There must be a way to program that out
     
  15. Jun 20, 2012 at 5:25 AM
    #15
    Rupp1

    Rupp1 Well-Known Member

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    If I put the clutch in while rolling, it does the same thing. It hangs around 12-1300, and near 5mph, it settles down to normal. I assume there is a reason.
     
  16. Jun 21, 2012 at 5:32 AM
    #16
    lynnchpin

    lynnchpin YOTACO

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    So am I wrong for thinking that coasting in neutral has any effect on saving fuel?
     
  17. Jun 21, 2012 at 6:40 AM
    #17
    VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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    My idle is around 600 or 700. Obviously it's a little higher when the Air Conditioning is pampering my handsome face with cold goodness.
     
  18. Jun 21, 2012 at 5:13 PM
    #18
    lynnchpin

    lynnchpin YOTACO

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    Thanks, I appreciate you removing that fallacy from my brain. I'll use it on the next tank and tally the results.
     
  19. Jun 22, 2012 at 10:38 AM
    #19
    iroh

    iroh Well-Known Member

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    There are select situations when coasting in neutral can save a little fuel, even with the 1200 rpm idle. Examples:
    -if the grade is such that the vehicle keeps about the same speed when coasting, and the engine isn't doing anything to push the vehicle, it takes less fuel to run the engine at idle speed than at in-gear speed
    -if driving through a descending speed limit sequence (i.e. 55-45-35-25), it's sometimes possible to time the coasting of the vehicle with the changing speed limits

    Know your local laws, coasting down a hill is often illegal (throwback to the days of easily-faded brakes).

    A rule of thumb I use, use DFCO whenever possible. The truck has so much momentum it takes a long time for the engine braking to slow it down. I'd really rare when I can take advantage of either of the above. More often, since air resistance is so significant with a truck, and the idle is so high, the speeds that coasting usually most benefits mileage (25-45) often are better done with the truck put into 6th gear. Either the difference in fuel consumption is similar or, at the lower speeds, even less because 6th gear will force the engine under 1200 rpm.

    Remember (at least on the manual tranny) you don't get fuel cut unless you let off the gas pedal with the engine running at least 1600 rpm. If you're spinning slower than that before you let off the pedal, you're burning gas. Once enabled it'll stay cut off down to 1200. If you tap the gas while it's cut and the engine is spinning between 1200 and 1600, gas still flows after you let off the pedal again.
     
  20. Aug 23, 2012 at 6:27 AM
    #20
    TXpro4X4

    TXpro4X4 [OP] Well-Known Member

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    Things & Stuff Front emblem led lighting. Under front bumper led rock lighting. Center counsel c.b mod with under the hood p.a Anytime foglight mod R.G.B tape light for inside toekick lighting. Front and back. CJumpers 700 lumens LED reverse lights. Front weathertech floor mats. De-Baged except TOY on tailgate. FJ style 6 speed shifter knob. Rubber tacoma bed mat. Trd exhaust. Trd 16in beadlocker style wheels Electrical a/c 115volt plug/usb mod next to passenger knee 5100's all the way around front set at .85
    No real answers from anyone, :-( god danm it fucken Toyota. My last taco I loved. Logiclly it fees like something is wrong. And im also getting 240-260 per tank of gas. My real concern for this is extra engine ware! Wtf they cant give back miles. Oh yhea danm thing runs better with the a/c going.
     
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