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Car in neutral while running

Discussion in 'Gen 2 Prius Technical Discussion' started by DWJM2513, Jan 12, 2019.

  1. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    You are paying all the bills here?

    Everyone is trying to help. Some are more trying than others. If you can't take the heat, it is time to move on. I doubt you can find a kinder gentler way to the truth, but you are welcome to go try.
     
  2. bisco

    bisco cookie crumbler

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    Prius was engineered to start and stop the engine thousands of times a day.
    You’re overthinking this
     
  3. DWJM2513

    DWJM2513 Junior Member

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    Yeah and I'm glad for the people that are HELPING me. Not people like skibob coming onto my post and basically telling me I'm a know it all and thinking I'm gonna immediately do the opposite thing that everyone is telling me and those kind of people are the ones that aren't helping whatsoever
     
  4. DWJM2513

    DWJM2513 Junior Member

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    The lurch I was curious about when I started noticing it so I went on a forum and everywhere I looked said a little lurch when the engine started up was normal for a prius but my question is to what extent is it normal?
     
  5. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    I'm a little new to the Prius and this site, but I'd encourage you to keep reading and hang tight- there are a lot of really smart members here and there's a lot to learn about these electromechanical wonders. I'll also mention that the site has an 'ignore this member' function. I have learned that the site is much more enjoyable once you figure out whom to filter out.

    Lurching onward... (sorry)

    The lurch is hard to quantify. I certainly feel a momentary vibration for about 0.5 seconds when the engine is being started. However, I have never felt the car move or change its current movement when the engine starts. If I was at a standstill in P, an engine start causes no forward or reverse movement whatsoever, whether my foot is on the brake or not. And when I am rolling in D, I can sometimes perceive the "bump" of the engine start, but there is no perceptible change in my forward speed.
     
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  6. WilDavis

    WilDavis Senior Member

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    I look forward to the little "lurch" - to me, it's ChuggyPig saying, "…all is well, I guess I'd better wake up and start doing what I'm paid for!" , which is (IMNSHO) far better than the eerie silence of nothing, no "clicks", "whirrs", "hisses"or "clangs". You pays your money, you takes your choice, I guess! ;)
     
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  7. Prodigyplace

    Prodigyplace Senior Member

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    When my son had his 2005 Prius it had a normal lurch when the engine started.
    His 2015 Prius v was much better and I think my 2017 Prius is even smoother when starting the engine.
     
  8. Mendel Leisk

    Mendel Leisk Senior Member

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    You rang?

    upload_2019-1-14_12-3-35.png
     
  9. Prodigyplace

    Prodigyplace Senior Member

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  10. sam spade 2

    sam spade 2 Senior Member

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    Are you always this dense and argumentative.......or are you putting on a show just for US ??
     
  11. dolj

    dolj Senior Member

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    If the lurch, which is normal and harmless when only using “P”, worries you, apply the foot operated parking brake (erroneously IMNSHO called the emergency brake in the US).

    The mechanical (foot operated) parking brake should be applied at all times the car is stationary and especially if unattended, even though it seems that only using the transmission lock (“P”) is default behaviour in the US.
     
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  12. ChapmanF

    ChapmanF Senior Member

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    If I'm sitting in Park in my Gen 3, I always know about a half second in advance when the engine's going to start, when I hear the hydraulic brakes self-apply to keep the car from lurching.

    It's a nice touch. My Gen 1 didn't do it, so there was always a little lurch. Maybe Gen 2 as well. Never hurt anything.
     
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  13. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    A few thoughts on this-

    1. Maybe @DWJM2513 just needs a bit of brake work?
    2. I haven't noticed the hydraulic brakes doing this in my c, but then it is new and my hearing isn't.
    3. I'm really curious why Toyota would do it that way. In another discussion, I had wondered if engine start wasn't just MG1 acting, but rather a combination of opposite actions by MG1 and MG2. If I have it right that would balance the torque on the power split device so the engine starts with zero impact to vehicle speed.
     
  14. DWJM2513

    DWJM2513 Junior Member

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    I do have the abs vsc and ((b)) symbol on the dash but I know exactly what it is and it's nothing to do with the hyd brakes. It's the ring on the axle that's messing with the abs sensor
     
  15. JC91006

    JC91006 Senior Member

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    Gen 2 doesn't do that, it lurches
     
  16. ChapmanF

    ChapmanF Senior Member

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    That was the idea (I think it's even discussed in The Prius That Shook the World).

    Apparently, getting it perfect has been challenging enough that, by the time Gen 3 rolled around, they said "hey, we've got computer-controlled brakes here, right?"
     
  17. jerrymildred

    jerrymildred Senior Member

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    I believe the lurch is just physics. I had a neighbor when we live in rural Ohio who had a P-51 Mustang. He said you do NOT want to slam the throttle wide open when you're close to the ground or you may hit the ground with a wingtip. North-south crankshafts do that. Side-to-side ones make a front-to-back reaction. It might bump the parking pawl, but that's what it's there for.
     
  18. Prodigyplace

    Prodigyplace Senior Member

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    BTW. if I am driving east, I have a North-South crankshaft ;)
     
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