violent shaking at start up

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by springfield, Nov 15, 2009.

  1. springfield

    springfield New Member

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    I pressed the start button this morning and the car shook violently, rocking from side to side for about five seconds. Then the engine started and the shaking stopped. Temperature about 45 degrees.
    What's this about? Is this what will happen as it gets colder in the winter? Anyone else experience this?
    This car is continuing to disappoint me. 6k miles.
     
  2. qbee42

    qbee42 My other car is a boat

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    Several other owners have posted about this, so yes, it has happened to others. So far the cause remains unknown.

    Search is a useful feature.

    Tom
     
  3. Patrick Wong

    Patrick Wong DIY Enthusiast

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    It sounds like you've got a conflict between the gasoline engine and MG1. When the hybrid vehicle ECU is starting up the engine, MG1 serves as a starter motor to spin up the engine. Once the engine starts then MG1 should continue to spin at an appropriate RPM so that the engine can idle.

    Since you're experiencing this severe vibration, it appears that MG1 is not spinning at an appropriate speed, hence it is fighting the engine.

    This happened once in a while with my 2001, when coming to a stop. It seemed that disconnecting the 12V battery to reset the ECUs helped. I did not notice this problem at all with my 2004.

    Suggest that you document the problem with a video camera, next time it happens, so that you have evidence to provide your dealer. (I assume that no warning lights have appeared.) However, until a TSB is issued its unlikely that they'll be able to do much for you as a permanent fix would require new firmware for the hybrid vehicle ECU.

    As an early adopter of the 3G Prius, I'm sure that you'll notice occasional glitches from time to time.
     
  4. paprius4030

    paprius4030 My first Prius

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    This has happened to me once with my 08 when it was pretty new. Never happened again, I just chalked it up to, one of those things. Sorry to hear your Prius continues to dissapoint you. Why do you say that?
     
  5. springfield

    springfield New Member

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    Because ever since 5k miles my cars interior creaks and rattles over every subtle bump in the road. Like many others on this post (see rattles and creaks) I have found my car poorly constructed with brittle plastic components that have little body integrity. I have never owned a car that has disappointed as much as this 2010 Prius. I understand it's a special hi-tech car and it looks great in and out, but the daily rattles, creaks and now shaking at start up just confirms my opinion. Never buy a newly redesigned model the first year.
     
  6. tumbleweed

    tumbleweed Senior Member

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  7. springfield

    springfield New Member

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    thanks for your response. my concern is this happening more frequently as the temps drop. This can't be good for the engine/system for the long haul. :(
     
  8. qbee42

    qbee42 My other car is a boat

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  9. spiderman

    spiderman wretched

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    I'll just say real quick that it happened to me once this summer. It has not happen since and yesterday it was 0 degrees here. I don't think cold temps have anything to do with it but that is just my opinion.

    Peter
     
  10. a64pilot

    a64pilot Active Member

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    The one thing that seems consistent is short engine runs and then on later re-start it occurs. Maybe we have found a real use for EV mode?
     
  11. Bobsprius

    Bobsprius BobPrius

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    Was this your First start of the day or had you run the car before this rough start occurred? :confused:
     
  12. EZW1

    EZW1 Active Member

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    I got the shake the other day but under different circumstances. It so happened that it was morning and I turned the car on, put it in reverse, backed-up and put it in neutral at the exact same time the engine was starting up. Neutral won out and the engine went immediately back off again and the car shook when this happend. Even more strange, as I put it in drive to go forward, I was able to stay in stealth mode and the engine never started up again. This was a cold engine!! It should've started as I drove forward under power but it didn't. Thinking I might've broke something or blew the electronics mind, I parked it, shut it off completely, waited a few seconds, then turned it back on again to find the ICE starting up normally and the car drove fine.
     
  13. qbee42

    qbee42 My other car is a boat

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    Is this a 2009 Prius as shown in your profile? If so, note that this thread relates to the 2010 Prius. The Gen II Prius don't suffer from the same startup shakes as the Gen III, so it might be similar but not the same problem.

    Tom
     
  14. bwilson4web

    bwilson4web i3 and Prime

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    The hybrid transaxle motors play a part in both starting and stopping the engine. By shifting into neutral, they can't finish their part and that leads to hearing and feeling rough engine operation. Keep it in gear a bit longer and life should be good. But since you have a 1.5L engine, you might consider cleaning the throttle area.

    Bob Wilson
     
  15. EZW1

    EZW1 Active Member

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    Thanks qbee... I knew this was the 2010 area but just wanted to comment on the thread with a similar experience. Or because I own a GenII I'm banned from posting here? Hope not.
     
  16. qbee42

    qbee42 My other car is a boat

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    Not a problem. I just wanted to make sure that you and other readers realized that these were unrelated issues. Granted, they both involve rough engine starting, but the root cause is not at all the same.

    Tom
     
  17. EZW1

    EZW1 Active Member

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    Sure. I appreciate your candor.
     
  18. springfield

    springfield New Member

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    yes, first start of the day.
     
  19. Bobsprius

    Bobsprius BobPrius

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    This definitely appears to be related to short cycle running of the ICE.

    I don't really think it's an issue but what I do is at least let it run until the first shut off, and I have not experienced it when doing that.

    It's only a matter of a minute or so...so worth a try to see if that helps eliminate the recurrence. ;)
     
  20. spiderman

    spiderman wretched

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    It will be interesting if this issue pops up after say 10,000+ miles. Perhaps the system just needs to loosen up?
     
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