1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Thump - Thump - Thump

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by yeldogt, Jul 15, 2012.

  1. yeldogt

    yeldogt Active Member

    Joined:
    Jan 20, 2012
    810
    313
    0
    Location:
    NE
    Vehicle:
    2011 Prius
    Model:
    Five
    Was standing in the driveway when someone was leaving in the Prius -- All of a sudden three or four thumps -- I guess when the ICE started -- sounded just like a slapping belt ... but no belts correct? ...... this was loud.

    Any ideas?

    We shut it off and restarted -- AC on and off ...... nothing ......... car ran fine on a trip of about 200 miles -- never another sound? I'm going to start it this evening -- it has been sitting since Friday evening -- not sure what to look for.

    This did not sound like any kind of valve noise -- nothing squealing.
     
    #1 yeldogt, Jul 15, 2012
  2. spiderman

    spiderman wretched

    Joined:
    Jul 5, 2009
    7,543
    1,558
    0
    Location:
    Alaska
    Vehicle:
    2010 Prius
    Model:
    II
    Welcome to the knock-club. Sounds like the intake manifold condensation problem.
     
    #2 spiderman, Jul 15, 2012
  3. co_prius_3

    co_prius_3 Member

    Joined:
    Aug 7, 2011
    174
    32
    0
    Location:
    Colorado, USA
    Vehicle:
    2011 Prius
    Model:
    Two
    That's surprising. It usually happens for most people in cold weather. What was the outside temperature?
     
    #3 co_prius_3, Jul 15, 2012
  4. spiderman

    spiderman wretched

    Joined:
    Jul 5, 2009
    7,543
    1,558
    0
    Location:
    Alaska
    Vehicle:
    2010 Prius
    Model:
    II
    That does not seem to be the case... people have had it happen in all kinds of temps. I suspect high humidity conditions.
     
    #4 spiderman, Jul 15, 2012
  5. yeldogt

    yeldogt Active Member

    Joined:
    Jan 20, 2012
    810
    313
    0
    Location:
    NE
    Vehicle:
    2011 Prius
    Model:
    Five
    It has been very hot - not overly humid -- car was sitting since the day before ........this start was about 1pm in the afternoon.


    I certainly have spotted posts regarding the knock problem -- This is a late 2011 -- I believe it was a November build ......... I thought they fixed the problem earlier.

    If this is what it is I understand why people get concerned.
     
    #5 yeldogt, Jul 15, 2012
  6. Jonny Zero

    Jonny Zero Giggidy

    Joined:
    Jun 22, 2012
    1,388
    351
    0
    Location:
    Austin, TX
    Vehicle:
    2012 Prius
    Model:
    Five
    You sure it wasn't the ABS, VSC, TRCT doing a self check?
     
    #6 Jonny Zero, Jul 15, 2012
  7. yeldogt

    yeldogt Active Member

    Joined:
    Jan 20, 2012
    810
    313
    0
    Location:
    NE
    Vehicle:
    2011 Prius
    Model:
    Five
    I'm not sure what it was -- but I've never heard a notice like that on other cars with those systems. It is now due for the 10k service -- So I will mention it ... I'm hoping it will do it again.
     
    #7 yeldogt, Jul 15, 2012
  8. co_prius_3

    co_prius_3 Member

    Joined:
    Aug 7, 2011
    174
    32
    0
    Location:
    Colorado, USA
    Vehicle:
    2011 Prius
    Model:
    Two
    The only time I got knocking is when the outside temp was at or below freezing. Of course, Colorado is much lower humidity than other parts of the country.
     
    #8 co_prius_3, Jul 15, 2012
(You must log in or sign up to post here.)