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

Strange rattle sound on idle

Discussion in 'Gen 2 Prius Technical Discussion' started by Alexano, Jun 9, 2019.

  1. Alexano

    Alexano Junior Member

    Joined:
    Mar 12, 2019
    18
    1
    0
    Location:
    Mars
    Vehicle:
    2007 Prius
    Model:
    N/A


    I am facing strange rattle sound on idle. Please see video.



    Sometimes that sound become too louder that everyone can notice it from way too long.

    When i put car in parking or change gear lever to D, that sound stops. I think it is knocking of engine but not sure.

    Note: using hi-octain reduce that sound but not completely turn it off. And this sound become more louder when engine is charging batteries.

    Can anybody suggest how to get rid of this?
     
    #1 Alexano, Jun 9, 2019
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    108,038
    49,114
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    how many miles on her?

    can't get the video to play
     
    #2 bisco, Jun 9, 2019
  3. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    10,096
    4,795
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    odd that it goes away when in gear. never seen that before on here. Sounds really bad though.
     
    #3 edthefox5, Jun 11, 2019
  4. landspeed

    landspeed Active Member

    Joined:
    Feb 25, 2007
    351
    198
    0
    It sounds bad. If it is engine it is the top end. Probably. Is the oil level OK?

    The fact that octane of fuel reduces it is odd and suggests a problem with air fuel ratio somewhere for some reason. Which could include random things like valves not fully opening or closing.

    I would be tempted to remove the valve cover and see what, is going on with the timing chain, cams, lifters, valves. That sound is loud enough that something is close to catastrophic failure and early intervention could save the car.

    Finally, is the gearbox oil ok and did the car have issues with charging the battery as might happen if something is dodgy in the transmission?

    I would be tempted to do engine oil change and use a magnet for metal fragments, then transmission. But check the top, under the valve cover, and the timing chain first...
     
    #4 landspeed, Jun 24, 2019
(You must log in or sign up to post here.)