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2009 Prius 2nd gen roars at any speed

Discussion in 'Gen 2 Prius Technical Discussion' started by John Burden, Dec 24, 2018.

  1. John Burden

    John Burden New Member

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    ----USA----
    I bought a used 2009 Prius from a family member. Car roars at all speeds. I have changed both wheel bearings and both cv shafts and it still does it Help!
     
    #1 John Burden, Dec 24, 2018
  2. Raytheeagle

    Raytheeagle Senior Member

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    Welcome to Prius Chat (y).

    Some questions:

    • How many miles on your Prius?
    • How long have you had it?
    • What is your mpg?
    • What does the hybrid battery state of charge donwhile the car is roaring?
    • Does it stay at the same pitch or does the pitch change?
    • How’s the engine oil level?
    Good luck and happy holidays(y).
     
    #2 Raytheeagle, Dec 24, 2018
  3. JC91006

    JC91006 Senior Member

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    Check your tires for uneven wear
     
    #3 JC91006, Dec 24, 2018
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  4. sam spade 2

    sam spade 2 Senior Member

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    +1
    Since he seems to think the noise is coming from that general area.

    Some brands/models of tires have noisy tread patterns too.
    Think off-road truck tires......only not quite as bad.

    And another wild idea:
    Does the noise only occur when the gas engine is running ??
    Like maybe the previous owner messed with the intake system.
     
    #4 sam spade 2, Dec 25, 2018
    Mendel Leisk likes this.
  5. edthefox5

    edthefox5 Senior Member

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    it’s not a quiet car. And it’s all tire.

    Try deflating all the tires substantially like to 22 lbs as a test and see if the noise characteristic changes.

    Keep in mind if your running LRR tires they have much harder rubber and when get old are really really noisey.
    Hopefully your not running Goodyear Integrities they are the worlds worst tire imho. Hard as a rock.

    What kind of tire are you running.
     
    #5 edthefox5, Dec 25, 2018
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  6. sam spade 2

    sam spade 2 Senior Member

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    BUT don't leave them like that for very long.
    LOW pressure is a good way to KILL tires.
     
    #6 sam spade 2, Dec 26, 2018
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