Trying to diagnose this acceleration problem.

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by dntboome, Aug 13, 2019 at 1:51 AM.

  1. dntboome

    dntboome New Member

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    Any ideas? It revs so loud while accelerating but evens out above 36 mph. New Prius owner here with no ideas.
     
  2. Lovec1990

    Lovec1990 Junior Member

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    One question did this appeared after you bought the car or did car already had this behavior?
     
  3. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    How's the fuel economy?

    A weak traction battery forces the hybrid system to use the gas engine more. During acceleration, "more" means higher RPM, which means more noise.

    This can happen if the battery is simply a bit low or too cold or too hot. If it's happening regularly, it is possible that the battery is worn out.
     
  4. ASRDogman

    ASRDogman Senior Member

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    Maybe it's the video/audio, but it didn't sound that loud. That is what mine sounds like.
    It's a little hard to hear over the podcasts though. :)
    If this is your first Prius, it will take time to learn and understand the different noises the car makes.
    It was pretty strange for me. I wasn't sure what was normal and what wasn't.
     
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  5. dntboome

    dntboome New Member

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    I was like that when i bought it.

    HSI seems to almost reach 50 mpg since i ve been driving it.


    that the strange thing I'm trying to rule out. I did replace spark plugs, and cabin and engine filter. To get a fresh start not sure where next to focus my attention.
     
    #5 dntboome, Aug 13, 2019 at 1:41 PM
    Last edited by a moderator: Aug 13, 2019 at 5:18 PM
  6. dntboome

    dntboome New Member

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    Ill post a new video. I also have Dr. Prius and ill post the readings from the battery. The battery seemed fine and no codes being thrown so I didn't suspect hybrid system.
     
  7. dntboome

    dntboome New Member

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    ignore this post to meet requirements.
     
  8. FuelMiser

    FuelMiser Active Member

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    Almost 50 MPG is very good for a Gen 3, especially a 2010. All Gen 3's are loud, very little sound insulation. The one thing you haven't mentioned is your tires. Make sure they are pumped up to 42 front/40 rear for best MPG. Also, they should be designed for low rolling resistance (LRR). The sidewall should say "Eco" or "Green" or have a leaf image on them for "green economy" tires. If they are worn (not much tread left), they will be louder.
     
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  9. bisco

    bisco cookie crumbler

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    how many miles on her? have you cleaned the egr circuit? changed the oil and filter?

    cleaned the throttle body? maf?

    have you read any of the egr/oil burning/oil catch can/blown head gasket threads?
     
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  10. dntboome

    dntboome New Member

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    170k no these are great places to research! this the type of tips I needed. ill do them one by one! Thank you!!!
     
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  11. CR94

    CR94 Senior Member

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    Any clear reason to believe there is anything amiss?
     
  12. bisco

    bisco cookie crumbler

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    only if the acceleration noise is much worse than normal
     
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