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wining noise

Discussion in 'Gen 2 Prius Main Forum' started by JPM199, Feb 10, 2013.

  1. JPM199

    JPM199 Junior Member

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    Developed a wineing type noise in my '07 prius engine compartment. Noise only there when gas pedal pressed. If I let off on gas the wining noise stops. Anyone else experience this?
     
    #1 JPM199, Feb 10, 2013
  2. nh7o

    nh7o Off grid since 1980

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    Need more specifics: What speeds, is the ICE running, or just electric power? How does the car drive? MPG?

    The inverter does make some high pitched noise when larger amounts of current flow through it, but it is normally hard to hear.

    To be more correct, in the Prius there is no gas pedal per se, since sometimes pressing it won't turn on the ICE. Accelerator pedal is better.
     
    #2 nh7o, Feb 10, 2013
  3. JPM199

    JPM199 Junior Member

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    Car drives just fine ---- current load of fuel at 52mpg. The whine noise is heard whenever you let off the accelerator at any speed. ICE is running when whine is heard.
     
    #3 JPM199, Feb 10, 2013
  4. nh7o

    nh7o Off grid since 1980

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    Confused now. Happens when stepping on pedal? Or letting off pedal? The two posts differ.
     
    #4 nh7o, Feb 10, 2013
  5. JPM199

    JPM199 Junior Member

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    Letting off pedal.
     
    #5 JPM199, Feb 10, 2013
  6. nh7o

    nh7o Off grid since 1980

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    OK. Does the pitch of the noise vary with speed? I.e higher frequency with higher speed?
     
    #6 nh7o, Feb 10, 2013
  7. edthefox5

    edthefox5 Senior Member

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    The engine is making the noise for sure. Put the car in inspection mode and the engine will run without you being in the car. Get a flashlight and open the hood and see where the noise is coming from. Items of interest are the engine water pump and the belt area. If whining in the front of the motor shut the engine off and look for green specks in that area indicating coolant seepage from the water pump weep hole usually indicating a bad pump. Check engine oil too.

     
    #7 edthefox5, Feb 10, 2013
  8. nh7o

    nh7o Off grid since 1980

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    I'm not convinced yet. If the car is warmed up, and the going less than 42 mph, then letting off of the accelerator pedal will cause the engine to turn off, zero rpms, and regenerative braking will occur. If going over 42 mph, the engine will freewheel at some speed, and also regen braking occurs. Since the OP says the noise happens when letting off the pedal at any speed, I would tend to think this has something to do with regen braking. That's why I am curious if the pitch of the noise changes with speed.

    Also, the OP could say what the mileage of the car is. Did the noise just appear one day, or come on gradually?
     
    #8 nh7o, Feb 11, 2013
  9. usnavystgc

    usnavystgc Die Hard DIYer and Ebike enthusiast.

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    Well, I've never hear wine make a noise before (unless you pour it) so the OP must have meant "whining" noise
     
    #9 usnavystgc, Feb 11, 2013
  10. JPM199

    JPM199 Junior Member

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    Missed letter when spelling whine. That happens sometimes when using smartphone keypad.
     
    #10 JPM199, Feb 13, 2013
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