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2007 erratic idle issues

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by rrey, Jan 18, 2018.

  1. rrey

    rrey Junior Member

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    new to the forums as well as the hybrid community. I recently purchased a 2007 Prius with around 170k miles. When I test drove the vehicle it drove fine. It sat in my driveway a few weeks and when I recently drove it, it would raise the rpms up in idle to around 2500-3k. If you apply gas to the pedal it will smooth out temporairly, then die, then start the process all over again. If I take it out on the road anything below about 20mph the car will continue to rev the gas engine up. I'm not sure of the maintenance history of the vehicle and also replaced the MAF as I found the original one full of dirt. It is not throwing any OBD II codes except the (!) Yellow indicator on the dash. The car also sometimes gets confused as to whether it's in park or not when trying to shift to drive while the car is idling this way. I apologize in advance if this is not the correct forum but I've looked all over and can't seem to find an answer. Thanks for any responses and help.
     
    #1 rrey, Jan 18, 2018
  2. SFO

    SFO Senior Member

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    Welcome to PriusChat!!

    When cleaning or replacing the MAF sensor you must also disconnect the 12v battery for a few minutes before driving.

    Never let your Prius sit for such a long period of time, sure way to drain one or both batteries (or worse).
     
    #2 SFO, Jan 18, 2018
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  3. valde3

    valde3 Senior Member

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    If that does not help clean the throttle plate and then reset it.
     
    #3 valde3, Jan 18, 2018
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  4. rrey

    rrey Junior Member

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    Thanks, I'll definitely disconnect the battery for a few minutes and try and keep the batteries charged on this car. I'll also look at the throttle plate. What does "resetting" it involve?
     
    #4 rrey, Jan 18, 2018
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  5. fotomoto

    fotomoto Senior Member

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    Reset means disconnect the 12v. That clears the computers (ECU's) that both read the sensors and control the throttle (and a million other things).
     
    #5 fotomoto, Jan 18, 2018
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  6. rrey

    rrey Junior Member

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    Awesome, will definitely do. I thought he was talking about physically "resetting" the throttle plate itself. I'll post back later with results
     
    #6 rrey, Jan 18, 2018
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  7. edthefox5

    edthefox5 Senior Member

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    I suspect the hybrid battery is beginning to eventually fail. Only because now every other post is about a failing g2 battery,

    It cannot be a bad engine issue or it would throw a dtc on the dash. Watch the battery monitor closely on the mfd during your troubles you will probably see it spends a lot of its life in purple bars. When the hybrid battery
    Cannot supply enough power to meet your demands it falls to the engine which means a lot of reving.
     
    #7 edthefox5, Jan 18, 2018
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  8. rrey

    rrey Junior Member

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    UPDATE: Disconnected the 12V battery, changed the plugs and PCV Valve. Seems to be running smoother but still reving at low rpm. I did notice that the motor only does this when the hybrid battery is showing 8 or 7 bars. I've read elsewhere that this may be the motor trying to spin off an access charge? Does that sound correct, if not any more ideas?
     
    #8 rrey, Jan 20, 2018
  9. JC91006

    JC91006 Senior Member

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    Have you tried cleaning the throttle body?
     
    #9 JC91006, Jan 20, 2018
  10. rrey

    rrey Junior Member

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    Just the throttle plate itself, is there any other components I need to clean/inspect?
     
    #10 rrey, Jan 20, 2018
  11. JC91006

    JC91006 Senior Member

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    You can open up the plate and clean the throttle body.

    How did the throttle plate look when you cleaned it?
     
    #11 JC91006, Jan 20, 2018
  12. rrey

    rrey Junior Member

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    Ok thanks for the info, the throttle plate had slight build up but nothing significant.
     
    #12 rrey, Jan 20, 2018
  13. JC91006

    JC91006 Senior Member

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    Hmmm, then this cleaning probably won't help much. But it's so easy, try it and see. Disconnect the 12v for a minute when you are done
     
    #13 JC91006, Jan 20, 2018
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