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2010 150k mileage dropping to 25MPG Help.

Discussion in 'Gen 3 Prius Main Forum' started by MarsMan, Mar 30, 2021.

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  1. MarsMan

    MarsMan Junior Member

    Joined:
    Sep 3, 2015
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    Location:
    Torrance, Ca
    Vehicle:
    2010 Prius
    Model:
    III
    Yeah did that when swapping plugs, all pressures normal. I was going to do my head gasket if low, or I saw a clean piston, everything looked good though. I was hesitant to pull the head, I havent done one on a prius. Figured it would take me a couple days.
     
    #21 MarsMan, Apr 5, 2021
  2. abubin

    abubin Member

    Joined:
    Dec 7, 2019
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    Location:
    Malaysia
    Vehicle:
    2012 Prius
    Model:
    N/A
    Sorry if this is a lousy question, did you open the throttle body flap when you were cleaning it? Check the butterfly flap to make sure it is not out of position.

    Also, try using hybrid assistant. Instead of doing things randomly, this can monitor all the related temps including MG1 & MG2. So you will know if it is temp issue or not.
     
    #22 abubin, Apr 6, 2021
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