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Looking for help. Happy owner,but concerned about future

Discussion in 'Gen 2 Prius Technical Discussion' started by rmacguy1949, Jun 16, 2013.

  1. rmacguy1949

    rmacguy1949 Junior Member

    Joined:
    Sep 14, 2009
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    Location:
    arizona
    Vehicle:
    2008 Prius
    Model:
    N/A
    Need advise please:

    original owner 2008 Pack 2 Prius. Not driven for 11 months between 2008 and 2012.

    at 135,000 miles MPG was 52.7. Pretty constant over total mileage.

    Haven't changed driving pattern or habits.
    Did change 2 things at 135,000 miles.

    1. Got a 4 wheel alignment (thought it was time)
    2. Put new set of Goodyear Integrity Tires on.
    (I know lots of bad press but I have used 3 sets of these and 1 set of Michelin,
    with better results from Goodyear.) Back pressure 40, front pressure 38.
    I always loose about 1.5 mpg for the first 10K but then back to normal.

    Car now has 145,000 and MPG's down to 48.5. (Now down to 48.4 after 1,500 more miles.)

    I have had the Inverter coolant changed.

    I have checked my 12Volt battery 2 ways(with meter and MFD display) and it appears o.k.

    12.63 volt at jump point after 24hrs idle. 12.23Volt at jump point after 24hrs idle and car
    with air on.

    I have questioned my service rep about throtle body cleaning and he informs me
    that they do injector cleaning. In the past I have had bad luck with injector chemicals
    with O2 sensors. Is there anything else I should try before this?

    Can I read the MAF with a SCANGUAGEII?

    any help would really be appreciated

    Thanks very much in advance

    Richard
     
    #1 rmacguy1949, Jun 16, 2013
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

    Joined:
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    Location:
    Green Valley, AZ
    Vehicle:
    2015 Prius
    Model:
    Two
    Did you replace the iridium spark plugs at 120K miles? If not I suggest that should be done now.

    You might also clean the mass air flow sensor.

    Many Prius owners would be happy with 48 mpg average, so I don't think your car has a serious issue.
     
    #2 Patrick Wong, Jun 16, 2013
  3. ItsNotAboutTheMoney

    ItsNotAboutTheMoney EditProfOptInfoCustomUser Title

    Joined:
    Jul 18, 2009
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    Location:
    Maine
    Vehicle:
    2010 Prius
    Model:
    II
    OP, are the mpgs you quoted lifetime averages or something else?
     
    #3 ItsNotAboutTheMoney, Jun 16, 2013
  4. jhinsc

    jhinsc Senior Member

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    Why do run 2 lbs higher on rear tires vs front? More weight in front - unless you're carrying a heavy load?
     
    #4 jhinsc, Jun 16, 2013
    richard schumacher likes this.
  5. 2009Prius

    2009Prius A Wimpy DIYer

    Joined:
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    Location:
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    Vehicle:
    2009 Prius
    New tires will definitely lower the MPG due to higher road resistance.

    Alignment may change the MPG (tradeoff between stability and low resistance).

    It looks like the car is working fine. I won't worry about it if it's my car. Good luck!
     
    #5 2009Prius, Jun 18, 2013
    HaroldW likes this.
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