1. Attachments are working again! Check out this thread for more details and to report any other bugs.

my first post changed out MAF sensor

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by mechanic michael, Aug 19, 2018.

  1. mechanic michael

    mechanic michael New Member

    Joined:
    Aug 19, 2018
    27
    3
    0
    Location:
    hesperia ca
    Vehicle:
    2004 Prius
    Model:
    II
    My first post hi to all ..I Bought this prius a month ago looks extremely well cared for has new oil and hv battery former owner did lots of upkeep . I assumed former owner had cleaned the mass air flow sensor ..i Was wrong this was a mess black oil caked on original MAF sensor from 2004 and 129k miles never cleaned nor replaced OMG... The car was running OK other than the slight rough idle and my mpg meter was reading 42 over the last five tanks and month of driving.. Just installed a new denso oem sensor today ,its almost like I have a new car much better torque low end response ..i Would love to see 50 + average on my mpg display.. I will make an update in a few weeks with real numbers.
     
    #1 mechanic michael, Aug 19, 2018
    Naurill and bisco like this.
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    107,693
    48,945
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    congrats and welcome, all the best!(y)
     
    #2 bisco, Aug 21, 2018
  3. mechanic michael

    mechanic michael New Member

    Joined:
    Aug 19, 2018
    27
    3
    0
    Location:
    hesperia ca
    Vehicle:
    2004 Prius
    Model:
    II
    ..power went up slightly with the new maf sensor ..mpg not much maybe 2 mpg better.
     
    #3 mechanic michael, Aug 26, 2018
  4. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    54,662
    38,207
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Where would the black oil coming from? PCV system?
     
    #4 Mendel Leisk, Aug 26, 2018
  5. Naurill

    Naurill Junior Member

    Joined:
    Feb 26, 2017
    59
    25
    0
    Location:
    United Kingdom
    Vehicle:
    2007 Prius
    Model:
    N/A
    Top tip: if you want to save a few more bucks, look at the hazard data sheet(s) for the recommended (branded) cleaner and then use the generic equivalent (e.g. white spirit for the mass flow sensor or acetone for the throttle body).
     
    #5 Naurill, Aug 26, 2018
    Last edited: Aug 27, 2018
  6. mechanic michael

    mechanic michael New Member

    Joined:
    Aug 19, 2018
    27
    3
    0
    Location:
    hesperia ca
    Vehicle:
    2004 Prius
    Model:
    II
    maybe at one time the pcv or just 130k miles of los angeles air.

    not a big deal there on ebay retail lexus toyota denso 21 dollars free shipping

    i only have a overall 44 mpg ...No mechanical problems no oil leeks..... unless the air fuel ratio sensor is getting slow ..really Want to get this figured out I am a experienced ECO driver ... tires are good motor is good ,hv and 12v battery are good ..plugs Changed a 1000 miles ago with ik16 denso.
     
    #6 mechanic michael, Aug 26, 2018
    Last edited by a moderator: Aug 26, 2018
(You must log in or sign up to post here.)