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Transmission Fluid and Engine Shaking Questions

Discussion in 'Gen 2 Prius Main Forum' started by GeorgeMW, May 16, 2018.

  1. GeorgeMW

    GeorgeMW Junior Member

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    Hello, guys, i need some tips from you, i have a gen 2, '06 prius, it has a little over 85k miles,
    firstly, should i change the transmission fluid? (I am pretty sure the fluid hasnt been changed as of yet).
    secondly, the temperature in my country is approx. 85 degrees Fahrenheit, the car has 45 mpg at this temperature, plus when the gas engine turns on or off, it has some "tremors", do you think the problem lies with the spark plugs, and should i change them?
    p.s. there are no warning lights on the dashboard.
    p.s. (2) thanks for your attention in advance
     
    #1 GeorgeMW, May 16, 2018
  2. bisco

    bisco cookie crumbler

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    1) yes

    2) probably not at 85k. maybe look at injector cleaning, throttle body/maf etc.
     
    #2 bisco, May 16, 2018
  3. Kevin_Denver

    Kevin_Denver Active Member

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    1. Yes, About every 60k is what is generally recommended by the forum members here based on used oil analysis. Toyota calls this fluid "lifetime", but it should really be replaced at a regular interval. "Lifetime" is probably an okay title if you think the life of a car should be 150k miles.
    2. "Tremors" are a normal part of the idling process when the car transitions from stage 3 to stage 4 warm-up stages. Only Toyota knows exactly what the ECU is doing, but my guess is adjusting valve and ignition timing finding the boundary limits. This usually takes 5-20 seconds, after which the car engine gives a sharp "bump" and then enters stage 4. Once in stage 4 it will turn on and shut off the engine smoothly. See this for reference: http://techno-fandom.org/~hobbit/cars/five-stages.txt. Normal spark plug interval is every 120k; your plugs should be okay.
     
    #3 Kevin_Denver, May 16, 2018
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  4. Tideland Prius

    Tideland Prius Moderator of the North
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    Updated your title to reflect your questions.
     
    #4 Tideland Prius, May 17, 2018
  5. GeorgeMW

    GeorgeMW Junior Member

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    thank you all for your attention :)
    and thanks for editing my post to be easier to come by.
    anyway, is the mpg of 45.5 normal at this temperature? i thinks somewhat lower than normal...
     
    #5 GeorgeMW, May 17, 2018
  6. jerrymildred

    jerrymildred Senior Member

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    That's within the normal range and pretty close to average. It depends on your driving style and traffic conditions. Lots of info in this section. Gen 2 Prius Fuel Economy | PriusChat
     
    #6 jerrymildred, May 17, 2018
  7. GeorgeMW

    GeorgeMW Junior Member

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    thanks for the info, everyone!
     
    #7 GeorgeMW, May 18, 2018
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