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Gen 2 used motor problems

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by JohnStef, Nov 7, 2018.

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  1. 05PreeUs

    05PreeUs Senior Member

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    Easily testable with a quality scan tool by checking Mass air Flow rates under full acceleration and comparing to a similar car.

    Generally speaking, if the "cat" does not rattle or sound like there is a metal ball banging around inside it when tapped with a dead-blow hammer, they are not restricting flow enough to "matter". I have, on multiple occasions, removed the upstream O2 sensor and installed a compression test adapter (they use the same sparkplug thread) and measured backpressure to confirm it is within manufacturer specifications. The big problem with that is, what are the specifications for a G2 Prius? I have never found them.
     
    #21 05PreeUs, Dec 2, 2018
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  2. JohnStef

    JohnStef Member

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    Thank you JohnG
    I should look elsewhere for the engine being under powered, like spark plugs ...
    This motor has the intake from the original motor because I cleaned the MAF, throttle body, intake chamber and air filter.
    I have no codes, but it has the original NGK Iridium plugs in it, they even across all 4 with a light tan color and the spark plug pin and electrode landing site for the spark were very similar. This is typical of the plugs.
     

    Attached Files:

    #22 JohnStef, Dec 2, 2018
  3. 05PreeUs

    05PreeUs Senior Member

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    Hard to tell exactly, but those gaps look really wide.
     
    #23 05PreeUs, Dec 2, 2018
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  4. JohnStef

    JohnStef Member

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    I will check the gap ...
     
    #24 JohnStef, Dec 2, 2018
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  5. Patrick Wong

    Patrick Wong DIY Enthusiast

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    … which should be 1.0 to 1.1 mm. If any doubt, replace the spark plugs using the correct iridium spark plugs from NGK or Denso.
     
    #25 Patrick Wong, Dec 2, 2018
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  6. cnc97

    cnc97 Senior Member

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    If the engine was at or over 100k, I’d put new plugs in it and wash my hands of it.
     
    #26 cnc97, Dec 2, 2018
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