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Spark plug replacement

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Lodrun, May 4, 2011.

  1. Lodrun

    Lodrun My proper car is an MGC

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    My UK Prius is 4 years old with 40,000 miles on the clock. The service book says replace the spark plugs every 4 years/60,000 miles. Do I need to change them now or will they last? It runs fine at the moment.
     
    #1 Lodrun, May 4, 2011
  2. seilerts

    seilerts Battery Curmudgeon

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    Not sure what they would put in yours, but iridium plugs last a very, very long time. In the US, the service interval is 120,000 miles.
     
    #2 seilerts, May 4, 2011
  3. 2009Prius

    2009Prius A Wimpy DIYer

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    Really strange the same spark plug would have different life in different regions. :confused:
     
    #3 2009Prius, May 4, 2011
  4. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Well, why is it that the US Prius has a 120K mile change interval in much of the country, but a 150K mile change interval in CA and other PZEV states? I suspect the latter change interval was established more for regulatory reasons and less for engineering reasons. I don't believe that the gasoline quality in the PZEV states (besides CA) is notably different from non-PZEV.

    Since the engine ECU will tolerate ~25% misfire before logging the misfire DTC P030x, I would err on the side of replacing the spark plugs sooner vs. later (my personal practice is to replace at 100K miles.) Seems silly to have unburnt fuel heating up the catalytic converter.
     
    #4 Patrick Wong, May 4, 2011
  5. J.Wilkie

    J.Wilkie 80 Mile Daily Commute

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    Did mine at 100k too. No issues.
     
    #5 J.Wilkie, May 4, 2011
  6. stefano5777

    stefano5777 Member

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    I changed mine at 100k as well with no issues and to be honest plugs still looked good.
     
    #6 stefano5777, May 4, 2011
  7. F8L

    F8L Protecting Habitat & AG Lands

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    At 120k my plugs looked good. They car maybe have ran a bit smoother after the change but it could just be my imagination.
     
    #7 F8L, May 4, 2011
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