Going overboard?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by benwray1, Jun 28, 2025 at 3:14 PM.

  1. benwray1

    benwray1 Junior Member

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    2010 Prius
    Model:
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    Hey all, I am doing some maintenance on my Gen 3 Prius IV, with 162K miles on it. The engine bay is super dirty, mostly because of a valve cover gasket leak that I am fixing. Here's a list of what I'm doing:

    1. New Plugs/Coils
    2. Valve Cover Gasket
    3. EGR valve cleaning, Throttle Body cleaning, Intake Manifold and Intake cleaning
    4. EGR cooler/tube cleaning
    5. PCV replacement
    6. Oil Catch Can Install
    7. Fuel injector cleaning - I bought a tool on Amazon to clean them after you remove them.
    8. Struts? - I'm not sure if I need to do this or not. This Prius IV is louder than my other Gen 3 Prius I as far as tire noise.
    9. New weatherstripping/window seals
    10. Sound absorption spray under wheel wells.
    11. Sound absorption panels in doors.
    12. Transmission fluid
    13. Coolant and Inverter Coolant

    None of this is due to poor performance, but I'd like to get the best MPG and have the car last as long as possible. I feel like I may have taken on too many improvements. I'm following some of the other posts in this thread but would appreciate your thougths. Thanks!
    Ben
     
    #1 benwray1, Jun 28, 2025 at 3:14 PM
  2. NutzAboutBolts

    NutzAboutBolts Senior Member

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    I wouldn’t replace the ignition coils if it’s not bad.
    But everything else seems like good preventative maintenance. You better brush up on how to replace the headgasket for the future.
     
    #2 NutzAboutBolts, Jun 28, 2025 at 11:09 PM
    Brian1954 and benwray1 like this.
  3. Grit

    Grit Senior Member

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    Vehicle:
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    Shocked that te standard engine oil and trans fluid replacement was left out.
     
    #3 Grit, Jun 29, 2025 at 4:18 AM
  4. adrtho4

    adrtho4 Junior Member

    Joined:
    Jul 12, 2016
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    Location:
    Houston, TX
    Vehicle:
    2014 Prius
    Model:
    Three
    When I did my head gasket job I...

    1. Replaced the engine coils and spark plugs (bought a kit that had both)
    2. Replaced PCV valve
    3. Replaced Head gasket
    4. Replaced Water Pump (will replace again as the water pump I bought isn't running properly)
    5. Replaced Timing chain tensioner gasket
    6. Changed Filter, oil, and coolant
    7. power washed the egr, timing chain cover, and intake manifold and cleaned those parts very well.

    I didn't bother with the fuel injectors as I didn't remove those. The rest of the stuff, honestly sounds like "extra credit" or stretch goals. I do need to replace the weather striping on my car however but struts? Maybe I could do the same. Interested in that fuel injector kit you mentioned however. What did you end up buying?
     
    #4 adrtho4, Jun 29, 2025 at 8:53 AM
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