Rough startup when cold, P0300-P0303 codes

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by LazuliNyx, Jan 18, 2025 at 11:29 AM.

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  1. MAX2

    MAX2 Member

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    Nice photos!
    Is there a photo of the intake manifold and EGR pipe?
    Are they clean or do they have traces of carbon soot on them?
     
    #21 MAX2, Jan 23, 2025 at 1:56 AM
  2. Mendel Leisk

    Mendel Leisk Witness Leader

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    Compare the turning of both old and new water pump? I think that’s the go-to check.

    regarding form-in-place gasket choices, I should note: I’ve NEVER done anything remotely close to a head gasket replacement. Or even timing chain cover reseal. I’ve cleaned the full EGR system a couple of times now, and fervently pray that’ll let me whistle past the head gasket graveyard. (with the odo on our 2010 at 103k kms, adding 3k yearly, I think we’re ok…)

    That said, Gasket Master’s form-in-place gasket pick seems sensible for DIY. Toyota spec’d FIP gasket comes with instruction to apply and install the cover within 3 minutes, and have all the bolts installed and torqued by the 15 minute mark. All 20 plus of them, varying bolt sizes and torque values.
     
    #22 Mendel Leisk, Jan 23, 2025 at 9:58 AM
    Last edited: Jan 23, 2025 at 10:05 AM
  3. Mendel Leisk

    Mendel Leisk Witness Leader

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    Had a question about which face of gasket was shown, figured it out (it’s the face against the head).
     
    #23 Mendel Leisk, Jan 23, 2025 at 10:05 PM
    Last edited: Jan 23, 2025 at 10:16 PM
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  4. LazuliNyx

    LazuliNyx Junior Member

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    175K. City. I got it around 120K and took care of it, but didn't know about the EGR flaws in this car.
     
    #24 LazuliNyx, Jan 24, 2025 at 8:38 AM
  5. LazuliNyx

    LazuliNyx Junior Member

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    Yup. It's amazing how a simple black coating failing can destroy a whole engine.
     
    #25 LazuliNyx, Jan 24, 2025 at 8:39 AM
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  6. LazuliNyx

    LazuliNyx Junior Member

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    Good luck with your 3rd gen's head gasket. That's definitely a low mileage car. Makes sense about toyota's pick, they want something fast for when the engines are being assembled in the factory rather than when a mechanic or home mechanic is turning with a wrench by hand.
     
    #26 LazuliNyx, Jan 24, 2025 at 8:43 AM
  7. LazuliNyx

    LazuliNyx Junior Member

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    I haven't taken pictures, but I cleaned them and replaced the EGR valve 2 months ago. There was some additional soot building since them, so I cleaned it out. It's a dirty as **** EGR system in that car. Also, if you look at the intake passages on the head, you can see there's carbon and oil buildup there.
    IMG_2337.JPEG
     
    #27 LazuliNyx, Jan 24, 2025 at 8:51 AM
  8. Mendel Leisk

    Mendel Leisk Witness Leader

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    Clogged EGR likely the ultimate culprit.
     
    #28 Mendel Leisk, Jan 24, 2025 at 8:54 AM
  9. Mendel Leisk

    Mendel Leisk Witness Leader

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    That was the car’s first EGR cleaning presumably?
     
    #29 Mendel Leisk, Jan 24, 2025 at 9:10 AM
  10. LazuliNyx

    LazuliNyx Junior Member

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    The first since I learned about it, I’ve had it since 120k miles. I don’t know if the previous owner cleaned it. When I did it, it wasn’t too obstructed but I don’t know how much carbon it takes to fowl things up. The biggest problem I had was the old EGR valve had the groove cut into it leading to a check engine light. Hence why I replaced it.
     
    #30 LazuliNyx, Jan 24, 2025 at 9:23 AM
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  11. Mendel Leisk

    Mendel Leisk Witness Leader

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    Frustrating, the plastic built into crucial components. Also there the water pump impeller, oil filter housing, also problematic.
     
    #31 Mendel Leisk, Jan 24, 2025 at 9:30 AM
  12. LazuliNyx

    LazuliNyx Junior Member

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    Yeah. The first time I did my oil (lived at an apartment for 5 years so I took it to a shop) I bought a replacement oil filter housing just in case.
     
    #32 LazuliNyx, Jan 24, 2025 at 10:13 AM
  13. Mendel Leisk

    Mendel Leisk Witness Leader

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    I did the conversion to spin-on. Appreciate the stock system is ecologically superior, but it’s problematic.
     
    #33 Mendel Leisk, Jan 24, 2025 at 10:17 AM
  14. rjparker

    rjparker Tu Humilde Sirviente

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    Original oil filter housing after more than 60 oil changes; same with water pumps. Use right tool and change coolants. Not Toyota's fault in this case.

    If we need to complain think about the brake booster, inverter and rings. But Toyota extended their warranty on each, just not forever.

    When I started buying cars we were happy to get 50,000 miles on an engine, routinely changed master cylinders and never heard the term inverter until college and power electronics 301.
     
    #34 rjparker, Jan 24, 2025 at 10:24 AM
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  15. LazuliNyx

    LazuliNyx Junior Member

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    Oh, got a link for that?
     
    #35 LazuliNyx, Jan 24, 2025 at 10:27 AM
  16. LazuliNyx

    LazuliNyx Junior Member

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    I forget, what's the recommended mileage interval for the EGR cleaning?
     
    #36 LazuliNyx, Jan 24, 2025 at 10:55 AM
  17. rjparker

    rjparker Tu Humilde Sirviente

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    Prius Gen3 Oil Filter Conversion
    • Oil Filter Bracket (15609-37060) (15609-0T060) old
    • Union (90904-04006)
    • O-Ring x2 (96723-24020)
    • Flange Bolt x4 ( )
    • Oil Filter (90915-YZZN1) (90915-YZZF2) old
    IMG_7287.jpeg

    Instructions
    Tech: Lexus CT200h Spin-On Oil Filter Conversion – Ptetra Automotive

    Video


    A key point to buying Toyota parts is to use their online Toyota dealers. Most dealers have one, prices vary so you shop but 25% off and free shipping is the bar. Sometimes a local dealer has an online shop and you may have an option for local pickup (ship to store).

    I have had some luck just asking for a discount at the parts window. Discount to repair shops can be 50%- dealer cost is less than that. Dealers are independently owned by billionaires so your guy may or may not participate.

    There are annual nationwide sales as well usually around holidays.

    These are two I use most often.

    McGeorge/Ourisman
    Genuine Toyota Online Parts| OEM Toyota Parts| Toyota Parts Store | Toyota Parts|Toyota Online Parts| Toyota Parts Online


    Hoover Toyota (sometimes sells on ebay as well)
    Genuine Toyota Parts and Accessories: Official Online Store Hoover Toyota

    Finally Hybridpit sells these as a package minus the bolts for $205 shipped. You can do better if you shop.
     
    #37 rjparker, Jan 24, 2025 at 11:21 AM
    Last edited: Jan 24, 2025 at 11:47 AM
  18. Mendel Leisk

    Mendel Leisk Witness Leader

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    Yes, in my signature (on a phone, turn it landscape to see signatures).
    Definitely, approx. $70 USD was my all-in, shipped cost. See attached Amayama receipt:
     

    Attached Files:

    #38 Mendel Leisk, Jan 24, 2025 at 12:13 PM
  19. Tideland Prius

    Tideland Prius Moderator of the North
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    *Threads merged*
     
    #39 Tideland Prius, Jan 24, 2025 at 1:00 PM
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