toyota prius gen 3 engine knocking solved

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Anas Al-Mustafa, Jun 7, 2015.

  1. bisco

    bisco cookie crumbler

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    lots of threads here. search google is easier, look for priuschat hits, ot put it in your search terms.

    how many miles on your car? you need to clean the egr circuit.

    search egr, intake manifold, oil catch can, head gasket, oil burning, coolant, knocking, shaking, cold soak and etc.
     
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  2. Krall

    Krall Junior Member

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    l’ve been using google search, 99% are for the cold start knock. Unless it’s the same issue?

    280k, already replaced the whole EGR circuit.
     
  3. bisco

    bisco cookie crumbler

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    sorry, i misread your post. i can only imagine engine wear, but i'm not sure.
     
  4. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Leak-down test.
     
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  5. Krall

    Krall Junior Member

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    No worries info it all the time

    I suspect the same, it’s just odd how smooth it runs after the knock goes away.

    Thanks, trying to find a shop to do that. I thought I read a post though that said due to the way they leak into the cylinder heads the test might not show anything.
     
  6. bisco

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    do you get it on every cold start?
     
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  7. jzchen

    jzchen Senior Member

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    While not directly stated, I believe his knock is after warming up and under engine load.

    LSPI maybe? Or is the car moving at high speed? (I'd initially try a higher octane fuel).
     
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  8. Krall

    Krall Junior Member

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    It doesn't do the cold knock currently, but it happened in the past a few times. Now it knocks while driving and after the engine is already warmed. So like 10-30MPH. Not sure if I've heard it do it at speeds above that. I initially thought the same thing, bad gas and then went with 93 octane and fuel cleaner. It didn't clear the issue. I might try it again, but currently I decided not to drive it as I'm afraid I'm going to throw a rod.
     
  9. ChapmanF

    ChapmanF Senior Member

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    Knocking not at idle, not at full load, but under moderate load?

    Checked the four small EGR passages in intake manifold?
     
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  10. Krall

    Krall Junior Member

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    I mean it’ll knock at idle upon startup, but not cold. If it doesn’t knock at start up while warm then it’ll do it while driving.

    The EGR circuit, cooler and manifold were replaced a couple of months ago. I can’t believe it’s clogged again, but it does burn oil.
     
  11. ChapmanF

    ChapmanF Senior Member

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    Just checking. :) There are, of course, other things that can contribute to driveability issues.
     
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  12. Krall

    Krall Junior Member

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    Yeah, I was going to do the injectors and plugs. I went with 93 octane and fuel cleaner which initially seemed to clear up the issue and then it started again. I have lost some coolant and for about 5 seconds the overheating light came on the dash. I think I may just throw some money at a leak down test to see if that's the issue or not.
     
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  13. freebird1

    freebird1 New Member

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    @nicholas.bray
    If you had knocking come back or use techron every 5k miles

    Im having this issue and replacing spark plugs didn't help
    Will try techron





     
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