NEW!!! Service Bulletin for Engine Knocking at Startup T-SB 0012-10

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by seilerts, Jan 12, 2012.

  1. Mendel Leisk

    Mendel Leisk Senior Member

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    Did they change the EGR valve only, or both the valve and cooler?

    It's good that they've cleaned the intake manifold, hopefully thoroughly: it really is part of the EGR circuit.

    Also, how many miles on the car?
     
  2. Abdi85

    Abdi85 New Member

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    Hi they change both and my car miles 191000 and also the change spare plugs today and still have the knock. Thanks
     
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  3. cmderks93

    cmderks93 Junior Member

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    How cold is it now in your area? In my case, there is no knocking anymore when it's warmer outside. ( warmer than 10c or 50f)
     
  4. Mendel Leisk

    Mendel Leisk Senior Member

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    Is engine coolant level in the reservoir stable, not always dropping? If everything else is addressed, could be overheating from chronic EGR neglect, and just age/miles, has tipped the the head gasket to failing.

    Still, as long as it's the dealership that's doing all the EGR and intake manifold work, I'm really sceptical. I'd want to open it up and see for myself before dismissing problems in those areas. I don't trust them to do it right, in particular because it's so labour intensive.
     
    #1044 Mendel Leisk, Apr 5, 2019
    Last edited: Apr 5, 2019
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  5. icewater

    icewater Junior Member

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    I noticed this one morning this past winter! I had no idea what it was and was highly worried my engine was damaged.

    Is this still something that the dealership will repair (on a 2011 Prius with 120K mi)?
     
  6. Mendel Leisk

    Mendel Leisk Senior Member

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    Easier, and likely way more effective, to read up on the system, DIY.
     
  7. Tcortez

    Tcortez Junior Member

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    Did you ever find the problem with your car? I have the same symptoms.
     
  8. cmderks93

    cmderks93 Junior Member

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    Anyone had changed the intake manifold to the new designed one? With partnummer ending on 54?
     
  9. JC91006

    JC91006 Senior Member

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    I just got this notorious knock on my 2010. It seems after the knock, the coolant level in the reservoir had slightly increased. Not sure what that means.

    It's at the dealer now getting the warranty enhancement for the sticking egr valve. But I'm sure that won't solve the problem
     
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  10. Raytheeagle

    Raytheeagle Senior Member

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    Time for a circuit cleanse (y).
     
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  11. The Critic

    The Critic Resident Critic

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    I will be in your area next week. We can do the head gasket.
     
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  12. JC91006

    JC91006 Senior Member

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    I don't think it's the head gasket yet. I don't drive this car enough for it to go bad. It seems to have a slight knock when it sits for a few days. It just developed that big knock a few days ago.

    I've checked the entire egr/intake circuit a few months ago, it's not the issue.

    I've also moved house last month, but I'm very close to my old house, now I'm JC91007
     
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  13. Raytheeagle

    Raytheeagle Senior Member

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    Hopefully you have the same or greater space available for your Prius “collection”:).

    I left our 2010 for 10 days last year at the Oakland airport and when I returned, it was the loudest, most violent knock I’ve had:eek:.

    That was with an oil catch can installed:cool:.

    Just keep an eye on the coolant level(y).
     
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  14. JC91006

    JC91006 Senior Member

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    Yeah that's the violent knock I got. I have it at longo Toyota right now, hopefully they can figure out the knock. I know my egr circuit is clean, just the valve is the unknown. And there is a warranty enhancement to get that replaced
     
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  15. Raytheeagle

    Raytheeagle Senior Member

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    Did you actuate and clean the valve when you did the intake manifold and cooler cleanse?
     
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  16. JC91006

    JC91006 Senior Member

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    I didn't clean the valve as there was nothing visibly wrong with it. It seemed to have functioned properly as well.

    But since Toyota says the valve is an issue with the warranty enhancement, it might be the problem. Which makes sense the car only knocks after sitting for a while (valve has a chance to stick)
     
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  17. Tcortez

    Tcortez Junior Member

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    B02D46BE-8341-4076-A6AC-86B3F1FA3152.jpeg 3604E945-71DB-45C7-A73F-FD4371784D1C.jpeg 922EF2C5-960F-4189-9BDE-BA3953D23C0A.jpeg I bought a cheap boroscope that hooks up to the iPhone and found my startup knocking system in cylinder 2 , I have 220000 miles , I poured k seal in yesterday and this morning it started up as normal. I know this is a bandaid fix , the k seal stuff is a real small bottle, probably like 8 ounces. I got it at Autozone, I’m just glad I looked in the cylinder and did not start buying all kind of new parts at this Lemmon. The car still drives great when warmed up. The other 3 cylinders looked good.
     
  18. Raytheeagle

    Raytheeagle Senior Member

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    If you have an impact screwdriver you can remove the 2 machine screws and push on the plunger and get it to go;).

    The carbon deposits get everywhere, and the valve seat isn’t exempt :cool:.
     
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  19. Tcortez

    Tcortez Junior Member

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    Check each cylinder with a boroscope in the morning or when it sits for a few days , see if it’s oil or coolant.
     
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  20. JC91006

    JC91006 Senior Member

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    I think Toyota will give me a new valve
     
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