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. Tande

    Tande Active Member

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    Quick way to lose $150.00 .......just say'in
     
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  2. SB6

    SB6 New Member

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    Ugh you're probably right... I was about to call and see about cancelling that "diagnostic test" when they called me and said my car is ready. Before I could ask about what was done about the engine rattle, the lady hung up on me. Tried calling back but it keeps looping me through the same automated answering service menu... What's more is that they're supposed to close at 5, but the lady called me at 5:05... o_O But the automated answering service says they're busy, not that they're closed
     
    #1022 SB6, Feb 2, 2019
    Last edited: Feb 3, 2019
  3. Atari

    Atari Junior Member

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    Make sure you note that it is experiencing the symptoms and have them document your request for them to repair it in their system.
     
  4. SB6

    SB6 New Member

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    So it looks like they actually changed the egr valve for me. It's not letting me edit my previous posts, but yeah.

    I had to take my car to the dealership for some airbag and software recalls. I asked if there were any recalls for engine rattle, as I'd been hearing engine rattle on cold starts. Like a I mentioned a couple posts back, the service advisor told me that there was something for the egr valve, but they would need to run a diagnostic test first. If that turned out not the be the issue, then I'd have to pay a $150 diagnostic fee. If it was the problem, then they'd cover it. They called me back very quickly to pick up my car, so I had assumed they didn't do it. But apparently they did change the egr valve. I haven't driven the car much since then, except for driving it back home yesterday, but so far I haven't heard any engine rattle.
     
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  5. Jose Reyes

    Jose Reyes Junior Member

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    I was wondering if anyone has some TSB's for a 2013 Prius. I have gone to Wyoming and big bear noticed that there is a loud knocking noise for 3-10 sec after a cold start.
     
  6. Lightning Racer

    Lightning Racer Active Member

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    Here are some, not including the one in the original post in this thread, which was withdrawn:
     

    Attached Files:

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  7. Tamas Patai

    Tamas Patai New Member

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    Hi Everyone,

    I'm new to this forum, and sorry for my English (I'm from Hungary).
    I have the good old knocking occured on my 2010 Gen3 since last week. It has 315k kms / 200k miles in it. The car was serviced properly in the Netherlands in her first 7 years, I bought it one year ago. Last year - 10k miles before - my official Toyota-service-dealership changed my fluids, spark plugs, filters. Last month the same Toyota-service changed the oil. I have 0w20 in it and no loss of oil at all. I use the car for daily 2x10 miles driving, and sometimes shorter, sometimes longer trips.
    The knocking suddenly came in one afternoon last week. Oil and coolant looks clear, I have heating, and I have no error codes, but sometimes I have white smoke coming from exhaust, only after knocking. I took it to Toyota for a diagnosis, and the computer only can see "invalid burning in the engine" on those moments when it's knocking.
    At first look, they said, it's like like bad gasoline: contaminated with diesel or water - or coolant leaks into the engine, which cause this contamination. I filled my tank at Shell, using 95 octane gasoline.
    They assume it can also be a coolant leaking from EGR-cooler, but it wasn't tested. Probably, the coolant leaks into the returned exhaust gas, and gets into the manifold through the EGR, and so on.
    I plan to do the EGR - EGR-cooler - intake manifold cleaning this weekend, and I will do a pressure test on the cooler.

    There is one strange thing I realized, and I haven't seen anyone on this forum with the same experience (or just haven't read back enough), so I share with you, and ask your opinion then:

    If I drive 10 miles or more at higher speed, then switch to electric mode for 2-3 minutes, then switch back to petrol engine, the knocking occurs again = I suppose something "collected" in EV mode, and "released" into the burning area when the motor switches on again.
    If I stop the car with hot engine (10k miles or more), and leave it to rest for a few minutes or overnight, the knocking also occurs.
    If I stop the car with hot engine (10k miles or more), and IMMEDIATELY open the hood and open the coolant reservoir cap, some pressure will come out with a hiss, and some coolant returns to the reservoir = next start the car will start fine without knocking (!).

    So my logic said the hot coolant system pressure is enough force the coolant through on a leak, and it would reach the engine.
    There is no noticeable coolant loss - however, I only have 250 miles driven since the first knocking.

    What are the possible locations for a coolant-leak?

    - head gasket ?
    - EGR cooler ?
    - throttle body?
    - else?

    Thank you for reading this.
     
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  8. Mendel Leisk

    Mendel Leisk Sidewalk Supervisor

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    I'm thinking head gasket but not that knowledgeable. A leak-down test would pinpoint?

    Good reporting by the way.
     
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  9. Tamas Patai

    Tamas Patai New Member

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    Hi there,
    I've made the cleanings for intake, egr, egr cooler. Also checked spark plugs for any signs of head gasket failure. System wasn't so coaled as I expected, the spark plugs looks perfect and no difference between them. EGR cooler pressure test was negative for leaking.
    I'm confused now, what the heck makes my knocking..? I ordered a bottle of K-Seal, next week I'll give a try.
    Anyway, there must be a coolant leaking somewhere, because some capuccino showed up under my throttle body, and looks like it came through the U-shaped pipe connected to PCV.
     

    Attached Files:

  10. Tamas Patai

    Tamas Patai New Member

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    Update: knocking disappeared.I'm afraid it will come back when the bottom of the intake fills with capucciono again.
    Instead of knocking, I have some water-flowing-sound heard from driver seat, when the petrol engine turns on.
     
  11. pjpesanka

    pjpesanka Junior Member

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    Just stumbled upon this thread after trying to start my 2010 Prius and hearing a horrendous noise from under the hood. Came back inside to scour the intetwebs and filmed the following the next morning. The previous night I ran the car for less than a minute to move it in the driveway. Temperatures were low 30s F dropping to mid 20s.
    When I filmed this I shifted from P to N right before you see the big shake and the worst of the noise go away.

     
  12. PRI6080

    PRI6080 Junior Member

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    So if my vehicle is doing just ONE of these, and I live in CA(extended warranty ), do they replace the intake manifold free of charge?
     
    #1032 PRI6080, Feb 20, 2019 at 12:13 PM
    Last edited: Feb 20, 2019 at 1:22 PM
  13. hotelprisoner

    hotelprisoner Junior Member

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    Head gasket. Coolant tank is empty.
     
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