Odd noise under engine during initial acceleration (video included)

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Shivgtr, Sep 30, 2020.

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  1. Shivgtr

    Shivgtr New Member

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    I recently got my engine replaced on my 2007 Prius. Noticed that after startup, I hear a loud tack-tack-tack noise during initial acceleration.

    Here's the video I took from under the engine -


    The clatter is more pronounced at 16/17 seconds.

    Once the car is running, I don't hear the noise as much, but it's there when the engine kicks on after being on battery. I should mention that the oil is full, and car runs fine once it's on the road/highway. It's just a very loud jarring noise.

    Any suggestions?
     
    #1 Shivgtr, Sep 30, 2020
    Last edited: Sep 30, 2020
  2. SFO

    SFO Senior Member

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    Welcome to PriusChat!!

    Didn't listen, but how many claimed miles are on this USED engine?

    Maybe a rod knock, only because the video was taken from underneath and not the top, where I would assume tappets or valves.
     
    #2 SFO, Oct 1, 2020
  3. edthefox5

    edthefox5 Senior Member

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    That's not good never heard that noise before on this site. That sucks as the engine is constantly starting and stopping.
    Almost like the engine/trans connection is not right or a blown damper which is the spring loaded plate that dampens the load between the engine and trans.

    Does it do it if you put a load on the engine like on a highway on ramp and you have to almost floor it? Or is it just the engine spool up spool down on start stop that you hear it.

    But probably like SFO says blown engine. Rod knock. We see many engine failures on this site from lack of oil in the engine as the engine ages and poor maintenance it eats oil.
     
    #3 edthefox5, Oct 1, 2020
  4. rjparker

    rjparker Tu Humilde Sirviente

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    Take it back to the shop that changed the engine
     
    #4 rjparker, Oct 1, 2020
  5. Shivgtr

    Shivgtr New Member

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    Yes, taking it back to the shop is my next step. They informed me that the engine has 28k on it.

    I should add, that I'm pressing on the gas every time the engine revvs, so it's not on idle. Apologies for the confusion that may have caused.

    Maybe a loose washer or nut is left behind in the oil pan?
     
    #5 Shivgtr, Oct 1, 2020
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  6. dolj

    dolj Senior Member

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    Is it starting and stopping on its own, or are you making it start and stop? If you are making it start and stop, how are you achieving this?
     
    #6 dolj, Oct 1, 2020
  7. Shivgtr

    Shivgtr New Member

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    I'm in the drivers seat, pressing the gas so the engine kicks on. I'm instigating the revs to highlight the clatter
     
    #7 Shivgtr, Oct 1, 2020
  8. Jmack111

    Jmack111 Member

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    Normally air getting in fuel injectors or leaking gas. Sounds just like metal in the cylinder. Replace black spacer and rubber mount

    Posted via the PriusChat mobile app.
     
    #8 Jmack111, Oct 2, 2020
  9. Shivgtr

    Shivgtr New Member

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    Thank you. I know it can be hard to predict this, but is it drivable at this time?
     
    #9 Shivgtr, Oct 2, 2020
  10. edthefox5

    edthefox5 Senior Member

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    Thought you were in inspection mode not sure how you can say it’s near the trans

    Go on YouTube and search

    Prius inspection


    It will show you the the chicken dance how to put it in that mode where the engine idles endlessly
    Giving you the opportunity to check the engine

    Jack up the front of car get under there and listen for it in the oil pan it probably has the bad throw rod.
     
    #10 edthefox5, Oct 2, 2020
  11. rjparker

    rjparker Tu Humilde Sirviente

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    Maintenance Mode to Continuously Idle Engine (Don't drive in this mode, damage may occur)
    1. Press Start button 2 times (without brake)
    2. Press Gas Pedal 2 times
    3. Press brake and shift to Neutral
    4. Press Gas Pedal 2 times
    5. Press Park
    6. Press Gas Pedal 2 times (hybrid warning light will start flashing)
    7. Press Brake and Start button
      (starts engine, don't drive it, shutdown to return to normal)
    (Don't drive in the above mode, damage may occur)
     
    #11 rjparker, Oct 2, 2020
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  12. Shivgtr

    Shivgtr New Member

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    Thank you. I'm happy(?) to say that the noise has gone away. I don't know what did it, but I didn't drive it for two weeks or so.
     
    #12 Shivgtr, Oct 7, 2020
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  13. dolj

    dolj Senior Member

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    Are you in the habit of turning the car off while it is in the first 50 seconds of warm-up? That can make the next start-up clank and rattle until it get things back in order.
     
    #13 dolj, Oct 7, 2020
  14. rjparker

    rjparker Tu Humilde Sirviente

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    Surprising...
     
    #14 rjparker, Oct 8, 2020
  15. Shivgtr

    Shivgtr New Member

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    Not particularly, the only time I can think of is if I need to move the car off the driveway to let someone out or something. Do we think the noise was engine knock?
     
    #15 Shivgtr, Oct 8, 2020
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