Toyota Prius 2011 (JDM) - Cold start engine rattling sound

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Fouad, Jul 20, 2020.

  1. Fouad

    Fouad New Member

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    2011 Prius
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    I bought this car used few months back. It was driven 150,000 Kms. I changed all necessary parts such as: Fuel filter/pump assembly, oil/air filter, transmission oil, engine oil & spark plugs. Got my car scanned and no error codes were found. As soon as I got the transmission oil changed, my car developed a rattling noise at start up (in morning) and sometimes at low rpm during drive. I observed that this rattling noise was mostly audible when the hybrid battery was depleted and engine converted to petrol. I read some articles on internet and changed set of ignition coils, cleaned EGR pipe, throttle and hybrid battery cooling fan myself at home.
    The rattling noise is still there and I don't know what to do. Please share any solution which may help.
     
  2. SB6

    SB6 Member

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    I don't know if it's related to your rattle noise (I'm still relatively new around here), but consider cleaning the intake manifold, the EGR cooler, and the EGR valve
     
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  3. Fouad

    Fouad New Member

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    Thank you for your valuable feedback
     
  4. ZBrink

    ZBrink Member

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    IV
    I have a rattle whenever the ICE first starts and stops. I cleaned everything associated with the EGR and it did not solve my problem. I am currently at a loss. I'm thinking the EGR valve may just be bad.
     
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  5. Raytheeagle

    Raytheeagle Senior Member

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    Have you installed an oil catch can?
     
  6. Fouad

    Fouad New Member

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    Thank you for sharing your experience, you might want to try to change the ignition coils, may be that'll help in your situation
     
  7. Fouad

    Fouad New Member

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    Please can you elaborate, never heard of it before
     
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  8. Raytheeagle

    Raytheeagle Senior Member

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    Here's some light reading in the Gen3 section on the topic:):

    Oil Catch Can, Eliminate that knock!

    That should be able to answer your curiousity and give you some background;).

    I put one on our old 2010 and also on our 2019 Prime as a preventative measure(y).
     
    #8 Raytheeagle, Jul 21, 2020
    Last edited: Jul 21, 2020
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  9. ZBrink

    ZBrink Member

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    I'm not going to throw parts at it willy nilly. I'm actually going to try unplugging the EGR valve temporarily to see if the sound goes away.
     
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