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Engine knocking, stutter n voilent shaking

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Raj gowri, May 7, 2019.

  1. Raj gowri

    Raj gowri Junior Member

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    Hi there,

    I drive toyota prius 2011, gen 3. It has done. 286000 kms. 6 months ago i replaced the plugs cleaned the EGR elbow, which helped resolve the problem. The problem appeared again, this time it engine knocking was harder and violent I did the same checks and replaced the plugs, cleaned the EGR unit, intake manifold, this has subdued the problem. However i can still feel the engine vibration when im crusing at a constant speed or leave the acclerate after a reaching 50kms or more.

    Can someone please suggest what could be wrong or what i have to do to fix this issue.
     
    #1 Raj gowri, May 7, 2019
  2. Mendel Leisk

    Mendel Leisk Senior Member

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    Is the coolant level in the engine coolant reservoir stable, not regularly requiring top up? Also, how was the EGR condition when you first cleaned it?

    Reading more carefully: you mention you cleaned the EGR "elbow", would you mean just the stainless steel pipe going from intake manifold to EGR valve/cooler assembly? If so, you've left a lot to be cleaned: both the valve/cooler, and you really need to clean the intake manifold as well, paying particular attention to the small passages at each port: they feed EGR gasses into the intake ports.
     
    #2 Mendel Leisk, May 7, 2019
  3. Raj gowri

    Raj gowri Junior Member

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    Thank you for the response. Few days back i have cleaned complete EGR, changed the spark plugs and clean the intake manifold. I dont see any error code while i scannes the car nor there is any engine check light on dash board. I also spray cleaned the MAF sensor.

    Oh ya, engine coolant is full.

    After doing all the clean up engine knocking has reduced considerably but it hasnt stopped.

    What else do i have to look at to fix this issue.

    Please suggeest
     
    #3 Raj gowri, May 8, 2019
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  4. Mendel Leisk

    Mendel Leisk Senior Member

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    Do a leak down test?
     
    #4 Mendel Leisk, May 8, 2019
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  5. mjoo

    mjoo Senior Member

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    Have you cleaned or replaced the PCV valve?

    Also, pay special attention to the 4 small EGR orifices in the intake manifold - they're easy to miss. Most people use pipe cleaners.

    Other than that some fuel system cleaner can reduce the carbon buildup in the engine cylinders.

    Good luck

    Pixel XL ?
     
    #5 mjoo, May 8, 2019
    Last edited: May 8, 2019
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  6. Raj gowri

    Raj gowri Junior Member

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    Hi Mendel

    Leak test? Any specific leak test i have to do? I got no idea... im a new bee at DIY :)
     
    #6 Raj gowri, May 8, 2019
  7. tvpierce

    tvpierce Senior Member

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    Did you remove and clean the EGR cooler or just the valve and tube? Are you using the correct Denso or NGK Iridium plugs?
     
    #7 tvpierce, May 8, 2019
  8. Raytheeagle

    Raytheeagle Senior Member

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    Oil catch can?
     
    #8 Raytheeagle, May 9, 2019
  9. Mendel Leisk

    Mendel Leisk Senior Member

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    Maybe work with a pro mechanic: talk to a few, see how they respond.

    In a nutshell: a leak down test connects an air hose at spark plug hole, one cylinder at a time, while that cylinder is at top dead centre of compression stroke. The hose is pressurized and has a special gauge set for detection of various symptoms. Also, you can look and listen at various places, see where air may be escaping, draw conclusions.

    Full disclosure: never done this myself.

     
    #9 Mendel Leisk, May 9, 2019
  10. Angel209

    Angel209 Junior Member

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    Would the egr cooler make shaking and vibrating of the engine
     
    #10 Angel209, Aug 8, 2019
  11. Mendel Leisk

    Mendel Leisk Senior Member

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    The Waranty Enhancement Program notification we got from Toyota Canada (May 2017 SOSH-W11-1A) has the expression "rough idle and/or tapping noise from the HV transaxle at cold start due to a sticking EGR valve due to excess carbon build-up".

    IMG_1025.JPG
     
    #11 Mendel Leisk, Aug 8, 2019
  12. schmuber

    schmuber Member

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    I'm fairly certain that you did not clean the EGR cooler. You know, pinching and disconnecting coolant hoses, reaching the unreachable nuts and studs…
     
    #12 schmuber, Aug 8, 2019
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