Engine Knocks before and After Head-gasket Replacement

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Gasketblower, Jul 29, 2021.

  1. Gasketblower

    Gasketblower Junior Member

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    Hello, I just did Head-gasket Job on My 2012 Prius V, I had signs of Blown Head gasket , loosing Coolant, White smoke out the back and rattle but the rattle wasn't that bad and had just started when I pulled the Head out and replaced the Head-gasket, water pump, Thermostat and Tensioner, and when I put everything back together I got no check engine light and the car is making unusual rattle ONLY on Idle when i give it gas its fine and runs normally here short clip of it please let me know what you guys think

     
  2. TMR-JWAP

    TMR-JWAP Senior Member

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    While the head was off, did you happen to verify piston to deck height on all 4 cylinders?? It's one of the best ways to check for a bent connecting rod, without total disassembly. A slightly bent rod will show up as the top of a piston being slightly lower than the other 3 when at top dead center. A slight bend will cause the piston to slap a bit. Eventually would likely lead to ventilating the side of the engine block. Just something to think about.
     
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  3. Mendel Leisk

    Mendel Leisk Sand Pounder

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    How many miles on it?
     
  4. jzchen

    jzchen Senior Member

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    EGR valve can cause rattle. Toyota has a newer design and ECU reprogram.

    Don't know if it applies to Canada...

    moto g(7) power ?
     
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  5. Gasketblower

    Gasketblower Junior Member

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    It has 288k km on it yes I am in Canada
     
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  6. Gasketblower

    Gasketblower Junior Member

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    When I ran health test with techstream it said my 4 coils were bad and it had x beside where it’s permanent and wouldn’t let me clear the code but my check engine light is off, i cleaned the hell out of the EGR and changed all its gaskets.
     

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  7. Mendel Leisk

    Mendel Leisk Sand Pounder

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    That's ~180K miles, which could be bent connecting rod territory. Remove all spark plugs, place a hardwood dowel in each hole (one dowel, placed first in cyl 4 then the successive cyl's), manually cranking engine to TDC with each cylinder. Use a very very flat/even blade atop the valve cover case to put a mark on the dowel for each cylinder. Maybe make the cuts 90 degrees apart around the dowel, and label the cyl no for each with a sharp-tipped felt pen. Then check if all the cuts are level.

    Very recently, after seeing signs of head gasket failure, which probably let coolant into a cylinder or two, historically likely to be #1 or #2.
     
    #7 Mendel Leisk, Jul 29, 2021
    Last edited: Jul 29, 2021
  8. Gasketblower

    Gasketblower Junior Member

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    I will try this method when I change coils today but I did similar method when head was removed and it was all looking good
     

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  9. Gasketblower

    Gasketblower Junior Member

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    I am going to also do compression test today I just have to figure out how to put the car in inspection mode using techstream I just got the software I only know basic features
     
  10. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Some Repair Manual info:
     

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  11. Gasketblower

    Gasketblower Junior Member

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    Thanks I appreciate the info, I am hopping it’s just coils and injectors that are not functions correctly!
     
  12. Gasketblower

    Gasketblower Junior Member

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    I did check the heights using straight edge and filler gauges all seem good, I am almost certain the problem is with my coils , turned the car in the morning today it ran very nice for solid 3 min and the noise came on for few secs and it went away again, my coils are on the way I didn’t go for OEM just yet but I probably will just gonna use these as test plugs and if they work out I might spend the money cause my Orginals seen better days
     

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  13. wheezyglider

    wheezyglider Active Member

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    upload_2021-7-29_13-22-17.png
    Wait. What does it mean again when the IC codes are "permanent" but not current?
     
  14. Gasketblower

    Gasketblower Junior Member

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    That I have to figure out too! I changed coils today with some after market ones I got off amazon for 95$ the super loud knock I was hearing is now gone the car sometimes still rattles and I have cylinder 3 misfire pending code, but over all its running much better I also put some premium fuel cleaner into it!
     

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  15. Gasketblower

    Gasketblower Junior Member

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    Now I am getting misfires on 3 of my cylinders not sure Wth is going on anymore
     

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  16. Daniel Richard

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    Did you double check your timing marks?
     
  17. Daniel Richard

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    I would buy a boroscope and check inside the cylinders. You may still have coolant coming in the cylinders.
     
  18. Gasketblower

    Gasketblower Junior Member

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    Thanks for all that tried to help but the problem was with my injectors and possibly stucK EGR all good now
     
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