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Cold start engine knock

Discussion in 'Ask An Owner Operator' started by Keepforgettingmypassword, Oct 19, 2022.

  1. Oct 19, 2022 #1
    Keepforgettingmypassword

    Keepforgettingmypassword Heavy Load Member

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    I let it sit for 2 or 3 rainy days. I fired it up and it knocked about 6 times. Also a sinificant amount of decrease in mpg.
    Could these 2 be related?
     
    Keepforgettingmypassword, Oct 19, 2022
    Keepforgettingmypassword, Oct 19, 2022
    #1
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  3. Oct 19, 2022 #2
    Judge

    Judge Road Train Member

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    mainly the cause is either carbon buildup, valve, worn-out bearing piston slap, and worn-out engine parts. There are probably more, but these are well-known causes.
     
    Judge, Oct 19, 2022
    Judge, Oct 19, 2022
    #2
    Siinman and Keepforgettingmypassword Thank this.
  4. Oct 19, 2022 #3
    Brettj3876

    Brettj3876 Road Train Member

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    Engine make would be helpful
     
    Brettj3876, Oct 19, 2022
    Brettj3876, Oct 19, 2022
    #3
  5. Oct 19, 2022 #4
    Keepforgettingmypassword

    Keepforgettingmypassword Heavy Load Member

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    Thanks
     
    Keepforgettingmypassword, Oct 19, 2022
    Keepforgettingmypassword, Oct 19, 2022
    #4
  7. Oct 19, 2022 #5
    Keepforgettingmypassword

    Keepforgettingmypassword Heavy Load Member

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    2016 DD 13. 5 clynder cascadia
     
    Keepforgettingmypassword, Oct 19, 2022
    Keepforgettingmypassword, Oct 19, 2022
    #5
  8. Oct 19, 2022 #6
    W923

    W923 Road Train Member

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    Not sure about your particular engine but generally that’s a sign of injector problems and I have heard some injector knocks that you would think were metal parts hitting they sounded that bad
    Is there any smoke?
     
    W923, Oct 19, 2022
    W923, Oct 19, 2022
    #6
    loudtom, baha and Keepforgettingmypassword Thank this.
  9. Oct 19, 2022 #7
    Keepforgettingmypassword

    Keepforgettingmypassword Heavy Load Member

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    No smoke just 4 or 5 knocks then stopped. Hasn't happened again.
     
    Keepforgettingmypassword, Oct 19, 2022
    Keepforgettingmypassword, Oct 19, 2022
    #7
    W923 Thanks this.
  10. Oct 19, 2022 #8
    baha

    baha Road Train Member

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    1 over fueling injector can make sounds like you are hearing?
     
    baha, Oct 19, 2022
    baha, Oct 19, 2022
    #8
    Keepforgettingmypassword and W923 Thank this.
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