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knocking or slapping noise 05 volvo ved12. please help!!!!!

Discussion in 'Volvo Forum' started by Dickeyroberts, Jul 9, 2014.

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  1. Jul 9, 2014 #1
    Dickeyroberts

    Dickeyroberts Light Load Member

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    I last drove my truck a week ago today and it was fine. No noise and ran great. checked my oil today and it was full. started my truck up today and its making a knocking noise. if I rev it a bit and get to 1200 rpms it goes away but comes back after its lower than 1200 rpms. kind of running crappy too. its not blowing any smoke. Anyone have this same problem with their truck. any help would be greatly appreciated. 05 Volvo with a ved 12 and it has 739000 miles on it. the mechanic at the garage I park at said he thinks it might be a bad injector and that it has a dead cylinder. Could that be right? Im panicking here!
     
    Dickeyroberts, Jul 9, 2014
    Dickeyroberts, Jul 9, 2014
    #1
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  3. Jul 9, 2014 #2
    Dickeyroberts

    Dickeyroberts Light Load Member

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    I also forgot to mention that there is no codes or check engine light on
     
    Dickeyroberts, Jul 9, 2014
    Dickeyroberts, Jul 9, 2014
    #2
  4. Jul 9, 2014 #3
    Scania man

    Scania man Road Train Member

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    Scania man, Jul 9, 2014
    Scania man, Jul 9, 2014
    #3
    Dickeyroberts Thanks this.
  5. Jul 9, 2014 #4
    Dickeyroberts

    Dickeyroberts Light Load Member

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    Thank you very much. I sure will
     
    Dickeyroberts, Jul 9, 2014
    Dickeyroberts, Jul 9, 2014
    #4
  7. Jul 9, 2014 #5
    CondoCruiser

    CondoCruiser The Legend

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    If it's not blowing smoke is a good sign. If the mains were shot the cylinders take on an egg shape, wear the rings out and you'll get blow by and burn oil. It's probably a dead cylinder like he said.
     
    CondoCruiser, Jul 9, 2014
    CondoCruiser, Jul 9, 2014
    #5
    Dickeyroberts Thanks this.
  8. Jul 9, 2014 #6
    Dickeyroberts

    Dickeyroberts Light Load Member

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    Thanks condo cruiser! You made me feel a lot better!
     
    Dickeyroberts, Jul 9, 2014
    Dickeyroberts, Jul 9, 2014
    #6
  9. Jul 9, 2014 #7
    Duramaxxed

    Duramaxxed Light Load Member

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    Bourbonnais, IL
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    Does it have Jakes on it? Sometimes the leaf spring breaks and causes the engine brake rocker arm slap between valve bridge and the cam lobe. Super common if it's been a while since an overhead set. Also could be a cam issue. No smoke tells me it's probably not an egr or fuel issue. Usually if it is knocking due to injector it would be smoking white. Same with a stuck open egr causing overfueling, you can smell fuel.
     
    Duramaxxed, Jul 9, 2014
    Duramaxxed, Jul 9, 2014
    #7
    KB3MMX and Dickeyroberts Thank this.
  10. Jul 9, 2014 #8
    Dickeyroberts

    Dickeyroberts Light Load Member

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    Yeah it does have a jake on it.
     
    Dickeyroberts, Jul 9, 2014
    Dickeyroberts, Jul 9, 2014
    #8
  11. Jul 9, 2014 #9
    Duramaxxed

    Duramaxxed Light Load Member

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    Bourbonnais, IL
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    If the noise sounds like it's under the valve cover check the leaf springs. Keeps the rocker from slapping.
     
    Duramaxxed, Jul 9, 2014
    Duramaxxed, Jul 9, 2014
    #9
    KB3MMX and Dickeyroberts Thank this.
  12. Jul 9, 2014 #10
    Dickeyroberts

    Dickeyroberts Light Load Member

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    Is that expensive fix duramaxxed?
     
    Dickeyroberts, Jul 9, 2014
    Dickeyroberts, Jul 9, 2014
    #10
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