knocking during startup

Discussion in 'Trucks [ Eighteen Wheelers ]' started by ptwn1, Sep 4, 2013.

  1. ptwn1

    ptwn1 Light Load Member

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    Oct 4, 2012
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    my engine is starting to knock during startup more frequently usually ill just turn the engine off and turn it back on and it sound normal. but lately i would have to keep doing it. when i drive it there is a loss of power, the clutch fan stays on and chk engine lite comes on. then i stop turn the truck off start it back up and everything is normal again. getting worried now its happening more often anyone no the problem? 12.7 detroit
     
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  3. bull hauler

    bull hauler Medium Load Member

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    Why would u not have it in at a shop by now???? I woulda had it in the shop and stopped driving it like the first day that ###### was goin on...geez
     
  4. Heavyd

    Heavyd Road Train Member

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    You're going to have to see what code(s) are getting logged and then follow the appropriate troubleshooting. You will get fuel injector knock when and injector is going out and it is injecting too much, or too early. This is consistent with a knock that goes away like you mentioned. This would also explain the loss of power. Knocks could also be a broken piston, but that would knock all the time. Either way, like bull hauler said, the longer you wait the more you risk severe damage as a faulty injector can lead to a broken piston if it is overfueling or too advanced.
     
  5. ptwn1

    ptwn1 Light Load Member

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    how much does it cost to replace injectors
     
  6. GrapeApe

    GrapeApe Road Train Member

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    What code do you have? Hit the the ####down overide switch and it will blink 2 digit codes. Amber light will blink out inactive codes and red light will blink out active ones.
     
  7. Dorsey

    Dorsey Medium Load Member

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    I dont remember the exact price but I replaced all 6 at freightliner and it was a little over $3000 for my 12.7 detroit.
     
  8. ptwn1

    ptwn1 Light Load Member

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    #### thats a lot what is the ####down override switch
     
  9. ptwn1

    ptwn1 Light Load Member

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    ok i was counting the blinks it was going on for 2 minutes red was 2 then 6
     
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