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Thread: Knock after tune

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    Basic Member Painter14's Avatar

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    Knock after tune

    Hey guys.
    2014 6.7 efi tow tune and trans tune 68RFE. Full delete. 5 tb.
    i had a trans tune written so my tow tune had to be reflashed. After the reflash I seem to have picked up an engine tap or knock at idle. This is after engine is warm. Runs great, no smoke and good mileage. Is this something to be concerned about?
    thanks in advance.


  2. Top Of Page | #2
    TexNeck's Avatar

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    Re: Knock after tune

    Is this consistent for all the tunes if you have a switch?

    2013 Ram 2500
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  3. Top Of Page | #3
    Basic Member Painter14's Avatar

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    Re: Knock after tune

    Only the single tune. I only hear it at idle.


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    allbizns's Avatar

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    Re: Knock after tune

    I have read somewhere else that guys running some tuning other than Ray's have just noticed a similar sound with a tune update. They had referred to it as Rail Rattle. The explaination was they were supplying extra fuel and what you are hearing is the fuel in the rail in low boost situations. They claim it also part of smoke control as well. Not sure if this is true or not just passing along some info I read. My advice would be to contact the tuner you used and see what they have to say.

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  5. Top Of Page | #5
    TexNeck's Avatar

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    Re: Knock after tune

    Theres another thread with @Painter14 “slight lope after delete” he’s got a single EFI tow tune. Had sound at idle - he reloaded the tune and it solved his issue - it’s in the engine management section and only 6 days old

    2013 Ram 2500
    John 3:16 - Philippians 4:13

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