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Thread: Injector/diesel knock under light throttle

  1. #1
    New Member
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    Default Injector/diesel knock under light throttle

    I'm needing help trying to figure out where/why I have this injector knock issue,
    I can't seem to figure it out, runs amazing at wot, no knock when u first start it, then when warm it knocks BAD under partial throttle (ie: cruising on highway) no knock at idle, and no knock when floored, if I kick overdrive off it seems to stop knocking as well, I'm lost need help...... it's heavily modified, 05 LLY, new 10mm stroker pump (exergy), 30% sticks (new reman less than 500miles), egr delete, manifolds and up pipes (highflow), 63mm fleece fmw, downpipe, pcv reroute, hsp mouthpiece, intake tube and air cleaner, pusher y-bridge, fuel rail plug, 165gph airdogg 4g2, 1/2" feed fitting to cp3 12 to 15 psi idle, efi with dsp5, 6" lift, 36x14.5x16.5 rubber,

  2. #2
    Lifetime Member comnrailpwr's Avatar
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    Jun 2011
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    Default

    I had a problem on an lly that had knock. Could not figure it out. It wasn't modified truck but had a pile of miles. Injectors were new stock. Ended up being in the rail pressure tables. If I remember right I just smoothed out the stock tables and that was enough to cause it. It only knocked under light throttle and cruising. Not extreme but noticable. Put RP tables back to stock if they aren't and start there.

    Sent from my SM-G960U using Tapatalk

  3. #3
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    Would anyone be willing to look at some data logs?

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