LLY: lifter chatter?

[hddieselguy85]

Hi I have an 05 chevy duramax, lly. The other morning I noticed a little chatter in lower rpm when it was down shifting from 5th to 4th on a hill. Then this morning there was a slight chatter at around 2000 rpm but the truck was cold ( it was around 15 out and the truck wasn't warmed up yet) but this afternoon on the way home the chattering was load, iv never heard it like this before, I would only hear it around 2000 rpm again. The truck has only 53k on it as well and I baby it. Theres no tuner and everything is stock but the egr delete kit. I just want to know what could be wrong or is this normal? thanks guys for any help.

 

[Burn Down]

Welcome!

Try running some fuel additive, optilube or 2-stroke oil. Do you have a way to read the injectors?

 

[TLyons90]

Dumb question but when is the last time you checked and or changed your oil? Also your fuel filter?

 

[ALLY Fox]

Sounds like your pilot injection may be turning off early. Pilot injection is what makes Duramaxes not sound like Cummins 12 Vs or Furd 7.3s.....

 

[hddieselguy85]

just had an oil change about a month ago, and I checked it and it looks good. Ya I do have a buddy that can read the injectors for me. ill look into the pilot injection as well, thanks guys.

 

[02greysixer]

May want to read up up on "ice pick injectors". You may have an injector plug not making a perfect connection. It's a free thing to try, just takes time. Harness issues are fairly common and can cause some weird noises on 04.5-05 trucks

Sent from my SAMSUNG-SGH-I337 using Tapatalk

 

[blitzin247]

Also, no one has mentioned it, but sometimes the flex plates break causing noise as well too. I would obviously try all of these other things first because there is only a small chance its the flex plate because its intermittent.