Originally Posted by chevy71pickupman View Post
It's not timing rattle it is probably a fuel rattle. It is very hard to get timing rattle in a diesel. I had the same problem with a set of my tunes and I never did figure out what was causing it.
Timing rattle IS caused by the fuel in a diesel.
Too advanced initial timing can cause this or the effect from ramping the pressure in too fast causing a increase in the dynamic timing of the motor.
We could also get into transiant timing as well.....again, a timing setting problem based on transient load.
Timing Rattle can also be worsened from poor quality, low cetane fuel that doesn't burn as smoothly. This resulting in pressure spikes in the cylinder..more of a explosion than a controlled burn.
Anyhow, I really doubt it's advanced timing in Rob's tune, he's VERY VERY consevative on timing...but there could be a error.
Usually other issues like EGT problems show up from that, especially on bigger tunes.
Go back to Rob and give him the chance work it out for you..
Call me tomorrow and we can log the truck. Have you tried contacting us before or was this the first time by making the thread? Sent from my iPhone using AutoGuide.com App
OP, It's always good to try contacting the tuner first...Dustin will get you squared away, hopefully at no cost.