Got 650 miles on the clock now, and I'm wondering if those of you who've had your truck a while can answer this, or have experienced it. I know these trucks up shift quickly for fuel economy sake. I mean it seems like this thing is in 5th or 6th by the time I hit 35 MPH! So anyway at times when I'm driving at steady speed, RPM's low, and accelerate lightly I hear what sounds to me like pinging? If I give it pedal it accelerates fine, especially when it downshifts.

I know this is dumb, but not having a diesel before I was wondering if it is in fact pinging, or is it something else? The reason I ask that, is because the engine sounds fine and it almost seems like a separate sound. If it's slight pinging is it hurting anything? Does it just need to adapt to my driving? Not sure what to think and I'm just paranoid I guess and was looking for reassurance. Thanks.

 

Would a typewriter (tick tick tick tick tick [pause] tick tick tick tick tick...) be closer to what you are hearing or is it an actual ping type noise?

I bring this up because a lot of these engines tick when new, especially after t he first oil change.

 

The oil hasn't been changed yet, and shoot, it's hard to describe noises I guess, but it doesn't sound like a tick, and doesn't do it any other time except like I said on light acceleration. It's not loud at all either. I'm not overly worried (yet), just curious.

On edit: after thinking about it, it's kinda like a light rattle.

 

Diesels run on what's called Compression Ignition. What you are hearing is the detonation of the fuel. In a gasoline engine that is detonating, you hear a similar pinging. The only difference is that the diesel is made to absorb the impact of those detonations and to make the most use of that shock and pressure wave through efficient piston and combustion chamber design. Gassers just start tearing themselves apart when they are detonating..

That said - these 6.7's are a lot quieter than the earlier diesels.. It's a number of things that make them quieter and there are also new features to the cab, windshield and insulation that help a lot...

My 2015 has been rattling more lately. Almost a typwriter sound. It has not had its first oil change, but I checked the oil and it is down a quart. That should not cause any issues, but I will probably add a quart to get it to at least a few thousand miles before I change it.. It has 1800 on it now...

 

Thanks Randy. That helps, I won't worry about it.

A quart down after only 1800 miles!? Is that normal?

 

Mine used a little on the first oil run. It has since not used or made any.


Do weekly fluid checks!

 

22 - I think I have heard the same sound you have heard. I always just attributed it to the injectors cycling more per stroke. They can inject fuel up to 4 times (I believe) per stroke.

I have one spot near me where it happens pretty frequently and I don't have to push on the accelerator. What does happen though is the hill gets progressively steeper when it happens. It would be interesting to know if the engine controls are tied to the pitch and roll sensors.