How loud is your Duramax?

Dudeguyman · Oct 28, 2023

I’ve been putting in the AC Delco Diesel fuel additive recently (fuel conditioner manual recommends) and it’s been quieting down the injectors completely, night and day difference. I got an injector relearn when I got my NOx sensor replaced which fixed the issue before but came back after about 1K miles. Quieting the injectors down for $20 per fill up kind of sucks though.

JDAT4X · Jan 24, 2024

Have a 24’ AT4X and it’s pretty loud at idle and initial acceleration from a stop 100% knows it’s a diesel except at cruising speed where it’s almost silent. Diesel Rattle and sounds like sucking air (turbo spin up?). Louder than test drive vehicle, 5x louder than Diesel X5 - actually annoying to me.

pinebaron · Jan 24, 2024

JDAT4X said:
Have a 24’ AT4X and it’s pretty loud at idle and initial acceleration from a stop 100% knows it’s a diesel except at cruising speed where it’s almost silent. Diesel Rattle and sounds like sucking air (turbo spin up?). Louder than test drive vehicle, 5x louder than Diesel X5 - actually annoying to me.

I'm surprised, My 2024 2500HD AT4X 6.6L Duramax is pretty quiet for a large diesel; I hardly notice the engine in the cab. I always loved diesels. My Mercedes 3.0 V6 diesel is very quiet. I know my 2023 John Deer X758 with 24hp 993cc diesel engine makes its presence known; I wear noise reducing head gear while operating it

Cocoabean · Jan 24, 2024

JDAT4X said:
Have a 24’ AT4X and it’s pretty loud at idle and initial acceleration from a stop 100% knows it’s a diesel except at cruising speed where it’s almost silent. Diesel Rattle and sounds like sucking air (turbo spin up?). Louder than test drive vehicle, 5x louder than Diesel X5 - actually annoying to me.

I have the 3.0l and can hear the diesel when my windows are down, but its hardly noticeable when windows are up. I love the sound of the diesel, so I don't mind the mild sound of it at all.

You might try the Hotshots EDT. It will quiet the diesel down a little.

pinebaron · Jan 24, 2024

Cocoabean said:
I have the 3.0l and can hear the diesel when my windows are down, but its hardly noticeable when windows are up. I love the sound of the diesel, so I don't mind the mild sound of it at all.

You might try the Hotshots EDT. It will quiet the diesel down a little.

Thanks. I will try that today and in my JD at spring time.

GLW · Jan 24, 2024

JDAT4X said:
Have a 24’ AT4X and it’s pretty loud at idle and initial acceleration from a stop 100% knows it’s a diesel except at cruising speed where it’s almost silent. Diesel Rattle and sounds like sucking air (turbo spin up?). Louder than test drive vehicle, 5x louder than Diesel X5 - actually annoying to me.

I have the 2023 3.0L TurboDeisel and it is quiet most of the time. I run Archoil in it to increase cetane. It has a weird sound mostly when cold but sometimes not, sounds like the skid plate under the truck is vibrating. Happens at 1800-2200 rpm only.

JDAT4X · Jan 24, 2024

pinebaron said:
I'm surprised, My 2024 2500HD AT4X 6.6L Duramax is pretty quiet for a large diesel; I hardly notice the engine in the cab. I always loved diesels. My Mercedes 3.0 V6 diesel is very quiet. I know my 2023 John Deer X758 with 24hp 993cc diesel engine makes its presence known; I wear noise reducing head gear while operating it

Have a turbo diesel X5 and you don’t even know it’s diesel except the torque will pull a house of its foundation - only needs DEF every 10K miles.

I’ve been around diesels more whole life (ranch life - parents owned a trucking company) - so the typical diesel isn’t an issue - at initial acceleration its diesel rail I call “ rattle”, the addition of whoosh of air sucking sound and quick shift to 2nd drags down rpm a bit making a whine. Seems everyone has a different experience with same vehicle same LZO…..if accelerator in park - super quiet - and above 30mph, even heavy acceleration - super quiet.