Are the 6.6 l8t engines inherently noisy?

DuckBoi · May 10, 2023

As in do they all just tick a lot out the gate and make a ton of ticking noises as rpm's increase? Or are the majority of them out there pretty quiet when listening to the engine by the engine bay? I know of the typical lifter tick but curious how much noise is normal for these new engines.

Jettech1 · May 11, 2023

3 hours ago, DuckBoi said:

As in do they all just tick a lot out the gate and make a ton of ticking noises as rpm's increase? Or are the majority of them out there pretty quiet when listening to the engine by the engine bay? I know of the typical lifter tick but curious how much noise is normal for these new engines.

I don't know about others but mine is quiet and silky smooth.

DuckBoi · May 11, 2023

6 minutes ago, Jettech1 said:

I don't know about others but mine is quiet and silky smooth.

I wonder if something is up with mine. When letting it warm up, its noisy. And after driving for a while, i can rev it to 1700 rpm and theres a very loud noise coming from the engine that doesnt sound normal. Not even 3k miles yet. Its pretty damn noisy and does seem to skip and dip in rpms causing an intermittent shake of the whole truck.

Jettech1 · May 11, 2023

1 minute ago, DuckBoi said:

I wonder if something is up with mine. When letting it warm up, its noisy. And after driving for a while, i can rev it to 1700 rpm and theres a very loud noise coming from the engine that doesnt sound normal. Not even 3k miles yet. Its pretty damn noisy and does seem to skip and dip in rpms causing an intermittent shake of the whole truck.

I think I would definitely make a dealer appt. That doesn't sound right at all.

DuckBoi · May 11, 2023

1 hour ago, Jettech1 said:

I think I would definitely make a dealer appt. That doesn't sound right at all.

Hmm. Yours is 100% silent in the drivetrain? Its not any knocking noise or anything and the stumbles feel like your typical rpm stumble when the ac compressor kicks on or off for example. But it is an audible and noticeable noise. I only notice it with the door open. I hear no noise inside the cab. It only happens when the engine is hot, too. So i dont know if this is normal or not still. Maybe its in correlation to when the dealer overfilled my oil and that caused damage?

Jettech1 · May 11, 2023

9 minutes ago, DuckBoi said:

Hmm. Yours is 100% silent in the drivetrain? Its not any knocking noise or anything and the stumbles feel like your typical rpm stumble when the ac compressor kicks on or off for example. But it is an audible and noticeable noise. I only notice it with the door open. I hear no noise inside the cab. It only happens when the engine is hot, too. So i dont know if this is normal or not still. Maybe its in correlation to when the dealer overfilled my oil and that caused damage?

0 Noise. That engine is smooth as silk. That's why I said if yours is making noise I would probably make an appt with my local dealer. No noise, no hitching, A/C compressor on and off, still a smooth transition. No ticking, ummmm nothing actually.....perhaps @Pryme will give his 2 cents as well. But mine is quiet and smooth...100%. Hot/cold...no difference.

Edited May 11, 2023 by Jettech1

DuckBoi · May 11, 2023

1 minute ago, Jettech1 said:

0 Noise. That engine is smooth as silk. That's why I said if yours is making noise I would probably make an appt with my local dealer. No noise, no hitching, A/C compressor on and off, still a smooth transition. No ticking, ummmm nothing actually.....perhaps @Pryme will give his 2 cents as well. But mine is quiet and smooth...100%. Hot/cold...no difference.

Interesting. Dealers are a little over an hour away and they are iffy, techs are a bit dumb and i dont trust them but ill see what I can do. This is my second issue with a new GM truck engine related within a year.

Jettech1 · May 11, 2023

5 minutes ago, DuckBoi said:

Interesting. Dealers are a little over an hour away and they are iffy, techs are a bit dumb and i dont trust them but ill see what I can do. This is my second issue with a new GM truck engine related within a year.

For me making an appt with a dealer is even more painful and stressful then making an appt with a dentist. You know it's going to hurt either way!! Either way good luck and I hope you get it figured out soon.

Edited May 11, 2023 by Jettech1

DuckBoi · May 11, 2023

3 minutes ago, Jettech1 said:

For me making an appt with a dealer is even more painful and stressful then making an appt with a dentist. You know it's going to hurt either way!! Either way good luck and I hope you get it figured out soon.

Thank you! I appreciate it.

IDBrett · May 11, 2023

At almost 600 miles and very quiet. One of the many things that have impressed me with the truck. My 2 cents worth.....

Pryme · May 11, 2023

No noise like that that I’ve ever experienced with my truck.
I would certainly get it in. How much oil did they overfill and how long was it in there?
maybe record a video and post it here?

Edited May 11, 2023 by Pryme

DuckBoi · May 11, 2023

3 hours ago, Pryme said:

No noise like that that I’ve ever experienced with my truck.
I would certainly get it in. How much oil did they overfill and how long was it in there?
maybe record a video and post it here?

Confirmed engine is misfiring, maybe on two cylinders, continuous misfires not intermittent. All three cats glow purple/red hot after short distance drives like 10 min drives maybe and just from idling. Very audible and loud ticking noises from the engine. Trucks not even fully broken in yet. Oil reeks in pure gasoline smell on the dipstick. No check engine light but you can feel it misfire sitting in the truck and you can hear the engine stumble and can see the rpm's stumble. Didnt do this before until after my first oil change which the dealer themselves did.

Edit: dealer overfilled it so much that it was an inch and a half maybe two inches past full and was up to the wire part on the dipstick. I have pics of all this to show the dealer. Just doesnt seem good at all.

Edited May 11, 2023 by DuckBoi

Flatus · May 11, 2023

I hear the normal direct injection rapid tick but nothing other than that. I only hear that when standing outside near the truck.

DuckBoi · May 11, 2023

36 minutes ago, Flatus said:

I hear the normal direct injection rapid tick but nothing other than that. I only hear that when standing outside near the truck.

Nah mines more comparable to lifter noise or a rod bearing preparing to spin itself or a bent rod tapping the heads hard to describe but it isn't normal.