Jump to content

Are the 6.6 l8t engines inherently noisy?

DuckBoi

By DuckBoi
in 6.6L Gas V8 (L8T)

 Share

Recommended Posts

CRApex Enthusiast

CRApex

Posted
Posted
21 hours ago, DuckBoi said:

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. 

Sounds like the tech was dreaming of a Duramax when he filled your oil back up.  That's a bummer. 

  • Replies 48
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

DuckBoi
DuckBoi

Dealer has truck. Will update this thread when i hear back. 

Jettech1
Jettech1

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

DuckBoi
DuckBoi

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 idli

Posted Images

DuckBoi Enthusiast

DuckBoi

Posted
  • Author
Posted
3 hours ago, CRApex said:

Sounds like the tech was dreaming of a Duramax when he filled your oil back up.  That's a bummer. 

Lmao hopefully he didnt put in 15w40 oil too!

C/K Man Enthusiast

C/K Man

Posted
Posted

Oil smells like gasoline and it's above full?  Sounds like the high pressure fuel pump failed.  Certainly could cause a miss too.

DuckBoi Enthusiast

DuckBoi

Posted
  • Author
Posted
5 hours ago, C/K Man said:

Oil smells like gasoline and it's above full?  Sounds like the high pressure fuel pump failed.  Certainly could cause a miss too.

At 2800 miles?

DuckBoi Enthusiast

DuckBoi

Posted
  • Author
Posted
3 hours ago, Pryme said:

Any updates?

Heard nothing from the dealer so far.  Dont know whats taking them so long honestly.  But it is annoying. 

  • Confused 1
Pryme Senior Enthusiast

Pryme

Posted
Posted
1 hour ago, DuckBoi said:

Heard nothing from the dealer so far.  Dont know whats taking them so long honestly.  But it is annoying. 

Yeah that’s BS. Auto companies are making their warranties next to worthless by just making the service so painfully slow or hard to access. It’s all by plan of course. 
 

an independent shop would probably have an answer in a few hours. 

DuckBoi Enthusiast

DuckBoi

Posted
  • Author
Posted
29 minutes ago, Pryme said:

Yeah that’s BS. Auto companies are making their warranties next to worthless by just making the service so painfully slow or hard to access. It’s all by plan of course. 
 

an independent shop would probably have an answer in a few hours. 

Im hoping i hear something by today as we are going into the weekend and they are closed on weekends.  This is annoying and BS.  Truck doesnt even have 3k miles!!! And already without it. 

Stand By Enthusiast

Stand By

Posted
Posted

Early on, 2019-2020, there was a lifter bulletin for some 6.2 and 6.6 engines depending on the date they were built. Maybe something is showing itself again?

DuckBoi Enthusiast

DuckBoi

Posted
  • Author
Posted
1 hour ago, Stand By said:

Early on, 2019-2020, there was a lifter bulletin for some 6.2 and 6.6 engines depending on the date they were built. Maybe something is showing itself again?

What was this regarding?  6.6 engines dont have afm/dfm but i saw the 6.2 engines had a bulletin for faulty afm/dfm lifters. 

  • 1 month later...
Dustin Marshall Enthusiast

Dustin Marshall

Posted
Posted
On 5/10/2023 at 9:18 PM, 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.

 

Chiming in to report another 6.6L L8T that is silky smooth (cold / warm).

 

Hope OP gets issue resolved.

Keep us updated!!  Good luck on getting issue resolved.

Pryme Senior Enthusiast

Pryme

Posted
Posted
On 5/20/2023 at 1:44 PM, DuckBoi said:

What was this regarding?  6.6 engines dont have afm/dfm but i saw the 6.2 engines had a bulletin for faulty afm/dfm lifters. 

Whatever happened with this?

  • 2 weeks later...
MacLaren Enthusiast

MacLaren

Posted
Posted
On 5/10/2023 at 8:56 PM, Jettech1 said:

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

+1

 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,778
    Total Members
    8,960
    Most Online
    daveishi
    Newest Member
    daveishi
    Joined

  • Who's Online   3 Members, 0 Anonymous, 1,135 Guests (See full list)

  • Latest Articles

  • Posts

    • Jsdirt
      2027 GMC Sierra: Official Discussion

      By Jsdirt · Posted

      Because that is IDIOTIC, much like this question. They've already been forced to do it by past administrations - why would you roll that back when it's a GOOD thing?  WHO IS ARGUING FOR LOWER MILEAGE???? 😂  NOBODY IS!!   I'm certainly not! What I want is RELIABLE vehicles again that are worth the price paid!    I don't get your logic here ...   In 2003 I paid $2,200 for our '86 Grand Marquis. It's STILL running and I've never been inside the engine, aside for the timing cover since it was leaking, so I threw a new timing set in since that makes sense. Transmission is ORIGINAL. Electric pump in the gas tank is ORIGINAL. Rear end is ORIGINAL. I'd have to hit my head REAL hard to want to pay $60k or more for a car that still can't come close to the comfort, seating and storage space, or reliability of this one. Nothing is even in the ball park! Hundreds of thousands of brands and models have been built and sent to the crusher while this one keeps on going!   https://postimg.cc/Z9XRrCSg   I've got a whole fleet of cars, motorcycles, and a truck close to this age for summer and winter. No one could pay me enough to buy anything built this century. I have zero use for any it.
    • Jsdirt
      2027 GMC Sierra: Official Discussion

      By Jsdirt · Posted

      Since I'm the one who has to fix them when they break, I'll take vehicles over 30 years old all day, EVERY day, over ANY modern crap. Have you attempted any repairs on anything built after 2006? It's a friggin nightmare, and gets worse the newer the model year.    If I had the will or desire, I can make any car of any age outside of a Model T (I don't have THAT much will ...) just as powerful, comfortable, and have all the tech the new stuff does, and get pretty close in mileage, too. I prefer SIMPLICITY. The less the vehicle has, the less to fix WHEN it breaks, not IF.   I'm glad you snot-nosed punks don't like them. More for us, plus that keeps the prices from climbing more than they already have.👍
    • cautious optimist
      2027 GMC Sierra: Official Discussion

      By cautious optimist · Posted

      Bringing this thread back on topic. I just noticed the incredible lack of bright chrome across the entire new lineup. Even the Denali has tinted the brightwork in the grille and has none elsewhere. None of them have chrome bumpers. As far as I can tell there aren't even chrome mirror caps. I'm curious if this also happens out back? Are there no chrome rear bumpers either? This is quite the departure for GMC.
    • cautious optimist
      2027 GMC Sierra: Official Discussion

      By cautious optimist · Posted

      Bringing this thread back on topic. I just noticed the incredible lack of bright chrome across the entire new lineup. Even the Denali has tinted the brightwork in the grille and has none elsewhere. None of them have chrome bumpers. As far as I can tell there aren't even chrome mirror caps. I'm curious if this also happens out back? Are there no chrome rear bumpers either? This is quite the departure for GMC.
    • cautious optimist
      2027 GMC Sierra: Official Discussion

      By cautious optimist · Posted

      Bringing this thread back on topic. I just noticed the incredible lack of bright chrome across the entire new lineup. Even the Denali has tinted the brightwork in the grille and has none elsewhere. None of them have chrome bumpers. As far as I can tell there aren't even chrome mirror caps. I'm curious if this also happens out back? Are there no chrome rear bumpers either? This is quite the departure for GMC.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...