Jump to content

Engine knock a 500 miles

bass mechanic
 Share

Recommended Posts

Colossus Senior Enthusiast

Colossus

Posted
Posted

I hope you can find help for your new one.  You might check over at duramaxforum.com as there are more diesel owners over there if you don't get anything on here.  How did your 2018 work out for you?  I'm considering upgrading to a 2018 from my 2008.  Most of the DPF and DEF issues were resolved for 2018 and 2018 doesn't have the dreaded CP4 fuel pump issue. 

  • 2 weeks later...
  • Replies 135
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

bass mechanic
bass mechanic

heres a video with the sounds  

Sask Farmboy
Sask Farmboy

My first chime in for this topic. My 2020 Denali DRW is being built in 2 weeks so I will be checking it out closely. I used to be a Chevy tech and finding stuff like this was my life. I

MN6.2
MN6.2

Didn't they have to change the back of the engine to accommodate the new 10 speed transmission? Doesn't seem like enough to create a knock like that but that is one major thing they changed. 

Posted Images

Hoss sharifi New Member

Hoss sharifi

Posted
Posted

Just picked up a 2020 silverado this morning. I have been reading this thread and another so when I got to the dealer I started the truck and the knock was there but not too bad. Drove 60 miles home (truck has 90 miles on it right now) and when I got home I opened the door with it running and it was much louder and its not a ticking noise definitely a "thumping" sound and it seems to be towards the rear of the motor. I dont like the noise but with so many saying the same thing I am not going to worry about it. If it were something major I would think GM would send out a recall, being a new model I am sure they want to protect their new baby. Other than the thump love the truck the motor feels smoother than my 19 ram 2500. 

bsmall1564 Enthusiast

bsmall1564

Posted
Posted

Congrats on your new 2020 Hoss. I feel the same as you regarding the noise I get from mine. 

I’ve put on about 6K miles towing without any issues, so I’m assuming if it were a major issue it would have shown up by now. 

 

Still love it!

  • Like 1
  • 3 weeks later...
buelldude Enthusiast

buelldude

Posted
Posted (edited)

I still keep looking for anything on this from GM, nothing. I did come across something other than the belt removal. I was watching part of the banks videos on YTUBE. The oil cooler is bigger with more cooling coils and its on the back of the engine. I'm not saying that is what it is but it is a new part put on the 20's. I have been looking at what the differences are and what could be making the noise. I started to think that cold oil going thru the cooler may not make the noise till it warms up and makes it till it cools down. Till its cold again and I don't get it when its cold. I will think things thru, that is till I either give up or find the issue. I have emailed a few places with questions and ideas and most of the time I get nothing in return????   

Edited by buelldude
  • 3 weeks later...
  • 4 weeks later...
combat1500 Enthusiast

combat1500

Posted
Posted
On 11/23/2020 at 4:16 PM, David Nichols said:

I just bought a 2021 same problem the knock is annoying as hell my 18 did not do this and same thing the dealer says it normal I have 80 miles on this thing I’m not happy at all 

I know the feeling man... We need to get a petition going. 

Crazy how everyone gets home with a brand new truck from the dealer and hears the loud knock.

 

 

BernieDoodle New Member

BernieDoodle

Posted
Posted

I just bought a brand new 2021 Duramax Z71. There was someone else on the way to look at it and I had to act fast. All local dealers were selling them as soon as they came in. The dealer I bought it from was on a busy highway with a lot of noise. When I got it home I noticed a knocking noise. I took it to three local Chevy dealers and had mechanics listen to it. It is pretty loud and obvious but they would not say it was abnormal. To me this  is unacceptable. I noticed there is even a bulletin about it online. This is a $70,000 plus vehicle. Come on GM. What are you going to do about this? There should be a recall or something. Sounds like I'm not the only one unhappy about this.

Colossus Senior Enthusiast

Colossus

Posted
Posted

It is normal to them so obviously they are not going to do anything.  Trade it in on a Crapota I guess??

  • 2 weeks later...
Goomba New Member

Goomba

Posted
Posted

I also recently purchased a 2020 3500 and I have 7116 miles on it already and I have been hearing this knock sound and took it to the first oil change and i feel like it just got louder. Hate the sound but i can live with it it’s just embarrassing to park next to all my guys having the newest truck and all of them asking what’s wrong with your truck having problems already. :(

dipstick New Member

dipstick

Posted
Posted

Have any of you guys changed your oil yourself?  Well I just changed mine at 3200 miles 2020 Duramax. When I fired it up that knock/thump sound just multiplied about 20X until the oil filter filled up and oil started to circulate.  Way more noise than any oil change I've ever done  It sounded like a knock and not a thump at that point.  I felt like damage was in progress while waiting for oil pressure to build.  Change the oil filter to hear for yourself.

Tomato Enthusiast

Tomato

Posted
Posted
2 hours ago, dipstick said:

Have any of you guys changed your oil yourself?  Well I just changed mine at 3200 miles 2020 Duramax. When I fired it up that knock/thump sound just multiplied about 20X until the oil filter filled up and oil started to circulate.  Way more noise than any oil change I've ever done  It sounded like a knock and not a thump at that point.  I felt like damage was in progress while waiting for oil pressure to build.  Change the oil filter to hear for yourself.

That is not encouraging...I think we all agree that the sound is there for a second at cold start up, then oil pressure builds and it quiets until the engine is warm. Oil pressure is highest when cold, obviously.  Definitely seems to tap at engine/crank RPM/speed as well.

 

I am shocked that no one here on the forum has posted definitively about the belt removal test. A before and after video would be great.

 

I had emailed Banks a long time ago given their intimacy with the Duramax - never got a response...Pissed me off, as I am a customer, and that request got me added to their email ad list, but never got a response to my inquiry. Thanks, Banks.

bsmall1564 Enthusiast

bsmall1564

Posted
Posted (edited)
12 hours ago, dipstick said:

Have any of you guys changed your oil yourself?  Well I just changed mine at 3200 miles 2020 Duramax. When I fired it up that knock/thump sound just multiplied about 20X until the oil filter filled up and oil started to circulate.  Way more noise than any oil change I've ever done  It sounded like a knock and not a thump at that point.  I felt like damage was in progress while waiting for oil pressure to build.  Change the oil filter to hear for yourself.

That's exactly what I experienced when I changed my oil & filter.  So I thought just maybe the AcDelco Filter wasn't doing a very good job related to the pressure creating the noise.  So the next oil & filter change I used an AmsOil filter and was a little quieter regarding the thumping/knocking noise upon start up, but was still present.  So the following oil change I went back to using the AcDelco.

I just figure its just a characteristic trait to the L5P Engine.  Currently I have about 10K miles of towing with it and everything is great.

Edited by bsmall1564
spelling

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

    342,782
    Total Members
    8,960
    Most Online
    ShowMeShooter1332
    Newest Member
    ShowMeShooter1332
    Joined

  • Who's Online   1 Member, 0 Anonymous, 5,695 Guests (See full list)

  • Latest Articles

  • Posts

    • Jsdirt
      2027 GMC Sierra: Official Discussion

      By Jsdirt · Posted

      I was around and remember that era very well, so I'm calling b/s on that statement. If they were that bad no police department or taxi company would've bought a single one ... but they were used in both services (and fire) for DECADES. They were bulletproof and proven. Even the early 21st century ones weren't too bad! The early models were legendary.   Mine is proof, but people like atlas are blinded by agenda and refuse to believe facts right before their very eyes.   Even decades after they were built, a new generation started driving them, posting all their builds and shenanigans on Grandmarq.net and Crownvic.net. The failures would show up then, since they all were deep past 100k-150k miles by that point, and younger drivers tend to be a little aggressive, especially with vehicles than can lay a one-tire fire for as long as you hold your foot in it. They've more than proven themselves over the decades.   The only thing that'll really take them out is road salt. The bodies and sheet metal were garbage. A victim of the cheapout FoMoCo and GM have been partaking in before then, and since.   Today it's the stuff that counts - the undercarriage that rots away first!    GMs Caprice was no slouch either. Reliable as a stone ax - the opposite of what they build now.    
    • Jsdirt
      2027 GMC Sierra: Official Discussion

      By Jsdirt · Posted

      Let me know how your vehicles do in 10 years. You don't know ******, kid. 😂    There's a reason that Panther platform was used as police, fire, and taxi service for DECADES ... long before you were born, apparently.
    • davester
      Disconnecting Battery

      By davester · Posted

      If your connector also has a big lever to get the connector on and off, you don't want to force the lever either way, as it becomes a bigger problem if you bust the lever or the mechanism it works.
    • davester
      Disconnecting Battery

      By davester · Posted

      It's just useful to disconnect the battery to prevent odd shorting out when unplugging/plugging stuff together.  I also  touch the two cable ends together (after disonnecting) to drain the small amount of stored battery energy in various modules.   I believe the main system where you need to be more concerned with, so you need to do the above and then wait some time, iss when you are working on the air bag system, to prevent inadvertent firing of the air bags.   The in-cab switches are just that, plain switches, it's generally not a problem to swap them in/out.  For my '12, I'll get an error message on the dash if I power up the truck w them unplugged, but that's it (power up= turn the ignition on).   The ITBC located above the spare tire is a computer that manages the trailer brake system.  That is probably more important to have the battery disconnected.  It does have to be programmed to the truck, either before or after it's installed, for it to work.  For my '12, I had a very hard time reinstalling the main connector to it (IDK if yours is the same or not), it turned out the silicon seal was jamming up, preventing it from going on all the way.  I finally got it fully installed by lubing the seal with a bit of dielectric grease, then it slid on and latched in place easily.
    • BCGM
      Remote Start Noise 2024 2500 HD Gas

      By BCGM · Posted

      JR ! I just got the truck back from the Dealership today . The technician did a cold remote start on the truck this morning and it made the noise . It was determined that it was a starter issue and replaced it under warranty . Of course   it did not make the sound after a new starter was put in because the truck was not cold . We will we see what happens tomorrow morning when I start the truck cold  . Keep tuned !   Oh I found a video on YouTube of a cold start and it did the same thing your truck and mine do , I will see if I can find it and post it up

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...