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Cold start one second long awful engine sound

Jettech1

By Jettech1
in 6.6L Gas V8 (L8T)

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Jettech1 Senior Enthusiast

Jettech1

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2022 2500 Chevy gasser......I know this topic has been discussed before, and I know GM said all is good. BUT, I never had that terrible sound until I had the oil changed at the dealer at 2500 miles.  Ever since then, every time I do a cold start I hear this, of what I think, is the timing chain just rattling like heck for a second.  I've checked the oil, it's fine, the dealer of course used a GM oil filter.  There has to be a way to fix this.  I hate it and want to get rid of it, the sound that is....I love the gas engine....best engine ever.  I just want it to not make a horrific noise on start up like it did before I had the oil changed for the first time.  Any ideas how to solve that?

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newdude
newdude

Is the oil level good?  On your paperwork, is there a p/n of the oil used?  Did they install a PF-63 filter?     Can you give us a video of a cold start?   Without hearing it I'm l

sheath
sheath

Yep that's it.  Dealer told me the same as Newdude said.  So now I sit in the kitchen and remote start it while it's in the detached garage (about 40' from the house).  As Sergeant Schultz s

newdude
newdude

It will spike to high pressure on the gauge in the dash.  If you watch the oil pressure driving on these gen 5 engines, around 3500rpm the oil pressure spikes from say 40-50psi to about 70psi.  That's

SWDoodle Enthusiast

SWDoodle

Posted
Posted
1 hour ago, Jettech1 said:

2022 2500 Chevy gasser......I know this topic has been discussed before, and I know GM said all is good. BUT, I never had that terrible sound until I had the oil changed at the dealer at 2500 miles.  Ever since then, every time I do a cold start I hear this, of what I think, is the timing chain just rattling like heck for a second.  I've checked the oil, it's fine, the dealer of course used a GM oil filter.  There has to be a way to fix this.  I hate it and want to get rid of it, the sound that is....I love the gas engine....best engine ever.  I just want it to not make a horrific noise on start up like it did before I had the oil changed for the first time.  Any ideas how to solve that?

 

My 23 makes the same noise.  Sounds like it’s coming from under the cab?  No idea what it is.  Hopefully its not like the gawd awful noise my 3.5 EcoBoost used to make, but that was cam phasers.  

Flatus Enthusiast

Flatus

Posted
Posted

My 6.6 gas makes the same noise on cold starts. I explain it the same way, sounds like a timing chain rattle. I was at the dealer last week for an oil change and I brought it up but of course they didn't know what I was talking about. I couldn't leave it there for several hours for them to do a cold start to reproduce it. 

Jettech1 Senior Enthusiast

Jettech1

Posted
  • Author
Posted
1 hour ago, SWDoodle said:

 

My 23 makes the same noise.  Sounds like it’s coming from under the cab?  No idea what it is.  Hopefully its not like the gawd awful noise my 3.5 EcoBoost used to make, but that was cam phasers.  

I had the 3.5 Ecoboost in our 2019 Explorer Sport and never had a problem or noise out of it.  Now, I did my own oil changes and used Mobil 1 with the factory oil filter. 

Jettech1 Senior Enthusiast

Jettech1

Posted
  • Author
Posted (edited)
25 minutes ago, Flatus said:

My 6.6 gas makes the same noise on cold starts. I explain it the same way, sounds like a timing chain rattle. I was at the dealer last week for an oil change and I brought it up but of course they didn't know what I was talking about. I couldn't leave it there for several hours for them to do a cold start to reproduce it. 

I'm trying to figure this out...that 6.6L gasser is to die for.  I absolutely love it....But why on earth does it make that noise?  I've read that the oil filter check valve to keep it primed isn't working...I call BS on that theory.  Something changed drastically when my first oil change was done at 2500 miles...  Now what is different?  The only thing different is oil and filter.  Nothing else.  Unless GM put in some kind of additive to their oil......hmmmm...  edit again...I bet GM was using a thicker based oil.  Like a 0 or a 5W-40.....That would make sense for initial break in for an engine that is robust as this one is.

Edited by Jettech1
Flatus Enthusiast

Flatus

Posted
Posted
12 minutes ago, Jettech1 said:

I'm trying to figure this out...that 6.6L gasser is to die for.  I absolutely love it....But why on earth does it make that noise?  I've read that the oil filter check valve to keep it primed isn't working...I call BS on that theory.  Something changed drastically when my first oil change was done at 2500 miles...  Now what is different?  The only thing different is oil and filter.  Nothing else.  Unless GM put in some kind of additive to their oil......hmmmm...

I don't know. I am friends with the service manager at the dealer. I sat down with him in his office and he looked it up in the system to see if he could find any kind of bulletins describing the noise but he could not. I guess I'm just not going to worry about it for now. If it for some reason gets worse, than I will make plans to leave it with them so they can cold start it.

Jettech1 Senior Enthusiast

Jettech1

Posted
  • Author
Posted
1 minute ago, Flatus said:

I don't know. I am friends with the service manager at the dealer. I sat down with him in his office and he looked it up in the system to see if he could find any kind of bulletins describing the noise but he could not. I guess I'm just not going to worry about it for now. If it for some reason gets worse, than I will make plans to leave it with them so they can cold start it.

I'll figure this out and let you all know.  That's what I do.....lol...be well....

  • Like 1
CamGTP Senior Enthusiast

CamGTP

Posted
Posted

It's not the oil filter check valve, it's the oil pump itself. It bleeds back and gets air in the veins of the pump. The sound is the pump shoving that air through itself while is sucks up oil to send through the engine.

 

It does no harm to anything and these oil pumps have been doing it since 2014 when the LT engines came out. It's worse if you park on the incline and anything below like 40 degrees outside.

 

If you bought the truck in the summer, you'd never hear it.

  • Like 1
Flatus Enthusiast

Flatus

Posted
Posted
20 minutes ago, CamGTP said:

It's not the oil filter check valve, it's the oil pump itself. It bleeds back and gets air in the veins of the pump. The sound is the pump shoving that air through itself while is sucks up oil to send through the engine.

 

It does no harm to anything and these oil pumps have been doing it since 2014 when the LT engines came out. It's worse if you park on the incline and anything below like 40 degrees outside.

 

If you bought the truck in the summer, you'd never hear it.

It's almost always hot here. I hear it everyday. 

  • Like 1
Jettech1 Senior Enthusiast

Jettech1

Posted
  • Author
Posted
26 minutes ago, CamGTP said:

It's not the oil filter check valve, it's the oil pump itself. It bleeds back and gets air in the veins of the pump. The sound is the pump shoving that air through itself while is sucks up oil to send through the engine.

 

It does no harm to anything and these oil pumps have been doing it since 2014 when the LT engines came out. It's worse if you park on the incline and anything below like 40 degrees outside.

 

If you bought the truck in the summer, you'd never hear it.

I did buy it at the end of August which is hot as hell here in Atlanta.  But it immediately started making the noise when I had the oil changed early October.  It never made a peep until then....

Jettech1 Senior Enthusiast

Jettech1

Posted
  • Author
Posted
31 minutes ago, CamGTP said:

It's not the oil filter check valve, it's the oil pump itself. It bleeds back and gets air in the veins of the pump. The sound is the pump shoving that air through itself while is sucks up oil to send through the engine.

 

It does no harm to anything and these oil pumps have been doing it since 2014 when the LT engines came out. It's worse if you park on the incline and anything below like 40 degrees outside.

 

If you bought the truck in the summer, you'd never hear it.

So if that's the case, why did it not do it before I had the first oil change?  That's what has me scratching my head here...it's like, what the hell happened with just an oil change....

mjm-1957 Enthusiast

mjm-1957

Posted
Posted

Make sure that a PF63 filter is on there and that they used 5-30 oil and not 0-20. I work on the line at a GMC-Buick dealer and can tell you that the oil changes are usually done by the newest inexperienced ****** heads that they can find. Mistakes happen every day. I would not let half of them put air in a bicycle tire. Just something to check.

  • Like 1
It's Tim Senior Enthusiast

It's Tim

Posted
Posted
25 minutes ago, mjm-1957 said:

that they used 5-30 oil and not 0-20.

Pray tell how this can be accomplished, perhaps with the Bill Nye science set? 😉

newdude Senior Enthusiast

newdude

Posted
Posted (edited)
14 hours ago, Jettech1 said:

2022 2500 Chevy gasser......I know this topic has been discussed before, and I know GM said all is good. BUT, I never had that terrible sound until I had the oil changed at the dealer at 2500 miles.  Ever since then, every time I do a cold start I hear this, of what I think, is the timing chain just rattling like heck for a second.  I've checked the oil, it's fine, the dealer of course used a GM oil filter.  There has to be a way to fix this.  I hate it and want to get rid of it, the sound that is....I love the gas engine....best engine ever.  I just want it to not make a horrific noise on start up like it did before I had the oil changed for the first time.  Any ideas how to solve that?

 

 

Is the oil level good?  On your paperwork, is there a p/n of the oil used?  Did they install a PF-63 filter?  

 

Can you give us a video of a cold start?

 

Without hearing it I'm leaning towards normal.  Its the oil pump that is making the noise.

 

14-06-04-004H: Various Engine Noises During Cold Start and Warm Engine Operation - (May 12, 2022)

 

Oil Pump Cold Start Rrrrp or Rasp

The oil pump design has changed from a gerotor gear type pump to a two-stage vane type pump for fuel economy reasons. At temperatures at or below 0°C (32°F), or when the engine has been sitting for a few hours, it is possible to have air enter the pump through normal oil drain back. Upon startup, the owner may hear a short “Rrrrp” or “Rasp” coming from the front of the engine. It is most often heard during a remote start.

 

There is nothing wrong with the oil pump or oil system. No repairs should be attempted for this condition.

Edited by newdude
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