Jump to content

Any lifter failures in 5.3 without DFM


Recommended Posts

Was interested if any of the trucks shipped without DFM have had any lifter failures? Understand they have all the same mechanical parts so am concerned as I have a 2021 Sierra with a May build date. Outside the known date but since the hours were high compared to the miles thinking it may have been one that was idle tested.

Link to comment
Share on other sites

12 hours ago, Nutmeg said:

Was interested if any of the trucks shipped without DFM have had any lifter failures? Understand they have all the same mechanical parts so am concerned as I have a 2021 Sierra with a May build date. Outside the known date but since the hours were high compared to the miles thinking it may have been one that was idle tested.

 

 

Yes.

 

 

Link to comment
Share on other sites

13 hours ago, Supreme Pizza said:

 

 

Yes.

 

 

Well that kills a couple of the theories. Do you know if they are using the standard DFM lifters as replacement or a different design since the DFM is not active.

 

Link to comment
Share on other sites

On 12/31/2021 at 1:07 PM, Nutmeg said:

Was interested if any of the trucks shipped without DFM have had any lifter failures? Understand they have all the same mechanical parts so am concerned as I have a 2021 Sierra with a May build date. Outside the known date but since the hours were high compared to the miles thinking it may have been one that was idle tested.

 

 

Have yet to see any with failure.  

 

 

On 1/1/2022 at 1:29 AM, Supreme Pizza said:

 

 

Yes.

 

 

 

 

Got any examples of lifter failure of a factory DFM disabled truck?  We've sold a bunch, some over 10K on them, no failures.  

 

 

On 1/1/2022 at 2:58 PM, Nutmeg said:

Well that kills a couple of the theories. Do you know if they are using the standard DFM lifters as replacement or a different design since the DFM is not active.

 

 

No.  Same mechanicals.  ECM is missing the parts to operate DFM.  

Edited by newdude
  • Like 1
Link to comment
Share on other sites

Good to hear some positive news. Have 2k on mine and want to see a whole lot more. Have a oil pressure question. My 5.3 no DFM from factory, has 90 lbs oil pressure on a cold start, normally runs down the road just below 60, and drops to 30 or a hair under at idle. Is this what others have seen on theirs? 

  • Like 1
Link to comment
Share on other sites

9 hours ago, Nutmeg said:

Good to hear some positive news. Have 2k on mine and want to see a whole lot more. Have a oil pressure question. My 5.3 no DFM from factory, has 90 lbs oil pressure on a cold start, normally runs down the road just below 60, and drops to 30 or a hair under at idle. Is this what others have seen on theirs? 

Yes

Link to comment
Share on other sites

13 hours ago, Nutmeg said:

Good to hear some positive news. Have 2k on mine and want to see a whole lot more. Have a oil pressure question. My 5.3 no DFM from factory, has 90 lbs oil pressure on a cold start, normally runs down the road just below 60, and drops to 30 or a hair under at idle. Is this what others have seen on theirs? 

 

Normal

Link to comment
Share on other sites

You can check the RPO codes, I also read its on the window sticker as a $50 credit.  Check some of the older posts about it they list what to look for.

 

Try this for starters.

 

 

Edited by WeGone
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Forum Statistics

    245.8k
    Total Topics
    2.6m
    Total Posts
  • Member Statistics

    333,234
    Total Members
    8,960
    Most Online
    Donald Dolan
    Newest Member
    Donald Dolan
    Joined
  • Who's Online   3 Members, 0 Anonymous, 935 Guests (See full list)




×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.