Jump to content

Any lifter failures in 5.3 without DFM

Nutmeg
 Share

Recommended Posts

Nutmeg Enthusiast

Nutmeg

Posted
Posted

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.

  • Replies 48
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

newdude
newdude

We've sold a bunch, zero in the field factory DFM disabled failures that I can report.  SupremePizza said "yes" on the first page, I replied to him to give any recent examples, never responded.  

haider320
haider320

Build date 10/21 and no DFM.  I only have 1100 miles on the truck though.  So far so good.  Fingers crossed...   

newdude
newdude

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

Posted Images

milkmaster Enthusiast

milkmaster

Posted
Posted (edited)

Not so far!  Only 5k miles though.  Built in June 21

Edited by milkmaster
Supreme Pizza Senior Enthusiast

Supreme Pizza

Posted
Posted
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.

 

 

Flatblack83 Enthusiast

Flatblack83

Posted
Posted

There have been quite a few, its hit and miss. They did a poll on face book, it seemed like 10% have had problems with lifter failure and an occasional  bent pushrod. The mileage goes all over too, from 50 miles to 120k..lol

Nutmeg Enthusiast

Nutmeg

Posted
  • Author
Posted
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.

 

haider320 Enthusiast

haider320

Posted
Posted

Build date 10/21 and no DFM.  I only have 1100 miles on the truck though.  So far so good.  Fingers crossed...   

  • Like 1
Byrds8 Enthusiast

Byrds8

Posted
Posted

Build date 7.21, no DFM and 2500 miles. So far so good. Hope like hell it doesnt break. Sad this is something that has to be a concern.

newdude Senior Enthusiast

newdude

Posted
Posted (edited)
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
Nutmeg Enthusiast

Nutmeg

Posted
  • Author
Posted

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
lebag335 Enthusiast

lebag335

Posted
Posted
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

Steve-2019 Enthusiast

Steve-2019

Posted
Posted
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

Stifler Enthusiast

Stifler

Posted
Posted

OK I will be the dummy... there are 21s with no DFM? or are you talking disabled with a tuner? How do you know if you have or dont have DFM?

WeGone Enthusiast

WeGone

Posted
Posted (edited)

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

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

  • Latest Articles

  • Posts

    • bwiese
      upgrading speakers on 2026 std cab WT...

      By bwiese · Posted

      I don't wanna do major surgery/upgrades, behind-the-dash work, add amps, change radio etc. on my '26 std cab WT. On the WT, it has the base 7" IOR infotainment setup, and only two speakers (doors). Since I listen to classical, looked around for speakers that do well and dug thru reviews. Two-way speakers were found to be better than 3-way. So I've ordered a pair of  Infinity Reference REF-9632IX 2 way speakers.  [These may  or may not have been discontinued / succeeded by the 3-way ...9633 ones.]    These speakers are lauded for 3 ohm and 94db sensitivity spec so they'll work well for ordinary base car radios without amps and offer better performance (quality,  strength) than  default base paper-cone speakers. They'll be installed in a few days and I'll let y'all know what I think. Bill W San Jose      
    • RyanbabZ71
      RyanbabZ71's 2019 High Country

      By RyanbabZ71 · Posted

      Thanks!   Changed out the rear shocks today to Bilstein 5100s.  So far feel much better. The stock Rancho were wore out.  Lots of heavy hauling (2 moves, home renovations, etc).  Next up is new BFG tires Monday.  Cant wait the current tires have little to no wet traction and are super loud (hum)    
    • Snowcamo
      No high speed fans...

      By Snowcamo · Posted

      Ok, I got the all the codes. What do you all think would be a place to start?
    • Chuck FB
      Correct way to service 2024 l8t allison trans?

      By Chuck FB · Posted

      How about I just point to the factory pans stand pipe little drain plug and claim its a pan with a real drain plug !. I just couldn't swallow the fact that a Dorman pan which at this point is probably the only pan out there that fits the gas version truck cost that much up here in Canada so I decided initially anyway to skip it and see what I thought of pulling the pan method and down the road if I felt inclined enough then I would either install a drain plug kit in the factory pan if there is enough room for it, or have a bung welded onto it, or put an aftermarket pan on. The thing is if the pan is not pulled then the magnets in the pan can't be inspected and cleaned or if wanting to change out the filter. However of course it certainly would make the job easier to be able to drop the oil first before having to handle the pan if dropping the pan that go around was the goal.    I knew a guy locally that was doing custom field spraying years ago with a pickup pulling a ground driven sprayer, I believe it was a GM pickup with an automatic trans. He had a drain plug in his pan and would drop the oil out of it once a week and top it back up through the dipstick tube to keep refreshing a portion of the oil often and that made the transmission last far longer than had he done nothing. Soft fields pulling 500 gallons of water at the start of each mixed up sprayer tank batch and in low range sucking along. I imagine he got some tips from other custom sprayer outfits doing the same thing at the time and learning from their blown up tranny mistakes. Transmissions then had no lock up converter so would cook the crap out of the fluid slipping that much and it would not have been synthetic fluid either. 
    • KARNUT
      Gas Prices

      By KARNUT · Posted

      3.39 Kroger’s in Montgomery Texas. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...