Jump to content

DFM disable?

Jmccracken1214
 Share

Recommended Posts

Hueless Enthusiast

Hueless

Posted
Posted

It's out there. Beta testers have units, I am one of these and have had a great experience with the device so far. I believe they intended on going to the production phase but covid has slowed things down.

 

Orlick82 New Member

Orlick82

Posted
Posted
1 hour ago, Hueless said:

It's out there. Beta testers have units, I am one of these and have had a great experience with the device so far. I believe they intended on going to the production phase but covid has slowed things down.

 

I’ve read that DFM is more elaborate than AFM. Is it true you have to change the internals of the motor if you’re going to delete DFM? Right now range only offers AFM which is a completely different system. Just wondering.

 

RST-stan Enthusiast

RST-stan

Posted
Posted

I don't get the hate for the DFM, I personally love being able to tool around at 21mpg and have the power there when I need it. I haven't put enough miles on it to really develop a hate for it

chadman Enthusiast

chadman

Posted
Posted

I've only got 2,000 miles on my 2020, and to this point, it has been seamless with no issues or detectable hesitations. I work in the business, and I know GM put in a lot of effort to correct the shortcomings of AFM.  Time will tell I suppose. 

175vTrailbossLT Enthusiast

175vTrailbossLT

Posted
Posted

What is the beef with DFM/AFM? I drive my truck and don’t notice anything. It doesn’t even tell you how many cylinders are working at any given time.

The ONLY reason I have heard that makes sense to me is it could be trouble long term.

There’s a plate with solenoids that are pressurized off of oil pressure. If the solenoids fail or there’s an issue with oil pressure, well there you go- a good way to burn off a cylinder or head..block..whatever. It’s just one more part in the system that can go wrong in a mechanical system. When this was explained to me, I can see why you’d want to disable it.

Now with regard to the aftermarket solutions to disable- is this controlled by software or is a physical mod required that voids warranty?

 

 

Sent from my iPhone using Tapatalk

Jmccracken1214 Enthusiast

Jmccracken1214

Posted
  • Author
Posted

I emailed range and they said the RA003 will work with AFM and DFM trucks! 
I’m guessing this will void the warranty, but is it possible to turn DFM back on if I needed dealer work and be ok? My truck only has 580 miles on it lol

Thomcat Senior Enthusiast

Thomcat

Posted
Posted
15 hours ago, 175vTrailbossLT said:

What is the beef with DFM/AFM? I drive my truck and don’t notice anything. It doesn’t even tell you how many cylinders are working at any given time.

The ONLY reason I have heard that makes sense to me is it could be trouble long term.

There’s a plate with solenoids that are pressurized off of oil pressure. If the solenoids fail or there’s an issue with oil pressure, well there you go- a good way to burn off a cylinder or head..block..whatever. It’s just one more part in the system that can go wrong in a mechanical system. When this was explained to me, I can see why you’d want to disable it.

Now with regard to the aftermarket solutions to disable- is this controlled by software or is a physical mod required that voids warranty?

 

 

Sent from my iPhone using Tapatalk

Early AFM systems developed oil burning problems caused by the discharge oil spray in the sump on nearby cylinders clogging the oil rings.In addition there were problems with the collapsible lifters of time oil problems at 60K+ and lifters at around 100K miles. Solenoids were never the problem, in fact the LOMA manifold with its own screen clogging problems, exclusive to AFM engines also uses them for the 4 AFM cylinders. Post 1/11 AFM production has addressed these problems with modified valve cover, modified PCV system, baffle over the AFM oil discharge valve, and a new gen of collapsible lifters less prone to damage caused dirty oil. Later volume increase of 5.3l sump capacity from 6 to 8 qts has also helped to extend oil life.

 

Here's my .02 opinion, take it for what it is worth. Had AFMs on my 3 Avalanches and '16 Silverado and by comparison the DFM system is totally seamless. I used the Range device in my '07 Avalanche because it had the early system with valve cover, lifter, PCV and AFM discharge problems. Never used it on the later ones nor will I use one on the '19 DFM because as far as I'm concerned there is no long term data on the new DFM system, talking years not accelerated studies, on use of a defeat device vs. use without one. Got to figure it has to be pulled periodically whenever car is taken for service, State inspections, grabbing codes for the EL, etc. Dealer spots it and no more electrical warranty.

 

The AFM and DFM engines are designed for operation on a varying number of cylinders and the solenoids along with the collapsible lifters are designed to flex thousand of times during each drive cycle. So I'd like to know what the effects would be of keeping the oil control solenoids idle or maybe worse open under constant voltage for an extended period....heat buildup?, varnish deposits inside tappets?....and what happens to collapsible lifters that remain in the one position for very long periods when the device is removed for inspection or service and they expand/collapse and jamb with accumulated varnish buildup in a static area? And what of variability of vehicle builds and that any particular gizmo will play friendly with each and every module programming in your particular vehicle as equipped ?.

 

I don't know and I don't think GM knows either since a DFM engine is barely 2 years old plus was not designed for usage in that manner......but I don't have to because system works just fine as is, plenty of pep and seamless operation.......and it makes no sense to fix something that isn't broken.

  • Like 4
Sierra50BMG Enthusiast

Sierra50BMG

Posted
Posted

Just installed a catback on my 2020 and don’t really notice at cruising speeds as far as the jake brake sound. I notice it around town more but interstate it’s miles ahead of the AFM system. 

175vTrailbossLT Enthusiast

175vTrailbossLT

Posted
Posted
Early AFM systems developed oil burning problems caused by the discharge oil spray in the sump on nearby cylinders clogging the oil rings.In addition there were problems with the collapsible lifters of time oil problems at 60K+ and lifters at around 100K miles. Solenoids were never the problem, in fact the LOMA manifold with its own screen clogging problems, exclusive to AFM engines also uses them for the 4 AFM cylinders. Post 1/11 AFM production has addressed these problems with modified valve cover, modified PCV system, baffle over the AFM oil discharge valve, and a new gen of collapsible lifters less prone to damage caused dirty oil. Later volume increase of 5.3l sump capacity from 6 to 8 qts has also helped to extend oil life.
 
Here's my .02 opinion, take it for what it is worth. Had AFMs on my 3 Avalanches and '16 Silverado and by comparison the DFM system is totally seamless. I used the Range device in my '07 Avalanche because it had the early system with valve cover, lifter, PCV and AFM discharge problems. Never used it on the later ones nor will I use one on the '19 DFM because as far as I'm concerned there is no long term data on the new DFM system, talking years not accelerated studies, on use of a defeat device vs. use without one. Got to figure it has to be pulled periodically whenever car is taken for service, State inspections, grabbing codes for the EL, etc. Dealer spots it and no more electrical warranty.
 
The AFM and DFM engines are designed for operation on a varying number of cylinders and the solenoids along with the collapsible lifters are designed to flex thousand of times during each drive cycle. So I'd like to know what the effects would be of keeping the oil control solenoids idle or maybe worse open under constant voltage for an extended period....heat buildup?, varnish deposits inside tappets?....and what happens to collapsible lifters that remain in the one position for very long periods when the device is removed for inspection or service and they expand/collapse and jamb with accumulated varnish buildup in a static area? And what of variability of vehicle builds and that any particular gizmo will play friendly with each and every module programming in your particular vehicle as equipped ?.
 
I don't know and I don't think GM knows either since a DFM engine is barely 2 years old plus was not designed for usage in that manner......but I don't have to because system works just fine as is, plenty of pep and seamless operation.......and it makes no sense to fix something that isn't broken.

Great response thanks!


Sent from my iPhone using Tapatalk
  • 1 year later...
G.Cramer New Member

G.Cramer

Posted
Posted

Chevrolet did void our warranty because a previous owner had used the Range AFM/DFM disabler even though it is no longer on the truck they could tell. The void not only covers the drivetrain but ANYTHING on the vehicle including new parts and new work meaning if we pay them to fix a windshield wiper motor and it breaks again before we get off the lot they will NOT honor its warranty. However this is totally NOT legal and we will do our best to get this reversed but so far our warranty is VOID!! Just so you know!!

lapoolboy Senior Enthusiast

lapoolboy

Posted
Posted
10 minutes ago, G.Cramer said:

Chevrolet did void our warranty because a previous owner had used the Range AFM/DFM disabler even though it is no longer on the truck they could tell. The void not only covers the drivetrain but ANYTHING on the vehicle including new parts and new work meaning if we pay them to fix a windshield wiper motor and it breaks again before we get off the lot they will NOT honor its warranty. However this is totally NOT legal and we will do our best to get this reversed but so far our warranty is VOID!! Just so you know!!

BS.  They are inviting a lawsuit.

  • Like 2
  • Thanks 1
  • 5 months later...
ManicFury New Member

ManicFury

Posted
Posted (edited)
On 5/16/2021 at 1:14 PM, G.Cramer said:

Chevrolet did void our warranty because a previous owner had used the Range AFM/DFM disabler even though it is no longer on the truck they could tell. The void not only covers the drivetrain but ANYTHING on the vehicle including new parts and new work meaning if we pay them to fix a windshield wiper motor and it breaks again before we get off the lot they will NOT honor its warranty. However this is totally NOT legal and we will do our best to get this reversed but so far our warranty is VOID!! Just so you know!!

 

According to the Magnuson-Moss Warranty Act of 1975, a manufacturer can only deny warranty coverage if it can demonstrate that a non-original equipment part or related service caused a defect to occur to the original product.

 

Read the following link provided. A manufacturer can NOT "void" a warranty for any reason. The can only attempt to deny a warranty claim, but they bear the burden of proof.

 

As lapoolboy stated: they are inviting a lawsuit.

 

https://www.autoanything.com/resources/magnuson-moss-warranty-act-explained/

Edited by ManicFury
  • Like 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

  • Latest Articles

  • Posts

    • Chuck FB
      OCI, not when but why?

      By Chuck FB · Posted

      The not as clean as one would assume theme with the new engine oil, that reminds me of comments over the years with mechanics not always being so on board with filling an oil filter, not from the center anyway due to that typically being the clean side of the filter, danger of some contaminant falling into the filter if not careful but the realization now that the oil may not be as pure as one had assumed it would surely be. Yes it would be possible to fill from the small holes but that means messing with something to prop open the anti drain back valve if the filter is so equipped and not damage that valve in the process. Me, I have hardly ever prefilled an engine oil filter however I have prefilled diesel fuel filters with a filter on a fuel bulk tank and for anyone that has messed with diesel engines with filters and units that have a limited or no way of priming them, putting on a dry filter is a bad day to say the least with those crappy systems. But anyway back to not so clean engine oil, indeed perhaps its not so bad after all that I have not made a practice of prefilling oil filters.    As Grumpy Bear commented on keeping things clean, that I really have to wonder what the typical practice is at a dealer or any other shop that changes engine oil, do they make sure to wipe or wash off the oil plug and certainly if it fell into some gunk or onto a dirty floor, or that they wiped the filter mounting flange and didn't go and use some dirty rag and end up adding dirt to the inside of the head of the filter mount. Or be careless in how they stored or handled the new filter and if they were bumping into items under the vehicle with the filter opening facing up and having dirt drop right into the filter and if so right into the threaded center that is on the clean side. The top side, did they clean away the built up gunk that may be around the filler before removing the cap or to be really careful at that point that something right close to the filler hole that was hidden under the caps flange won't fall into the engine. Or did they clean the funnel or was that just laying there covered in oil from the oil change before and dust kicked up from sweeping the floor stuck to the oil and now that will go running into the next persons engine due to just not cleaning the funnel as "they won't know anyway" attitude as that young guy is more worried about taking a break so he can go outside and smoke a joint. Just random points that came to mind when I think about what some hired personnel may do that the shop foreman has no idea of or perhaps the whole attitude of some shops may be "eh ... who cares, they will never know the difference anyway".  
    • CamGTP
      Gas Prices

      By CamGTP · Posted

      $3.69 for 87 octane.   $4.24 for Diesel in town.
    • Atlas
      OCI, not when but why?

      By Atlas · Posted

      On the subject of OLM, Gm's OLM tool may be more "informed" than others brands. I recall OLM's in mid-2000's Chrysler products literally counting down a set number of miles. That's all the OLM appeared to be.    I would actually expect GM to be able to explain the parameters that their OLM takes into account from a high level. No, I would not expect them to disclose their software coding or data analysis around their parameters.   So we're talking about two different topics, so to continue the subject on the other one, I'd be curious to know how much "standard particulate matter" in fresh oil is able to be filtered at first start by a fresh oil filter. How much particulate matter is enough to "matter"?   I.e. how much of a "lever" do we think this equates to (variability in particulate content, in fresh oils, between different makes/brands, some which filter less, and some that filter more).   We can say that more particles = more wear = shorter engine life as a logical statement and use that data with a little marketing to scare people into selecting a more refined/filtered oil. Using a similie, is this like deciding to forego two alcoholic drinks in a lifetime because we're worried about the potential impact on lifespan? Are there numbers which translate the ISO test results into a quantifiable increase in wear for a given engine/use case?
    • chris21
      Brand new to this forum. Questions about re-gearing my 26’ HD

      By chris21 · Posted

      I'm pretty sure it doesn't actually recalibrate the speedometer it just changes the wheel speed sensor inputs to the computer. The truck still thinks it has stock tires.
    • asilverblazer
      OCI, not when but why?

      By asilverblazer · Posted

      I apologize, I missed this post, at risk of going off CURRENT TOPIC.   I'm not saying it is BS, I'm questioning how much information is being held back. GM is NOT going to spell out exactly every parameter in the algorithm. Liability, intellectual property, etc.    I'm not naive enough to believe that it is as simple as revolutions, coolant temperature, miles, time; are you?    I don't do irrational either, and boiling the OLM down to four simple values that I could code in an afternoon (I'm not a coder) is irrational - unless it suits your agenda to ignore it. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...