Understanding Active & Dynamic Fuel Management and The Problems They Cause (AFM vs DFM)

[@leoalpha7]

This is a good video. When I looked up AFM, almost every video just talks about disabling it.

[@8020Media]

Thanks for watching! It's a rather technical system when you get into the details of it but always important to know at a high level how it works and why it should be disabled!

[@allcore5172]

I use boost in my 15 Denali, absolutely great product that is cheaper than range. Thanks

[@8020Media]

A - Thanks for the support! We really appreciate it.

[@ammarsulaiman8353]

Just bought one For my 2022 Chevy with 8 speed transmission, I will check it and let you know about it

[@8020Media]

A - Thanks for the support! Keep us posted!

[@DustinKeating-yk3vq]

I have a 07 Silverado that has the full delete normal lifters changed cam shaft valley cover and my truck runs like a dream

[@8020Media]

D - The right way to do it, we just can't recommend it publicly!

[@truenorthcanadian5628]

My brother-in-law has a 17 Sierra, cousin has an 18 Sierra and my dad has a 15 Silverado. Hardly any engine problems with the 3 of em combined.

[@8020Media]

T - Nice! Do they have any upgrades?

[@truenorthcanadian5628]

@@8020Media No, my dad's is a company truck. Only upgrade that was done was my cousin's tires. He's got bigger tires on his.

[@8020Media]

T - They must take great care of them! Thanks for sharing these.

[@rofin9541]

Great Video.

[@8020Media]

Thanks! Glad you found it helpful

[@austinsmith8010]

do the GMC sierras 2022 year model refresh and up have this still?

[@8020Media]

A - Unfortunately, yes.

[@lassiter42]

2021 GMC Sierra 6.2 Lifter failure at 22,000 miles.

[@8020Media]

G - So sorry to hear this.. Very sad what these "emissions" systems are doing to new vehicles.

[@George-on3zm]

Really??? I just bought a 21 GMC AT4. 6.2. With 59k miles. So far so good.

[@lassiter42]

@@George-on3zm Keep up on Oil changes. I have heard that this helps the cause.

[@8020Media]

G - Absolutely.

[@deere3321]

The 3.6, V6 AFM is a double overhead cam engine and the afm is done in the rocker arms. They have been trouble free.

[@8020Media]

Yepp definitely less problematic than the others!

[@rockymking]

When will the Boost AFM/DFM Disabler be available for 23-24 Sierra 1500 models?

[@8020Media]

R - We are working on it, but don't have any updates on this as of yet.

[@mikeorton190]

At what mileage do people start having issues with the management system if most mileage is driven under 50 mph and synthetic oil used at 5000 mile change cycle?

[@8020Media]

M - Unfortunately, there isn't a specific mileage range it typically happens. However, the more miles that is put on, the higher the likelihood. All you can really do is take great care of the engine, which it sounds like you're doing!

[@COMPASBASSCHICALI]

I HAVE EXCESSIVE OIL CONSUMPTION IN MY 2009 CHEVROLET TAHOE LS MODEL. 1/2 - 1 QUARTER DURING ANY TRIP OF 100-200 MILES. IT HAS 140K MILES, BUT ENGINE IS IN GOOD CONDITION OTHER THAN OIL CONSUMPTION AND WEAK ACCELERATION WHICH I THINK IS DUE TO THE AFM SYSTEM. DO YOU KNOW IF THE AFM SYSTEM CAN BE THE CAUSE OF THESE PROBLEMS? AND WILL YOU PRODUCT HELP ME STOP THE PROBLEMS? THANK YOU.

[@8020Media]

C - It is possible that AFM could be causing some excessive oil consumption. However, it likely isn't your sole cause here. Are you having any other drivability issues?

[@rickmonster636]

Does the 2024 Silverado 5.3 V8 still have AFM ?

[@8020Media]

R - It has DFM.

[@rickmonster636]

@@8020Media thanks for the info

[@flyer8493]

Never heard of this product till now. I just got a $50 Amazon one, probably Chinese but it works. I noticed the one I have does not start disabling DFM (19 Silverado) until I hit 40 mph, so after I pull out of my neighborhood. After I hit 40 mph it’s good to go at any speed. Does this one operate in a similar fashion or is DFM disabled immediately without having to hit a certain speed first?

[@8020Media]

F - Ours works immediately and it's made in the US.

[@x7amdan_R34]

When this system activates ? Or how to know if it's active ? I own a 2022 sierra elevation 5.3l v8

[@8020Media]

X - Typically you'll see a "V4" on the dash when you're driving on the highway.

[@artikasprayfoaminsulation7107]

How do we order this ? Have a 2018 lfiters failed and replaced and dont want it to happen again.

[@8020Media]

A - So sorry to hear! We have a link in the description, but here it is for ease: www.amazon.com/dp/B0D1T1FMJK?maas=maas_adg_2CDE464277A6404D470A623F0084F062_afap_abs&ref_=aa_maas&tag=maas

[@skunkedfishing7868]

What would have been simpler would have been if they just let the lifters work normally while shutting off fuel delivery to different cylinders as necessary. I imagine that with the valves closed while the piston is trying to induct and expel it builds pressure and forces the currently working cylinders to work harder to rotate the crankshaft thus defeating any fuel economy gain.

[@8020Media]

S - Well said. Thanks for sharing this insight.

[@Stopvotingdemocrat]

@@8020Mediado u think i need this product on my 2021 2.7 turbo silverado??

[@Heatherder]

Now you are just pumping air through the engine without using it i.e. engine braking. That would actually defeat the purpose. With the valves closed, the air in the cylinder acts as an air spring, recovering some of the compression losses.

[@8020Media]

S - Unfortunately, our product won't work on your vehicle.

[@tristanwwsd]

@@Heatherder Or metering just enough fuel to neutralize the compression.

[@karlaatherton]

My husband and I just traded in both of our Suburbans last weekend. They both have the 5.3L engines. His was a 2016 with 115k miles, and mine a 2018 with 86k miles. None of them had the engine failure. We were very proactive to replace the oil every 3k miles with Mobile One Full Synthetic oil. The 2016 tranny failed a little over 50k miles, we replaced it with a new Chevy tranny at our expense.

[@8020Media]

K - Thanks for taking the time to share your experience! Crazy what happens when vehicles are well maintained.

[@buckshot4428]

I bought a new 14 v-6 Silverado not knowing about the afm. I felt it kick in and knew it was not good for the engine. I only had to add a small amount of pedal to get it back to firing on all 6. I bought a afm delete that now prevents the afm from kicking in. It plugs into the port under the dash with no modifications. It does have a constant drain on the battery so for l/t storage just remove it. Well worth the $$$.

[@8020Media]

Yepp, that's the best way to do it. If you want a device with less drain, our Boost device only pulls 0.71mA of power while turned off. Range's device pulls up to 6mA and usually sits within 2-3mA so theirs drains battery way faster than ours does.

[@buckshot4428]

@@8020Media I will vouge for that.

[@8020Media]

B - Yep... That's why we took the time to make a competing device that's cheaper and addresses their faults!

[@joey011582]

Had a 2021 suburban fail at 8k

[@8020Media]

J - Wow.. So sorry to hear this. Lifter failure?

[@joey011582]

Yep, took out the cam, and bent valves and push rods ​@8020Media

[@8020Media]

J - That's crazy... They definitely don't make them like they used to.

[@George-on3zm]

Have a 21 GMC. With 6.2. So far so good.

[@8020Media]

G - Nice. How many miles do you have on it?

[@George-on3zm]

@@8020Media 60k

[@cobrastrikesagain6385]

How many miles u have on it

[@8020Media]

G - Thanks for sharing your experience.

[@donaldhollingsworth3875]

The camshaft also needs to be replaced anytime the AFM or DFM lifters. Also, GM has a newer DOD - Displacement On Demand - on newer cars & trucks which has several hundred or more ways to deactivate cylinders.

[@8020Media]

D - Think "several hundred or more ways" might be a stretch. Depending on what years you are referring to, there aren't very many solutions of deactivating these systems, unless you delete them.

[@donaldhollingsworth3875]

@@8020Media Thank you for your comment. Don't get me wrong, I love GM trucks but having a AFM, DOD or a DFM system on a truck to save 1-2 miles per gallon is just stupid on GM's part. Also, having a GDI system is stupid since Ford & other OEM's ran into a lot of problems with their GDI systems because excess carbon builds up on the intake valves. GM is probably going to have the same issues. Another stupid idea is the auto stop/start system because most engine wear occurs at start up since their is no oil pressure for a few seconds which over time will wear out the piston rings & increase cylinder wear. First came the Active Fuel Management (AFM) which deactivated the same 4 cylinders which created hot & cold cylinders when in V4 mode. Then came the Displacement On Demand (DOD) which came on certain GM models. I can't remember how that system worked. Then the modern Dynamic Fuel Management (DFM) which GM states there are 17 different ways to deactivate certain cylinders from a V8 mode to a V4 mode to a V2 mode. On the AFM & DOD systems there are a lot of lifter, camshaft, & piston ring failures at low mileage. Statically speaking there are thousands of different combinations. Think of it as all the different number combinations while playing to lottery. The 2 major problems to over come is heat retention of the deactivated cylinders & engine balance. If there was a way to restrict coolant flow around the deactivated cylinders & have a electronically controlled harmonic balancer so a odd number of cylinders could be deactivated would provide even more combinations of deactivating cylinders.

[@8020Media]

D - We don't disagree. Thanks for taking the time to share these insights!

[@GregIX]

I see the boost isnt shown as compatable for the 2023 / 24 Silverado 1500... Does it work for them also?

[@8020Media]

It does not currently work on 2022 refresh, 2023, or 2024 Silverado or Sierra's. We're working on one but aren't sure when it'll be ready yet!

[@GregIX]

@@8020Media Thanks! From your experience are there many issues with the 2022 refresh 2023 models? 6.2l. Cheers

[@8020Media]

G - It's honestly too early to tell.

[@Logan-de3xx]

You don’t make these for 2023-2024 Models with the 6.2?

[@8020Media]

L - Not currently, but this is something we are seriously looking into.

[@lickwidapex222]

Look faster. 2023 5.3L here. Id like my V8 fulltime please.

[@8020Media]

L - lol, we wish it was that easy. But will keep you updated.

[@George-on3zm]

@@8020Mediai just got a 21 GMC AT4. 6.2. 59k miles. So far so good. Wonder if i should pusrchase this ?

[@rockymking]

Another '24 5.3 owner waiting for release of a compatible delete module.

[@southernslowdahns9235]

Will this work for a cadillac escalade?

[@8020Media]

S - What year?

[@megadethguym7977]

Will the little afm devices work in 2006 gmc sierra 4.8?

[@8020Media]

M - Unfortunately, our device isn't compatible with your 06 Sierra.

[@flyer8493]

You don’t have AFM in a 2006 Sierra. That started in 2007. Yours always runs all 8 cylinders.

[@Stopvotingdemocrat]

does this work on my 2021 silverado 2.7 turbo

[@8020Media]

S - Unfortunately, no.