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2014+ AFM (Active Fuel Management)

Ron.s

By Ron.s
in Engines & Drivetrain

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wmgeorge64 Enthusiast

wmgeorge64

Posted
Posted (edited)

Is there another one on the market other than the Range? Is there a way to switch from AFM delete to normal mode while driving, other than stopping the truck and pulling it out when its not running?

Never mind I had one ordered.

 

Edited by wmgeorge64
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oldmann
oldmann

Why are people so concerned about this topic. I do not understand it. Just drive it. End of story. And yes, even if you can't figure out why the truck has it, it is to save fuel.

pm26
pm26

No, it does not. Not even close. The only Cadillacs that possibly exceeded the weight of 2014 GM crew cab 1500 4x4 pickups were the old land yachts (1976 and older) models. I believe that a 1976 Ca

seamonster
seamonster

Whats up with the name calling?   Cant you see we agree----the AFM feels like a gear shift!   Many people want 6 and 8 speed tranny and then complain they can feel AFM. That is what I dont unders

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wmgeorge64 Enthusiast

wmgeorge64

Posted
Posted

Got my Range AFM module in and test drove this morning.  Did not do the Shudder test at the spot it happened….. But it shifts like a dream.  The Crappy 1-2  2-1 shift is gone.  It was like driving my old 2006 again. Thanks Guys and Gals for the help!! 

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doropallo Enthusiast

doropallo

Posted
Posted

Just got my latest OnStar diagnostic report and I guess I need to unplug the Range at that time of the month.

 

Screenshot_20191114-071212_Gmail.jpg

Bob2C Enthusiast

Bob2C

Posted
Posted
Just got my latest OnStar diagnostic report and I guess I need to unplug the Range at that time of the month.
 
Screenshot_20191114-071212_Gmail.thumb.jpg.ec581bbbc332466598e1742fab8dde53.jpg


I just disabled the monthly reports. If there is a problem I will get a light on dash.


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  • 1 month later...
papageoff Enthusiast

papageoff

Posted
Posted

I recently had 2 cylinder's AFM system replaced.  I've noticed in the couple months since that my mileage seems to have gone down a bit.  It seems to go in to 4cyl mode just as often as before, but when it does many times the MPG gauge doesn't move.  Other times it bounces back and forth between 18 and 24 like a clock ticking.  It didn't used to behave like this.  I'm driving the same roads. 

 

Also, (and I believe unrelated) I had the cat coverter y-pipe replaced under warranty a couple weeks ago.  At least one core was rattling.  I first noticed it after the AFM repair, but it might have been doing it before... I'm not sure.

 

I'm just curious is anyone else noticed anything like that when there's was fixed.  

  • 4 weeks later...
ScottyMac223 Enthusiast

ScottyMac223

Posted
Posted

Hey All!  New to the forum.  I wanted to thank everyone for the valuable info in this thread.  I started operating my truck in L5  yesterday to avoid the V8-V4-V8 AFM b.s. and am very happy with the performance of the truck being run that way.  Thanks a bunch!  

 

  • 2 weeks later...
Prospect62 Enthusiast

Prospect62

Posted
Posted

Yeah I spent about 6 hours on this site and immediately ordered a Range AFM disabler for my 2016 Suburban. Thank goodness for places like this.

Bobstoy 53 Enthusiast

Bobstoy 53

Posted
Posted

Hello, new to this forum. Recently purchase a 2016 GMC  35K with the 5.3 engine. Just to give a different point of view from the posts i am reading. My truck shifts so smooth you cant feel unless you are watching the tach. It also changes in and out of 4 cyl mode where you cant feel it. I just took a 100 mile trip and averaged 20 MPG in 15 degree temps. So i am happy with my AFM.

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  • 2 weeks later...
doropallo Enthusiast

doropallo

Posted
Posted

My 2016 GMC Sierra SLT hit 49K this weekend and I took it in and had the transmission fluid and filter changed and it shifts so smoothly that I haven't put the Range back into the OBD. 8 speed btw.

  • 3 weeks later...
Hugeroost Enthusiast

Hugeroost

Posted
Posted

So ole Roost checking in here, had a 12 Tahoe that was destroyed by AFM and now have a 14 Silver w a 5.3. I see the range plug in looks like still the way to go ?? I'm not letting that AFM bullshyt mess up this one. I started reading first page till i saw how old it was so skipped to the back, what did i miss, same ole BS i reckin. One thing i noticed while reading this thread, is all the mpg talk, my opinion is F that, you dont buy a full size 4x4 truck w a v8 for gas mileage. You want great mpg get a 6 cyl truck w no balls, you cant have it all your gonna give up something somewhere, you guys over 40 should no this, aint nothin free. So it seems the 14's and newer drop to 4 cyl instead of 6, i think that Tahoe dropped to 6 ? Why IN THE HELL would anybody want a big truck that ran in 4 banger mode, and whats the other 4 doing at that time, smokin a ciggerette, thats bullshyt, and will cause problems sooner or later. Ford comin w a 7 plus litre motor and we're cryin about gas milage and pushing dropping to 4 for milage. There is no gas shortage i repeat there is no gas shortage, who TF cares if it gets 16-18-20 there's plenty of it for sale, i want max hp at all times, dropping down to 4 is gay as hell, give me a big block in a half ton truck, 10mpg, now then. What is wrong with you guys

BMyers Enthusiast

BMyers

Posted
Posted

I bought the Diablo tuner, ran the diablo tune, turned off AFM, turned off DOD, added 20% throttle response.   Runs great, better mileage by 2-3 mpg, sometimes more and it runs great all the time without the cylinder deactivation sounding bad and herky jerky stuff.   Shifts better too btw and left torque management on, tried it off but its better on.

Bob2C Enthusiast

Bob2C

Posted
Posted
12 minutes ago, BMyers said:

I bought the Diablo tuner, ran the diablo tune, turned off AFM, turned off DOD, added 20% throttle response.   Runs great, better mileage by 2-3 mpg, sometimes more and it runs great all the time without the cylinder deactivation sounding bad and herky jerky stuff.   Shifts better too btw and left torque management on, tried it off but its better on.

Do you notice any ping when under light load? I installed the 87/89 tune was getting that. I returned to stock and just adjusted the idle up a bit and turned off AFM. I have no ping on stock tune. Curious as to what tune your running and grade/type of gas. 

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
5 hours ago, Bob2C said:

Do you notice any ping when under light load? I installed the 87/89 tune was getting that. I returned to stock and just adjusted the idle up a bit and turned off AFM. I have no ping on stock tune. Curious as to what tune your running and grade/type of gas. 

Bob, read that post carefully. 1.) First post 2.) He turned off both AFM and DOD. Really? C'mon man. They are the same thing 3.) He's using he DIC to report some fiction on mileage. It's physically impossible.  4.) Herky Jerky? LOL....not. 5.) Sounding bad. I know I'm half deaf but if the factory exhaust is in play you are hard pressed to hear it under any conditions. 6.) IF and it's a big if, you could HEAR ping then your knock sensors are not working as they should. 

 

Internet is full of this crap. It's a full story below you brother. 

Bob2C Enthusiast

Bob2C

Posted
Posted
Bob, read that post carefully. 1.) First post 2.) He turned off both AFM and DOD. Really? C'mon man. They are the same thing 3.) He's using he DIC to report some fiction on mileage. It's physically impossible.  4.) Herky Jerky? LOL....not. 5.) Sounding bad. I know I'm half deaf but if the factory exhaust is in play you are hard pressed to hear it under any conditions. 6.) IF and it's a big if, you could HEAR ping then your knock sensors are not working as they should. 
 
Internet is full of this crap. It's a full story below you brother. 

Good point. Multitasking as I get older gets harder. Lol. As far as ping I def heard it on mine cruising about 40 to 50 when pressing accelerator slightly going up a hill Tune installed. Same stretch of road stock tune it’s not there. So for me it wasn’t worth it to keep the tune since it wasn’t my objective in the first place. Stock is fine with me.


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