Jump to content

2014+ AFM (Active Fuel Management)

Ron.s

By Ron.s
in Engines & Drivetrain

 Share

Recommended Posts

Joe_K Enthusiast

Joe_K

Posted
Posted

 

Same here by last vehicle had MDS (Hemi) and I did not notice it switching either but it did not have any lights or anything to indicate that it was switching between the two separate displacements.

 

Strange, I could definitely tell when the MDS kicked in on my Hemi. Then I cut the factory muffler off and put a 14" Magnaflow on it, after that the MDS drone was horrible so I turned it off with a tuner.

 

fea87f68-6b8a-4798-b6a7-6b8361706115_zps29e272ae.jpg

  • Replies 555
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

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

Posted Images

voltedge Enthusiast

voltedge

Posted
Posted

Same deal here. My old Ram Hemi felt like a harsh downshift and the obvious rpm engine sound change. This truck does it as well. but it's so smooth that you only notice it if you are in an area where it does it back and forth from 4 to 8 a couple times due to whoop de do hills on the road. The transmission shifts so much smoother than my old Ram, that I believe it takes care of most of this. I will say that I feel like it is a little harsher now than when it had less than say 1,000 miles on it.

KUUG Enthusiast

KUUG

Posted
Posted

Mr Kugg

From the look of your truck with lift and tires not getting V4 very often is not a problem, it should be expected.

 

Of course its a problem! There only 33's. The better gas mileage I can get the more my wallet likes me.

 

I do realize that bigger tires+lift = bad mpg but I didn't go that big. It's expected but I took a pretty drastic hit on highway mpg. Either way I like the truck how it is now so nothing is going to change.

dkeven Enthusiast

dkeven

Posted
Posted

mine switches out fairly seamlessly now with 7800 miles on it, lower
speeds seem to make it more noticable. Can't give it to much gas without
it going back to V8 mode do it stays in V8 most of the time. Mileage is
a little better than my other trucks were and if I try will get a lot
better but fun suffers than.

JCthebigTree Enthusiast

JCthebigTree

Posted
Posted

Almost, but not quite, as perfectly seemless as my '07 Yukon.

 

Only thing is, when paying attention on a long (9 hour) highway drive, it barely ever kicks in on mine...unlike some, I'd like it to improve my mpg. Basically had to get on a long downhill for it to kick in, on m '07 Yukon it would kick in on every flat stretch.


Seems like it get back into V8 the instant I need it too...so no real complaints.

reldridg Enthusiast

reldridg

Posted
Posted

Strange, I could definitely tell when the MDS kicked in on my Hemi. Then I cut the factory muffler off and put a 14" Magnaflow on it, after that the MDS drone was horrible so I turned it off with a tuner.

I could probably not tell when it kicked in on my hemi motor because it probably never did. The fuel mileage on that engine was amazing I could get almost 10mpg and I drove it like a granny. What was even better was that it had about a 17-18 gallon tank so I could almost get far enough away from the house so that I could not walk back and get a gas can when it ran out of gas.

  • Like 3
bearman95 Enthusiast

bearman95

Posted
Posted

The only way I notice the switch is if I watch the read out on the dash. Its this way on both of my trucks. Very smooth and quiet.

2014big3 Enthusiast

2014big3

Posted
Posted

Of course its a problem! There only 33's. The better gas mileage I can get the more my wallet likes me.

 

I do realize that bigger tires+lift = bad mpg but I didn't go that big. It's expected but I took a pretty drastic hit on highway mpg. Either way I like the truck how it is now so nothing is going to change.

KUGG Naive is the problem. The V4 has no chance with your mods. It was designed first and foremost to fool the EPA with their indoor dyno ( no wind ) low speed testing. You fell on the wrong side of the razor's edge that it works on in real life flat hi way when you modified.

KUUG Enthusiast

KUUG

Posted
Posted

KUGG Naive is the problem. The V4 has no chance with your mods. It was designed first and foremost to fool the EPA with their indoor dyno ( no wind ) low speed testing. You fell on the wrong side of the razor's edge that it works on in real life flat hi way when you modified.

 

I guess if your going to start talking trash online you should first get the name right!

Designed indoor or outdoor I really don't care and that has nothing to do with my statements. But that's about all the conversation I will have with you; you're obviously not following anything I said.

mike94silverado Senior Enthusiast

mike94silverado

Posted
Posted

I drove 2 14's overnight while making the decision whether or not to buy one and it was seamless. to tell you the truth, It is in my 2010 too, and I have an insight monitor that shows it kicking on and off and you can't feel anything..... Maybe I got a defective truck? lol

TechSTL Enthusiast

TechSTL

Posted
Posted

I could probably not tell when it kicked in on my hemi motor because it probably never did. The fuel mileage on that engine was amazing I could get almost 10mpg and I drove it like a granny. What was even better was that it had about a 17-18 gallon tank so I could almost get far enough away from the house so that I could not walk back and get a gas can when it ran out of gas.

 

:rollin:

 

As someone else mentioned, the slower you're going, the more pronounced it its. On the highway at 60-70 mph, I don't feel it at all. I have a 5.3 with 3.42s.

 

At slow speeds, it feels like a shift.

bboyce536 Enthusiast

bboyce536

Posted
Posted

First time poster, but long time browser...

 

I definitely notice the switching between modes and unlike others, I seem to notice it more as the speed increases. It almost seems like my truck is trying to stay in V4 mode longer then it should..for example, on a small uphill I will start to put my foot in the throttle to keep my speed and it will stay in V4 so I keep pressing the gas and then it feels like it downshifts as it finally switches into V8 mode. Not sure if that's normal or not but it does bug me. This is my first GM with AFM...Kinda makes me miss my old 2011.

Stex Senior Enthusiast

Stex

Posted
Posted

'09, cannot tell if not for DIC. tested 2 14s cannot tell at any speed. I think you maybe feeling trans lag/slow tip in on getting going at lower speeds

rudapa Enthusiast

rudapa

Posted
Posted

Mine is almost unnoticeable unless I watch it on the dash. I'm fine with it so far. I can tell it is there if I try and quickly accelerate while in V4, there is a slightest hesitation. Not a problem though.

gmc1 Enthusiast

gmc1

Posted
Posted

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 understand.

 

So stick your name calling up your a@@ hate to see what you would say if i disagreed with you.

No reason we cant keep this friendly.

 

FYI its not the transmission that switches from V4 to V8 ---I think that may have been a typo on your part

so should I call you names now? I dont think that is how this forum goes..

 

One last thing----this is kind of funny----My name is Dick. So you can call me that all day just dont call

me late for supper.

 

 

Haha sorry Richard, I thought you were complaining about me complaining about my truck. I apologize for being a little kid resorting to name calling. And I see now where transmission replaced transition, thank you for bringing that to my attention. One bad thing about reading text, for me at least, (emails, actual text msg's, posts in forums, etc.) is that it's difficult to pick up on tones. I'll try and not jump to conclusions in the future.

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

    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Declaring victory would upset the demons that possess this Blazer, so I won't. But I did make progress today--after it put up a fight. Always a fight.   I had the day off so I spent the morning cleaning up the shop and I thought I'd get ahead of things by filling the cooling system in prep for the final part I needed to arrive: the driver's side knock sensor. Glug, glug, glug....and then the unmistakable sound of liquid hitting the shop floor. It induces the same chagrin when the sonar and targeting laser temporarily malfunction during a late night bladder evacuation over the toilet with the bathroom light off. D'OH!!! That made a mess...   Oh, hey, that knock sensor I removed? It threads into a wet port. Who knew?! Learn something new every day. Put a pin in that chore, I'll fill it the rest of the way later.   The knock sensor arrived at about 1pm. I threaded it in, connected the wire, filled up the coolant, checked for leaks, and... drumroll.... fingers crossed for a perfect start, excellent timing, model fuel trims, and ...no squeaks... Here goes.....   No, it didn't start. At all. I cranked it a few times and it wasn't sounding good. Furthermore, I heard leaking again. Jesus H Tapdancing Christ, stop leaking all over the dang floor. This time I had accidentally overfilled the coolant reservoir and the churn of the water pump via cranking caused a bit to burp out. Ok, just, breathe... Put the flamethrower down. Dang thing wouldn't burn anyway, leaks too much...   Did you know the rotation of a round crank sensor in a round hole, matters? I do now. Took me about half hour to retrace steps and realize what I had done. Then it started right up.   No squeaks. The squeak was the old balancer.   Once it entered closed loop, fuel trims are dead on, hovering right around zero at idle. No more -30%. I'll credit the injector rebuild on that one.   Timing? I think there's an OBD 1.5 translation error with my Actron scanner. It's anywhere from -20 to -30 at idle, sometimes as high as -40 cruising. Sorry, the engine just isn't running that smoothly at -40 degrees ignition advance. It's just not. It's smooth all through the rev range and has decent power. I'm going to have to trust the seat of my pants on this one.   The new exhaust is very quiet. The old catalytic converter? Not melted, but definitely not healthy. Rains glitter when you turn it on its end...all the precious metal is flaking out. Once the new exhaust system burned in/smoked off a bit, the engine's exhaust smell is normal again. Not that I'd recommend going around huffing car exhaust, but, you know what I mean?   One problem to correct. The new exhaust has the opposite problem of the old spliced up exhaust. It wants to hit the floor where the old one wanted to rest on the cross member. Happy medium, please? Still noodling on that one, need to look at how I can adjust some hangers.   I don't know what's next. On one hand I want to run away from this thing as far and as fast as I can -- there have been a lot of NOT fun moments. On the other, now that it kinda drives nice, maybe drive it around for a little bit?   Shhh... it's not currently dripping oil all over the floor. I can see just a little wet at the bottom of the timing cover where it meets the oil pan seal. It's not dripping multiple drops with every ignition cycle, in fact, after some driving this evening it has yet to even form a drop that could drip off yet. But the weekend is young... I fully expect this could turn into Exxon Valdez by Sunday. Because this Blazer hates me. LOL.      
    • Grumpy Bear
      The Peckish Synapse

      By Grumpy Bear · Posted

      About that:   Once upon a time in a land far far away lived a car company that was shy about taking your money and wanted to be sure that they gave you more that you asked for so that you'd come back. No really, not a fairytale. 😱   But after the field got thinned out enough to limit the competition it seemed good enough to give you only what you asked for. Fair enough I say but in such a market you have to give something the others are not or they go to the one who does. Gimmicks or glitz. Oh, fins and chrome. Yea, shinny crow like cars. Yum.    Field narrows a bit more and 'brand loyalty' becomes a thing and the minute it does they start thinking to themselves, "Could we make more money if we gave them less than they expect and they will hang in there for brand and comfort with the known?" They gave it a try and da*n, it worked!!    Well, what if we teach them, groom them into believing that less is "Normal" and cut some more corners. Will that work? Oh heck yea!    🤔 I wonder, can we give then WAY less than they expect and make them mad enough to spit nails and STILL get them to pay up? Sure, if we get everyone else to do the same so that the choice is less or nothing at all. How would be do that? Platform sharing.  What a concept, right?  Steal like there is no tomorrow and it's legal too!    Truth is no one is going to give up driving, not for very long. The Gen Z crowd is fine with it and will be as long as someone not Gen Z will haul them around. At some point we all die.    Economic voting only works if you cast a NO vote now and again and enough of them to get dumb and dumber to wise up. Well, that's how I was taught anyway. And it should have worked. Would have worked. But the Bail out!!   Look, you have another choice if  you take that bag off your head. If the dumb it down to some predetermined expectation of how John Q Public will use it the, that is under design it to failure they you use it to a lower stress mode. D'ho!    A 1950 Royal Enfield Bullet 500 will go anywhere a Suzuki Hayabusa will and for just as long. But you will have to treat it for what it is and not for what you wish it was. 
    • Vu1can
      Bridgestone vs Goodyear tires?

      By Vu1can · Posted

      Maybe I was just too unlucky, but I had nothing but bad luck with Bridgestones. Out of 3 sets, they all started losing a lot of air when they got down to about 1/2 tread life, and at that point also wet traction suffered more than it should have. Also, the only tire I ever had in my 60 years of driving that had a side wall blow out was a Bridgestone.   I'm currently running Goodyear Wrangler Workhorse AT and am very happy with them.   
    • davester
      Broke Down on the Mountain

      By davester · Posted

      maybe when the trip is over, check all the other joints in the front end, like all the ball joints, tie rods, pitman & idler arms, etc...
    • Carlos Eduardo Silva
      adding 360 surround view, UVI (Trailer Camera) package to UVS (Surround/invisible Trailer) Upgrade 2020 Silverado RST

      By Carlos Eduardo Silva · Posted

      Thks, and actually it was my bad, because here in this post there is someone showing the correct wire position as well. My bad... But thank you a lot with the help as well. I was able to find and buy a 10 channel VPM that came from a sister silverado of mine. The same year, same mode, same trim, same everything. 2022 Silverado 1500 LTD LTZ (pre-refresh). I also found to buy just the bottom mirror part that has the cameras, so way cheap than the full mirror. + a used front camera. I did test everything together, cameras, cables and the VPM.... everything worked EXCEPT my original Bed camera and the backup grid lines. I think the reason is because now I need to do the VPM reprogram. I sent a msg White Automotive & Media Service to confirm that it is the problem and that they can do it service for me case.   Once I get it 100% done I will post here result....

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...