I dont even know how to observe it, an 07 impala I drove would tell you if it was v6 or v3, but I cant seem to find anyway to view what it's doing on this truck, but runs like a v6 all the time to me, just a 2018 WT trim though maybe the salesman was wrong and I dont have it

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I have a WT also. I don't think we have the indicator.

 

I was always curious about this active fuel managent. But I haven't noticed a darn thing, not in gas mileage nor in performance..

 

On +2017 trucks above base level for sure, but possibly on later WT/base levels the "V6" indicator on the DIC will display a green "V4" indication when the engine enters that mode.
This will usually occur under light loads such as driving at steady speed on a flat road or, sometimes at highway speeds, again at light or no load on generally flat roads.
This has been discussed in a number of threads here. Using the "Search" function such as *V4* should reveal some of those threads.


https://www.coloradofans.com/forums...vrolet-colorado-forum-2015-gmc-canyon-forum/332089-v6-go-into-v4-mode-much.html

 

On +2017 trucks above base level for sure, but possibly on later WY/base levels the "V6" indicator on the DIC will display a green "V4" indication when the engine enters that mode.
This will usually occur under light loads such as driving at steady speed on a flat road or, sometimes at highway speeds, again at light or no load on generally flat roads.
This has been discussed in a number of threads here. Using the "Search" function such as *V4* should reveal some of those threads.


https://www.coloradofans.com/forums...vrolet-colorado-forum-2015-gmc-canyon-forum/332089-v6-go-into-v4-mode-much.html

I actually searched the forum extensively because I did not want to make a duplicate post, I used "AFM and "Active Fuel Management", but did not think to search for V4, so sorry for starting a new thread.:wink2:

I have the LGX in a 2017 XT5 which is the same engine as your LGZ. As I recall, when the car was new, I did not see V4 in the first 1000 miles. Now it goes into V4 very frequently when driving steadily at speeds below 45 mph. Above that, you will not see V4 because it needs all six cylinders to maintain speed. The shift between V6 and V4 is so smooth you will not feel it and know it is in V4 by seeing the V4 indicator on the Trip 1 or 2 or one of the DIC screens where you normally see the V6.

That's good to know - I have about 300 miles on the Odometer. Hopefully it kicks in to V4 mode more after a break in period. I have purposely put the cruise on a bunch of times and checked if it went into V4, and have never observed it in that situation. Where I live in NW Ohio we have flat land, so I am hoping to see V4 a lot more often.

You have to have the center screen set to show TRIP A or TRIP B and it will show V4 or V6 in bottem corner. On my ZR2 it only uses V4 on a dead flat road in a 25 or 35 mph zone or if coasting down hill.

Yes, TRIP B is my default DIC.

Bill

 

I was hopeful that when driving conservatively the truck would operate in V4 mode more frequently. For mine ('17 Z71) the screen between the gauges will show V4 instead of the V6 that's displayed there (bottom right corner if memory serves). I usually have my screen set to trip A which shows me the info I typically care about. That said, the truck rarely enters V4 mode. I typically notice it when cruise control is set and I'm cruising on flat terrain or a decline. Once in V4 mode, I've noticed that even the slightest bit of acceleration will kick it back into V6 mode. So if you're not using cruise control, I could totally believe that you wouldn't see V4 mode much if at all.

I'm still not bothered too much by all of this. Not long ago I was in a 96 cherokee 4.0H.O.. My commute these days in the Z71 is triple what it was when I was rockin the Jeep, and my weekly fuel expense is almost identical.

 

I just read that thread posted above. It comes down to this, the active management thing is a big hoax! Lol. Confused back then and still confused now...

 

I have the LGX in a 2017 XT5 which is the same engine as your LGZ. As I recall, when the car was new, I did not see V4 in the first 1000 miles. Now it goes into V4 very frequently when driving steadily at speeds below 45 mph. Above that, you will not see V4 because it needs all six cylinders to maintain speed. The shift between V6 and V4 is so smooth you will not feel it and know it is in V4 by seeing the V4 indicator on the Trip 1 or 2 or one of the DIC screens where you normally see the V6.

 

I now have about 1,000 miles on my truck and I am noticing V4 mode a lot more often now, especially when I am off the throttle and coasting down a slight grade and in the 45 MPH range. I think there must be some sort of break-in period.

Bill

 

You have to have the center screen set to show TRIP A or TRIP B and it will show V4 or V6 in bottem corner. On my ZR2 it only uses V4 on a dead flat road in a 25 or 35 mph zone or if coasting down hill.

 

I've only got 700 miles on my 2018 Z71.

I've seen the V4 light a few times, downhill in a 40 zone and a couple of times when downhill on the interstate both with and without cruise. No noticeable difference other than the lights change.

I've got a long highway trip coming next month and intend to watch for it then.

 

I've got a long highway trip coming next month and intend to watch for it then.

You are unlikely to see the V4 at highway speeds, unless the speed is less than 45 mph. That has been my experience with my XT5, but then the truck may be geared differently.

 

With my 2018 I've noticed it more in town driving between 20-30 at a steady pace than I've ever seen it on the highway. I can maintain speed for a significant amount of time in V4 at 26 mph on City streets as long as I don't stop. Seems like you hit a point in slow down they it goes back to 6 regardless.


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I rarely comes on. AFM is a gimmick that adds complexity to engines for a minimal gain in fuel economy anyways.

 

If you drive with th you footbon the gas even a little V4 will not come on.

It is only the lightest trottle it will stay in v4 most times it is flat roads, coasting and any other unloaded drivetrain condition.

I can kick mine on at will coming to the top of a hill by lifting before cresting. It will remain on v4 till I start back on the gas.

What many misunderstand this is not fully for gas mpg gains.

The manufacturers are able to earn more so-called “off-cycle credits” for technology that saves fuel by shutting off the engine when it is not needed.

Just having the system makes the goverment see the engine as cleaner as they spot it credits for having the system. That is why it is not in much and really affects mpg in only a small way.

Here this explains it better than I can.

https://nepis.epa.gov/Exe/ZyNET.exe...rchBack=ZyActionL&Back=ZyActionS&BackDesc=Results page&MaximumPages=1&ZyEntry=2

 

The v4 mode is most likely tuned for the EPA mileage testing which is between 48 and 60 for highway - if I remember correctly. I took a trip to Myrtle Beach Thursday/Friday and on the Interstate, I saw it kick into V4 mode a few times, lets just say I averaged ~70 MPH. Once you get off the Interstate the speed limit is between 50 and 60 and in these zones the V4 mode kicked in a lot more often. This gives me a pretty good indication that the V4 mode is tuned for the EPA butter zone.

With the rounding factor that is applied to the EPA mileage tests, the difference between 25.4 and 25.6 can be significant in other overall fleet rating as they round 25.4 down to 25 and 25.6 up to 26.

 

The v4 mode is most likely tuned for the EPA mileage testing which is between 48 and 60 for highway - if I remember correctly. I took a trip to Myrtle Beach Thursday/Friday and on the Interstate, I saw it kick into V4 mode a few times, lets just say I averaged ~70 MPH. Once you get off the Interstate the speed limit is between 50 and 60 and in these zones the V4 mode kicked in a lot more often. This gives me a pretty good indication that the V4 mode is tuned for the EPA butter zone.

With the rounding factor that is applied to the EPA mileage tests, the difference between 25.4 and 25.6 can be significant in other overall fleet rating as they round 25.4 down to 25 and 25.6 up to 26.

I think you are on to a good point there. The way EPA counts numbers, testing method, etc can result in vehicle makers "adjusting" engine parameters, shift points, etc to optimize for the testing conditions. And the rounding as you mention would certainly be one of those.

 

While the AFM May contribute some MPG the key is the off cycle credits earned for Carbon Dioxide credits.

Systems in today’s cars that contribute to them being more efficient and less polluting can not always be measured in EPA testing. So they document these systems and the EPA designated credit to the vehicle for being cleaner than the regular testing shows.

Off cycle credits can be earned by AFM, solar reflective glass. The shutters on the front of the V6 trucks. The big one is the auto stop as it is becoming more and more common. The EPA will also include lighter more efficient lighting systems and even cooling seats.

There is even more to this as like everything else it is no longer simple.

I believe even the skip shift was also counted as a off cycle credit. Well before most of us defeated them.

 

Mine comes on a few times during my daily commute on the highway so I dont think its speed dependant at all. I will echo what others have mentioned though that it is severely throttle dependant. If i have cruise set (usually 65-70mph) and the terrain is just right I'll see it come on during the same parts of my drive. A couple milimeters of pedal though and it'll hop back into V6 mode. Even turning off cruise control seems to deactivate it. Maybe the slowing down causes some engine braking to occur which forces it out?