It turns your engine into a V4 for fuel economy but has some inherent problems
That’s what I thought, but I thought it was called ACM-Active Cylinder Management.
I'm a master certified mechanic and I've worked on these systems for quite a while. I've found that the only people who are having problems with the AFM are the ones that don't change their oil regularly. I change my oil every 7k miles and I use full synthetic, I have 235k miles on it and it purrs like a kitten.
Might be disabled, as you note. I think the motor and trans need to be up to operating temp, then try cruise control around 35-40mph on flat ground. This is when I would see it kick over to V4 mode. It would rarely, if ever, kick over to V4 at highway speed for me.
TBH, for my type of driving I may just not be a candidate. I get in operating temp all the time but I'm either in stop/go or blowing down the interstate at 70+. I use my cruise at times but it's always 65 and above. I live in mid TN and me, wife and kids went on a hike a week or two ago and it was about 100ish miles each way but 84 of them were interstate heading to east TN in the hills at interstate speeds.
What tuner did you go with?I've put close to 70k miles on my '07 5.3 LT since I got it in 2016 (my truck now has 140k miles on it.) I always change my oil when the DIC says I'm down to 25% oil life, which usually equates to around 6k miles. I use Mobil 1 5W-30 exclusively, and only lose around 1qt between changes. AFM has been active on my truck since I've owned it, but I would drive around town with the gear selector in "3" instead of "D" to keep the AFM from activating. On the highway I would always use "D" and it would cycle in and out of 4cyl mode. I finally got myself a tuner for Christmas that allowed me to disable the AFM. Now I can drive around in "D" all the time and the AFM never activates. Gives me peace of mind and keeps the Flowmaster 40 series sounding great.
I also flashed an 87 octane performance tune on my truck, which has totally changed the driving experience for the better.
I used the Diablo Predator 2 on mine, it was about $395.00 with tax and all. I've been playing with it for a couple of weeks and it's Great. There is so much you can do with it, I'm still working on getting the perfect setup and I'll post on here what I think others might want to do with their own tunner. We have a few people on here that have the same tunner as mine. That's why I went with the Diablo Predator 2 and the reviews on it were better than any other one that I looked at.
Same - DiabloSport Predator 2 Model 7202. Got it for $325 at Christmas. I agree with Crunch - there's lots you can do with it. I was skeptical at first that it would make much of a difference - my main focus was disabling the AFM - but after putting the tune on my truck I was pleasantly surprised. It is noticeably more responsive to throttle input and the shift point changes work really well. I used to have to bury my foot into the accelerator to get Bruce to move, and then I would get the 2 gear downshift which would send the RPMs screaming, but now it downshifts right when I expect it to. It's much more drivable. Don't know why I waited so long to get one.
Same - DiabloSport Predator 2 Model 7202. Got it for $325 at Christmas. I agree with Crunch - there's lots you can do with it. I was skeptical at first that it would make much of a difference - my main focus was disabling the AFM - but after putting the tune on my truck I was pleasantly surprised. It is noticeably more responsive to throttle input and the shift point changes work really well. I used to have to bury my foot into the accelerator to get Bruce to move, and then I would get the 2 gear downshift which would send the RPMs screaming, but now it downshifts right when I expect it to. It's much more drivable. Don't know why I waited so long to get one.
Same - DiabloSport Predator 2 Model 7202. Got it for $325 at Christmas. I agree with Crunch - there's lots you can do with it. I was skeptical at first that it would make much of a difference - my main focus was disabling the AFM - but after putting the tune on my truck I was pleasantly surprised. It is noticeably more responsive to throttle input and the shift point changes work really well. I used to have to bury my foot into the accelerator to get Bruce to move, and then I would get the 2 gear downshift which would send the RPMs screaming, but now it downshifts right when I expect it to. It's much more drivable. Don't know why I waited so long to get one.
