Active Fuel Management Delete

The problem with AFM on the LS style motors ends up being the lifters. Turning off the AFM can be done in the tune very easily, but it will not get rid of the lifters that can fail. You have to pull the heads to change out the AFM lifters. I would not waste the money on that. Spend a couple extra bucks if you want it turned off and have a shop tune the vehicle that way you can actually get some more power as well.
 
What he said.

I got a quote for $300 for a street tune a while back on a L76. I'd pay that and get something else out of it.
 
NC-V said:
The problem with AFM on the LS style motors ends up being the lifters. Turning off the AFM can be done in the tune very easily, but it will not get rid of the lifters that can fail. You have to pull the heads to change out the AFM lifters. I would not waste the money on that. Spend a couple extra bucks if you want it turned off and have a shop tune the vehicle that way you can actually get some more power as well.
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So replace the lifters? Then have a shop tune it?
 
If you are that worried about it you can replace the lifters, but like I said you have to pull the heads to replace them. I wouldn't be that worried about it unless you are building the motor. Generally when they fail you will get some noise and a misfire on that cylinder, just replace them if that happens. The nasty problems usually arise from people trying to continue to drive it like that.

My recommendation would be to have a reputable shop do a good tune on it and turn off AFM/DOD. Then down the road if you decide to cam it or do engine work, swap the lifters out when you have it apart, or if something happens. They don't all fail, and it is a lot of work to go through just to change out 8 lifters.
 
NC-V said:
If you are that worried about it you can replace the lifters, but like I said you have to pull the heads to replace them. I wouldn't be that worried about it unless you are building the motor. Generally when they fail you will get some noise and a misfire on that cylinder, just replace them if that happens. The nasty problems usually arise from people trying to continue to drive it like that.

My recommendation would be to have a reputable shop do a good tune on it and turn off AFM/DOD. Then down the road if you decide to cam it or do engine work, swap the lifters out when you have it apart, or if something happens. They don't all fail, and it is a lot of work to go through just to change out 8 lifters.
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@NC-V do you have any shop recommendations around the concord area for the tune?

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I don't know if he officially opened his shop back up yet, but Heintz Racing. He used to be up here in Mooresville by the drag strip then sold the business. Now he is reopening down in Concord (closer to home) right behind the speedway. I will check with him and see if he is taking in normal customer work yet, but he does all of our LS swap hot rods.
 
ncsutj said:
@NC-V do you have any shop recommendations around the concord area for the tune?

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42Autosports is in Concord. Not sure who is doing the Customer Service/front end there now but if its Chris, tell him Stretch sent you or ask for Adam. We all went to school together at App.

Once my '16 is out of warranty I'll be having it tuned. Tuning out the AFM, turning down the Torque management and addressing shift points really improves the drive ability of all AFM/DOD trucks.
 
I got quotes from 42 Autosports and Heintz Racing. 42 was $100 registering vehicle with HP Tuners and $350 for the dyno and street tune. Heintz was $350. Will probably be taking it Heintz in January when the warranty runs out.

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Reviving this thread. @ncsutj Did you end up getting tuned? I know it's been a while. Thinking of jumping in on a HP tuner since I'm Ls swapping my restoration. We also have a 16 Yukon that I would like to play with.
 
orange150 said:
Does turning off the AFM/DOD from a tuner, without replacing the lifters, actually help extend the life of the engine?
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I believe the accepted thought is the lifters are most likely to fail on a transition from 4 cyl to 8. If you electronically eliminate, they don't transition therefore lowering the probability of failure.

But... :confused:

We have it turned off on my mom's 2007 Yukon XL, which greatly helped oil consumption.
 
LBarr2002 said:
I believe the accepted thought is the lifters are most likely to fail on a transition from 4 cyl to 8. If you electronically eliminate, they don't transition therefore lowering the probability of failure.

But... :confused:

We have it turned off on my mom's 2007 Yukon XL, which greatly helped oil consumption.
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I have it turned off on our 11 suburban, and I was really surprised how much it helped with oil consumption. It's already got 190k on it, probably had it turned off the last 2 years, so no idea if it will extend life any if at all, but at least I don't have to add oil every month.
 
I ended up turning mine off on my 17 with a handheld tuner. I think it’s still in the toolbox and will check when I get the chance. Pretty sure it was the Diablosport unit. Before and after was noticeable. Firmer shifts, less searching for gears and the lag between engine and trans as the AFM turned on and off made it much better to drive and tow with. I’m sure more could be squeezed out of a custom tune but it worked well. Oil consumption dropped as soon as I turned off the AFM. Did the tune at 30ish Thousand miles and traded in on the Ram at 90. No issues in those 60k.
 
I had PCM / Mooresville, do a Street Tune, on my 2016 LS 6.2. Turns of the delete, raises some power, & tunes the transmission for better shift points & pressure. They only do GM & Chevy. Use HP Tuners. Turned my Hot Rod, into a Rocket ship! They wouldn't run it on their dyno, due to being a pick-up. Said they had had driveshaft failures. Ok, whatever. But, the downside is my fuel mileage dropped 2 - 2.5 mpg! I put up with that until lately, & said to heck with That! They agreed to check it & retune or do whatever it takes, free. They claim, they haven't seen a mileage decrease like this. But now running winter gas it's been 3 mpg less. They checked it out & found nothing wrong, so they returned the engine to factory specs, less the delete feature. I haven't had a good highway run yet, but just returning home & my regular driving, has increased 1 - 1.5 mpg!
 
rodney eppes said:
I had PCM / Mooresville, do a Street Tune, on my 2016 LS 6.2. Turns of the delete, raises some power, & tunes the transmission for better shift points & pressure. They only do GM & Chevy. Use HP Tuners. Turned my Hot Rod, into a Rocket ship! They wouldn't run it on their dyno, due to being a pick-up. Said they had had driveshaft failures. Ok, whatever. But, the downside is my fuel mileage dropped 2 - 2.5 mpg! I put up with that until lately, & said to heck with That! They agreed to check it & retune or do whatever it takes, free. They claim, they haven't seen a mileage decrease like this. But now running winter gas it's been 3 mpg less. They checked it out & found nothing wrong, so they returned the engine to factory specs, less the delete feature. I haven't had a good highway run yet, but just returning home & my regular driving, has increased 1 - 1.5 mpg!
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I used them to turn off AFM & I plan to use them if/when I mechanically delete the "feature"...pleasant experience & cheaper than other tuners in the area.
 
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