2016 Chevrolet Tahoe 5.3 best way to deactivate AFM

Have to replace the camshaft and lifters with a non AFM set of parts. Then program the the AFM out of the PCM. If you don't replace the internal parts you will have misfire codes to deal with.

Reprogram with HPTuners. No parts need to be replaced - DoD lifters essentially become “normal”.

Hi Jeff, So what happened here? scanshare​.​io/share/6kqNM3DO… Customer had another guy do a “delete” that supposedly knew what he was doing and used OEM parts? As it turns out he said he had replaced the camshaft, but he did not. Non AFM lifters, lifter trays, VLOM block off plate were replaced, but the camshaft was not. That guy didn't do programming so it was brought to another place that…

I wouldn't be able to tell you what happened in the programming by looking at a scope file. I need to see the calibration itself. I do these all the time, and the ones that fail that other people do are always because they don't write the whole calibration. They're scared when they see the message that says "brickable"

Hi Jeff, Here's the file I used. Can you tell me where I screwed up? I edited my post above to include the fact that the camshaft was not replaced. The scan data was after I was done with modifying the program with HP Tuners. Thank you!

HP Tuner can disable. Are you sure its not your Torque Converter tho? 6l80 are notorious for Converter Failure and shudder is one of the symptoms

Jasper also has the software to disable.

We do EFI live tunes all the time and block the oil port to the AFM under the oil pressure sensor with special sleeve. Go to crazed performance in MN has a lot of good videos on popping stuck lifters without pulling the head and he sells the sleeve and tool to do it. We do lots of these and it saves a lot of time and customers love it. I realize you dont have a stuck lifter so just doing the…

Get a range device and plug it in and done

Hi Sid, I don't know if the newer ones do this, but a few years back a customer installed one of these and he needed a smog test. The Readiness Flags would not complete testing with this plugged into the DLC. Unfortunately he lost a lifter on cylinder 1 with this unplugged.

If the vehicle has no AFM troubles at this time, and you want to prevent a future problem, I would install this. amazon​.​com/TECHNOLOGY-AFM…

Diablo also has the software to do program delete. Used it on my wife's Avalanche after my brother-in-law gave me a Diablo that comes with the Jasper 5.3's he does. Had a few laying around. Just had to pay small subscription fee to add Vin.

Or for the time being, keep it out of over drive and AFM will not activate.

The only method that doesn't create more problems than it resolves is programming it out. By removing the DoD functionality with HPTuners, you kill all of the DTCs and avoid the readiness issues.

Jeff, Does removing the AFM with HPTuners eliminate the misfire problems I've seen on vehicles that are still running the OEM cam and lifters? I've had several customers ask me about deleting the system and I've told them the cam and lifters will need to be replaced too. I base that recommendation on the vehicles I've seen with misfire codes setting after the AFM has been programmed out of the…

If the lifters/cam were broken before the delete, they will continue to be so after. Otherwise, no - programming it out simply turns off the demand for the deactivation, so all fueling/spark change subroutines wont get called.

Well, that hasn't been my experience. I've seen at least 15 trucks that have misfire codes on the delete cylinders after the AFM programming delete was performed, just like in Scott Chase's reply above. My brother wanted his truck done so I tried it using HPTuner and had to put it back to OEM after he drove it for a few days and had misfire codes set. There was nothing wrong with his truck…

I do one or two of these a month, every month, for the last 7 or 8 years. I've never had one show misfires after the delete. Remember you're not just deleting the control of the solenoids. You're actually turning off the DoD system in the OS and doing a full reflash, not just calibration update. I guarantee you that's what you're doing wrong. BTW - I'm driving in a 5.3 powered Trailblazer in…

Do you have to buy the file every time you do one?

“File”? No. I edit each vehicle manually. It is 2 or 3 HPT tokens at $50 each if you don't have the unlimited license.

Thanks, I tried to get someone from HP Tuners to call me so I could ask this, but no dice.

John call down to my shop. I can show you/walk you through it.

Jeff, I went back through my records and I think I might have found what the issue is. From what I understand from reading your posts here, you are performing the delete on good running vehicles and leaving the original parts in place, the camshaft and DoD style lifters are still there, you are just modifying the way the PCM acts. Is that correct? The vehicles I've seen with problems have had…

Eric, Could you provide some specific info for the benefit of others? What year trucks? All 5.3 L83? Did engine actual have misfires or just generate misfire codes? I just did a 2014 Siverado DOD disable using HpTuners and no customer complaints so far. Also, disabled TCC activity for 1 -4 gears to minimize/eliminate premature TC failures (installed a GM reman trans). Customer noticed truck…

Over a year with the Diablo flash and no issues. Perhaps the others you have read about having issues may have been a bit too far gone mechanically for the delete to make a difference?

Do you mean you used gds2 to temporarily keep AFM from activating during test drive or program it out all together?

Paul, Yes just for test drive to verify. Easy way to test.

Its probably worth noting here that deleting AFM/DoD is for “off road use only”. YMMV