2016 Chevrolet Tahoe 5.3 best way to deactivate AFM

Michael Owner Connecticut Posted   Latest   Edited  
Resolved
Propulsion
2016 Chevrolet Tahoe LS 5.3L (C L83 Gas) 6-spd (6L80)
Shudder While Driving When Afm Goes From 4 To 8 Cly

Anyone know how to disable AFM completely truck has 205k do not want to take motor apart.

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Eric Owner/Technician
Wisconsin
Eric
 

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.

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Jeff Owner/Technician
Arizona
Jeff
 

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

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Scott Owner
California
Scott
   

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…

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Jeff Owner/Technician
Arizona
Jeff
 

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"

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Scott Owner
California
Scott
 

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!

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Sergio Mechanic
Texas
Sergio
 

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

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Jeff Owner/Technician
California
Jeff
 

Jasper also has the software to disable.

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Loren Manager
Missouri
Loren
   

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…

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Helpful
Sid Technician
Ontario
Sid
 

Get a range device and plug it in and done

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Scott Owner
California
Scott
 

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.

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Dwight Owner/Technician
California
Dwight
 

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…

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Paul Mechanic
Illinois
Paul
 

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.

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Paul Mechanic
Illinois
Paul
 

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

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Interesting
Jeff Owner/Technician
Arizona
Jeff
 

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.

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Eric Owner/Technician
Wisconsin
Eric
 

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…

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Jeff Owner/Technician
Arizona
Jeff
 

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.

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Eric Owner/Technician
Wisconsin
Eric
 

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…

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Jeff Owner/Technician
Arizona
Jeff
   

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…

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John Owner/Technician
Iowa
John
 

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

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Jeff Owner/Technician
Arizona
Jeff
 

“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.

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John Owner/Technician
Iowa
John
 

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

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Andrew Owner/Technician
Iowa
Andrew
 

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

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Eric Owner/Technician
Wisconsin
Eric
 

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…

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Ted Owner
Texas
Ted
 

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…

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Paul Mechanic
Illinois
Paul
 

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?

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Michael Owner
Connecticut
Michael Resolution
 

First Thank you everyone who replied. Yes it is the AFM truck came from a shop who installed OEM complete trans. I was able to disable the AFM with gds2 and no shudder. After all the great information from everyone I quoted customer $399 to use HP delete and re-flash. He said he would drive it to see if gets worse. I will update more if he returns

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Paul Mechanic
Illinois
Paul
 

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

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Michael Owner
Connecticut
Michael
 

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

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Jeff Owner/Technician
Arizona
Jeff
 

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

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