My 2019 Tahoe developed an odd rattling noise from the engine bay. The issue was diagnosed as the engine making this noise when switching from 4 to 8 cylinders. I would hate to bypass what the vehicle is designed to do. Can the computer be reset so the AFM works properly??
IS AFM DISABLEMENT NECESSARY??
- Thread starter BigBee44
- Start date
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Marky Dissod
Full Access Member
To answer the title: technically, no, it is not NECESSARY.
(Although core / trunk exercises are not strictly necessary, my lower back regrets that line of thinking.)
There is no Engine Control Module 'reset' that can fix the mechanical problem you described.
To address the noise that your engine makes, requires physical / mechanical solutions.
The only way to do anything with your ECM to stop the mechanical noise your engine makes when half of it wants to take a break,
is to disable V4 mode in the pcm.
You ought to consider the possibility that there are good reasons why this forum has no negative reviews regarding competent engine / transmission tuning.
However, since you "would hate to bypass what the vehicle is designed to do"
maybe you would prefer pouring some Marvel Mystery Oil, or some other potential 'liquid solution' to your problem?
The mechanical solutions that would require changing parts will definitely cost more, and you will still be stuck with a bug that you think is a feature.
At least figure out how much money V4 mode saves you a week, and stash that away for when it fails,
or when it takes out your transmission.
(Although core / trunk exercises are not strictly necessary, my lower back regrets that line of thinking.)
There is no Engine Control Module 'reset' that can fix the mechanical problem you described.
To address the noise that your engine makes, requires physical / mechanical solutions.
The only way to do anything with your ECM to stop the mechanical noise your engine makes when half of it wants to take a break,
is to disable V4 mode in the pcm.
You ought to consider the possibility that there are good reasons why this forum has no negative reviews regarding competent engine / transmission tuning.
However, since you "would hate to bypass what the vehicle is designed to do"
maybe you would prefer pouring some Marvel Mystery Oil, or some other potential 'liquid solution' to your problem?
The mechanical solutions that would require changing parts will definitely cost more, and you will still be stuck with a bug that you think is a feature.
At least figure out how much money V4 mode saves you a week, and stash that away for when it fails,
or when it takes out your transmission.
Is it currently stock? If so, then any computer changes would make it run in V8 all the time.......much like most everyone here agrees with. They system you speak of is prone to issues with the lifters that fail on the V4 mode. Dirty oil seems to be the biggest culprit for failure. Keep it at 5k or less with a good filter and 5w-30 oil.......get rid of the 0w-20 garbage.
I thank you for your timely response to my issue. The information you provided is valuable to me and greatly appreciated. One more thing this was my first post in this forum and your obvious sarcasm was spot on. I laughed and re-read it several times.....
Thank you for the information. I will make sure that the oil changes continue to be timely with the proper oil.
Thanks again!!
Marky Dissod
Full Access Member
I don't think I'll ever be funny enough, but I'm funnier than what happens when V4 mode fails,
or when the TCC fails and takes out the transmission with it.
or when the TCC fails and takes out the transmission with it.
2015TahoePPV
Member
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- Apr 22, 2023
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here's another vote for get rid of the AFM system, speaking from experience
i bought the afm disabler that plugs in the diagnostic port... way nicer to drive, negligible difference in fuel mileage ..
2015TahoePPV
Member
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Its still going to have the weaker valvetrain components, but they will probably last longer.
fozzi58
Full Access Member
My AFM\DOD has been disabled since 18k miles with a tune (you don't need to go that route - just the disabler is fine). She's just flipped to 107k and a lot of hard miles on her. Factory valvetrain is still intact but I also change oil every 3k.
