GM's Active Fuel Managment Syatem

tex78 said:

How come he wants to disable it


Cheap way would be to drive around in tow haul, won't kick in with tow haul on





that's not true, I am driving my model year 15 with tow/haul mode engaged and it will kick into 4 cylinder mode....6.2L mind you....shouldn't matter though

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tex78 said:

How come he wants to disable it


Cheap way would be to drive around in tow haul, won't kick in with tow haul on

sent while drinking tea's

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Iron Horse Racing said:

He heard it will damage his motor, a quick search and there are lots of posts talking about high oil consumption, lifter issues, seems like most of the complaints were from older trucks, but some reports it's still happening...

truck has 15,000 km and has been using a bit over a quart every 5,000, GM tells him its normal....

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Iron Horse Racing said:

Father in law wants to delete his AFM on his 5.3L in a 2016 Silverado.

Has anyone used Range Technologies AFM disable device? or any other method to disable...

I would assume a mod like this would void warranty?


v8 – Range Technology | AFM Solutions for GM Cars, Trucks & SUVs


PS....looking for information, post your brand bashing in the appropriate post....

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MK4TDI said:

I've heard mixed reviews on the range unit. Some like it and some wish they had just gotten a tune instead.

I've got a 15 with the 5.3 and the 6spd and didn't like the hesitation that came with the AFM or how when it switches between 4 and 8 it feels like the transmission shifts. This is I find is more apparent with the 8spds now too.

For in town driving you can put the gear selector in manual and select gear 5 for the 6 spd's and I'd assume 7 for the 8spds and it keeps the AFM tuned off. Once you Put it in overdrive the AFM will kick back in.

Myself I went with a custom tune from Blackbear Performance. Turned off the AFM, adjusted the speedo for tire size and had the transmission tuned. Night and day difference in the driving, transmission doesn't hunt for gears or get confused shifting anymore. The tuner also backs as a full code reader too which is a very nice bonus. Tunes and adjustments can be emailed back and forth which is also excellent.

I to read up on the lifters giving issues in some vehicles, but didn't think it was that big of a deal. This truck however doesn't burn much oil at all, I add maybe a 1/4 litre in 15000km. With the direct injection though the oil does get dirtier quicker.

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X-Treme said:

Just a heads up. On the older ones with issues, it was usually due to the lifters being housed in PLASTIC (WTF) "guides". With engine heat, etc, the lifters would spin in those guides. Being roller lifters, this takes out a camshaft REALLY fast.

Disabling DOD is not gonna do anything to combat hard parts failing.

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Cdnfireman said:

Thats unacceptable. With the modern machining/manufacturing methods and the greater quality of lubricants there's no reason for a modern engine like his to burn oil. (Other than perhaps a very brief break in period).
That cylinder deactivation idea has been problematic for a lot of people. Hopefully he finds a solution.

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tex78 said:

No, actually it's the cam had no or very little hardening surface, hence why a cam over the counter is 197 bucks, where a roller 350 vortex cam was 900

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Cdnfireman said:

I don't buy that the newer lubricants are junk. I do agree that the extended oil change intervals happening due to the rediculous "oil life monitors" may be a contributor to the condensation contamination seen inside some engines. Most engines are going way longer now than they ever did before, assuming proper maintenance. Short trip driving and poor maintenance together are bad news. In this climate the oil should be changed a minimum of twice a year, and maybe more depending on mileage and usage.

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neilsleder said:

You add a 1/4 of a litre in 15000km? That should be 3 oil changes! I hope you meant to say 1500.


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MK4TDI said:

No sir that wasn't a typo, I pull an oil sample at 7000 km and 14000km and change at 15000. If you include those two samples I add 12 Oz total of oil between oil changes. I don't have time to be changing oil every 3 weeks in the summer months.

On my 05 5.3 I'd run 20,000 km between changes with oil samples at 6500, 13,000 and 19,500.

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tex78 said:

No, actually it's the cam had no or very little hardening surface, hence why a cam over the counter is 197 bucks, where a roller 350 vortex cam was 900

The new oils are too thin, like piss water even cold, they don't have any zddp ( zink, which is the metal to metal contact barriers) all for energy conservation ( like . 5 a % better economy on gas)



sent while drinking tea's

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neilsleder said:

I dis like the new 5 20 oil way to thin.


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