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Disable AFM

Should have done it long ago!!

Disable AFM

Postby JRod627 [OP] » Jun 16 2012, 3:52pm

I kept running across forums on disabling the AFM function on my '09 GMC SIerra SLE. The switching back & forth from V4 to V8 was killing me. So, I check was my Superchip rep. & sure enough, the flashpaq 2865 series programmer I am using is able to disable the function. So, I did. And, its been about a week & it has waken my 5.3L up! MPG is still unsure, but it seems better. I just want to make sure before I tell yall it is. So, just FYI, I should have done this a long time ago!!
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5.3L V8 / DROP IN K&N / SUPERCHIP FLASHPAQ 2865
MAGNA FLOW 40 SERIES SINGLE IN/DUAL OUT
2.5" LEVELING KIT (STRUT SPACER)
305/55/20 ATZ BAJA MICKEY THOMPSON
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Re: Disable AFM

Postby EKinMN » Jun 16 2012, 7:51pm

Keep us posted on the MPG. I would imagine it will drop, but I am curious by how much.
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Re: Disable AFM

Postby xMOWERYx » Jun 16 2012, 8:38pm

Don't hold your breath on the mpg being good. I have a DS predator tuner set on MPG booster with AFM off and it did decent for the first couple of days and then the MPGs dropped
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Re: Disable AFM

Postby allterrainjoe » Jun 16 2012, 9:21pm

xMOWERYx wrote:Don't hold your breath on the mpg being good. I have a DS predator tuner set on MPG booster with AFM off and it did decent for the first couple of days and then the MPGs dropped


How much did your mpg change :?: :?:
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Re: Disable AFM

Postby JRod627 [OP] » Jun 17 2012, 3:08am

I was getting around 11-13 mpg before disabling the AFM. Afterwards, & a week later, getting around 15-16. But, most likely due to how i have been driving. I'll give y'all an update soon though.
'09 GMC SIERRA SLE~RWD~FLEX FUEL
~PLATINUM EDITION~CHROME PACKAGE
5.3L V8 / DROP IN K&N / SUPERCHIP FLASHPAQ 2865
MAGNA FLOW 40 SERIES SINGLE IN/DUAL OUT
2.5" LEVELING KIT (STRUT SPACER)
305/55/20 ATZ BAJA MICKEY THOMPSON
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Re: Disable AFM

Postby 06MonteSS » Jun 17 2012, 7:01pm

xMOWERYx wrote:Don't hold your breath on the mpg being good. I have a DS predator tuner set on MPG booster with AFM off and it did decent for the first couple of days and then the MPGs dropped


uhhhh, the MPG booster tune makes changes to AFM/DOD so that it stays in 4 cyl mode more to get you better mileage for highway driving, so if you disabled/turned off the AFM, then you totally killed the purpose/point of the MPG Booster tune man haha....

if you use the MPG Booster tune, you need to leave the AFM/DOD alone, leave it on....
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Re: Disable AFM

Postby JRod627 [OP] » Jul 14 2012, 4:08pm

Uhhhh, I'm not using the MPH Booster Tune bud. I ALWAYS run a high octane 92 w/ the performance tune. (SuperChip Value) And I've had the AFM off for awhile now & my truck runs a lot better. I turned it off bc the stupid thing didn't work like it should when it was in stock. I would think the jumping back & forth in & out of v4 to v8 would cause more problems & prolly burn more gas. But I could be wrong.
'09 GMC SIERRA SLE~RWD~FLEX FUEL
~PLATINUM EDITION~CHROME PACKAGE
5.3L V8 / DROP IN K&N / SUPERCHIP FLASHPAQ 2865
MAGNA FLOW 40 SERIES SINGLE IN/DUAL OUT
2.5" LEVELING KIT (STRUT SPACER)
305/55/20 ATZ BAJA MICKEY THOMPSON
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Re: Disable AFM

Postby 06MonteSS » Jul 14 2012, 4:14pm

yeah, but you have a superchips programmer... not the same tunes as what the diablo tools have ;)
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Re: Disable AFM

Postby JRod627 [OP] » Jul 14 2012, 5:38pm

I can't argue w/ that! One day I'll swap over to y'all. To be honest, Superchip never really impressed me. I've heard some good things about diablo & bully dog. Hopefully one day.
'09 GMC SIERRA SLE~RWD~FLEX FUEL
~PLATINUM EDITION~CHROME PACKAGE
5.3L V8 / DROP IN K&N / SUPERCHIP FLASHPAQ 2865
MAGNA FLOW 40 SERIES SINGLE IN/DUAL OUT
2.5" LEVELING KIT (STRUT SPACER)
305/55/20 ATZ BAJA MICKEY THOMPSON
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Re: Disable AFM

Postby BlackZ71Silverado » Jul 14 2012, 8:43pm

xMOWERYx wrote:Don't hold your breath on the mpg being good. I have a DS predator tuner set on MPG booster with AFM off and it did decent for the first couple of days and then the MPGs dropped



That's because it's designed to work with AFM............I have had mine disabled and gained .5-1mpg depenging on how I drive. That's with 87 Octane tune and tranny settings at -4 through all gears and -2 on WOT.

If you turn the AFM back on with that tune, your mpg numbers will be improved.
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