How To Tell When AFM Is Activated? - GM

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Gen III & Gen IV V8 Engines (LS-Based)

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1999-2013 Silverado & Sierra (GMT800 & GMT900)
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Gen III & Gen IV V8 Engines (LS-Based)
How to tell when AFM is activated?

How to tell when AFM is activated?

By bdox August 16, 2012 in Gen III & Gen IV V8 Engines (LS-Based)

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bdox

Posted August 16, 2012

bdox

Member
- 32
Location:Ontario, Canada
Gender:Male
Drives:2009 Silverado 1500 Z71 GFX

Posted August 16, 2012

I bought my '09 Silverado CCSB Z71 a little over 2 months ago, and I have yet to see/hear/feel the AFM kick in. I was wondering if there is an indicator of some kind to let you know it's been activated?

I have a MBRP dual exhaust and sometimes when on the highway, after coasting or while using the cruise, when I step on the gas I can hear something happening through the exhaust. It's like a drone sound until the RPMs come up, either through down shift or gradually accelerating.

BTW, I have the LC9 engine, MYC transmission. Also have RPO "SAB".

jdubub

Posted August 16, 2012

jdubub

Member
- 1.5k
Name:Josh
Location:Dallas TX/ Houston TX
Gender:Male
Drives:2010 Chevy Z71

Posted August 16, 2012

Check in the DIC, the buttons on the left of the wheel on the dash. Push the top button until you see the "instant" MPG and next to it will say V8, or V4 whenever it is in one of those.

JrocK817

Posted August 16, 2012

JrocK817

Member
- 418
Name:John
Location:Depew, NY
Gender:Male
Drives:2015 Silverado Crew Cab

Posted August 16, 2012

I bought my '09 Silverado CCSB Z71 a little over 2 months ago, and I have yet to see/hear/feel the AFM kick in. I was wondering if there is an indicator of some kind to let you know it's been activated?

I have a MBRP dual exhaust and sometimes when on the highway, after coasting or while using the cruise, when I step on the gas I can hear something happening through the exhaust. It's like a drone sound until the RPMs come up, either through down shift or gradually accelerating.

BTW, I have the LC9 engine, MYC transmission. Also have RPO "SAB".

Consider yourself lucky.. i feel it switch back and forth ALL THE TIME! mostly between 30-45 mph.

Agree with JDub.. check your DIC "Instant MPG"

SouthCo

Posted August 16, 2012

SouthCo

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- 1.6k
Location:Maryland
Gender:Male

Posted August 16, 2012

I bought my '09 Silverado CCSB Z71 a little over 2 months ago, and I have yet to see/hear/feel the AFM kick in. I was wondering if there is an indicator of some kind to let you know it's been activated?

I have a MBRP dual exhaust and sometimes when on the highway, after coasting or while using the cruise, when I step on the gas I can hear something happening through the exhaust. It's like a drone sound until the RPMs come up, either through down shift or gradually accelerating.

BTW, I have the LC9 engine, MYC transmission. Also have RPO "SAB".

I have a 2010 crew cab LC9 with corsa exhaust. Switch the DIC to instant economy (or whatever its called) and it will show v8 or v4 above the mpg. That cruising and you step on it and hear the drone before the rpms go up is it going from V4 to V8. Mine does it too. I can't tell my AFM kicked in unless I hear that noise when it's coming back to V8 or unless I look at the DIC. I can't feel it and wonder if those who do have something wrong.

SouthCo

Posted August 16, 2012

SouthCo

Member
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Location:Maryland
Gender:Male

Posted August 16, 2012

Oh, and the drone noise when it goes V4 to V8 cant be heard over the radio. I hear it when the radio is off so it's not very loud.

bdox

Posted August 17, 2012

bdox

Member
- 32
Location:Ontario, Canada
Gender:Male
Drives:2009 Silverado 1500 Z71 GFX

Author

Posted August 17, 2012

Appreciate that info. Honestly, I never pay attention to mileage, so I would have never seen this!

Drove the highway home last night and the exhaust drone definitely coincides with the switch from V4 to V8, and V4 has a totally different tone to the exhaust.

jdubub

Posted August 17, 2012

jdubub

Member
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Name:Josh
Location:Dallas TX/ Houston TX
Gender:Male
Drives:2010 Chevy Z71

Posted August 17, 2012

Best bet would be to turn the AFM off.

bdox

Posted August 17, 2012

bdox

Member
- 32
Location:Ontario, Canada
Gender:Male
Drives:2009 Silverado 1500 Z71 GFX

Author

Posted August 17, 2012

I would love to, but $550 seems like a lot of money for what you get...

6Sixathome

Posted August 19, 2012

6Sixathome

Member
- 483
Name:Dave
Location:N. Indiana
Gender:Male
Drives:08 Sierra 1500 Crew Z71

Posted August 19, 2012

I would love to, but $550 seems like a lot of money for what you get...

Not really, you get to keep the AutoCal and you get a tune custom tailored to your wants, not a canned tune. My truck feels totally different from stock, I could tell the first 500 feet that I drove it after the BBPTune. I asked to have the AFM off and the engine and trans cleaned and you can tell. The throttle and trans is right there when needed and no annoying V8/V4 kicking in and out. IMO get a BBP tune and don't look back!

Coolmaker

Posted August 20, 2012

Coolmaker

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- 240
Name:Coolmaker
Location:Beaufort, SC
Gender:Male
Drives:2012 Sierra Slt Ext NHT

Posted August 20, 2012

I would love to, but $550 seems like a lot of money for what you get...

It will be the best money you ever spent..... ;)

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