Afm Engages Twice As Often As Before Wtf?

bizzle · March 10, 2009

ok long story short i hear the way my truck sounds every single night the whole way home.....there are no variables same route and speed every night....well tonight my AFM was kicking on way more often and it was switching on and off at like 20 mph constantly same thing at 35....seriously WTF???/anyone else have this prob......im turning this shit off.....i just wish GM could do it cuz i don't have the cash for a custom tune at the moment.....i know this topic is ongoing and stuff but any help would be great thanx

matt3 · March 10, 2009

Warmer temps could be affecting it. How long have you owned the truck?

bizzle · March 10, 2009

ive had it for about 5 months and i bought it usecd with about 20k

gvbhunt · March 11, 2009

Check to see if you have a vaccuum leak. One of the variables that tell it when to turn on and off is vaccuum.

ajswenson · March 11, 2009

Could it be the wind?

Dexgto · March 11, 2009

So what are you bitching about? Is it causing driveability problems? Quit watching the DIC.

Fyrcaptain · March 11, 2009

Dealer service latey.......wasn't there a PCM flash update that lowered when the AFM cuts in?

Sir Dan · March 12, 2009

Did you have the Tow/haul mode engaged by chance? I've found that with the tranny in this mode, the AFM is much more active at lower speeds especially just under 50 mph before the OD kicks in. I have a Predator tuner and have turned off the AFM (DoD). I do experience slightly lower fuel mileage in city, but the truck is so much more responsive. AFM is not a good thing on these trucks IMHO, but there are many heated debates about this topic.

LS4U2NV · March 12, 2009

Ok. I didn't know what AFM was. Till I seen DoD.

Guess my question is. What does AFM stand for?

I haven't a clue.....

VMax2007 · March 12, 2009

Ok. I didn't know what AFM was. Till I seen DoD.
Guess my question is. What does AFM stand for?

I haven't a clue.....

A F*cking Mess.

or

Active Fuel Management.

bizzle · March 19, 2009

So what are you bitching about? Is it causing driveability problems? Quit watching the DIC.

my truck didn't come with all that fancy shit.....when i bought it the dealer tried to tell me that it didn't have afm because it doesn't show on the dic console....so it is impossible for me to watch the DIC. i can only hear it going on and off and with flowmaster super 44s you would have to be def not to hear it

bizzle · March 19, 2009

Did you have the Tow/haul mode engaged by chance? I've found that with the tranny in this mode, the AFM is much more active at lower speeds especially just under 50 mph before the OD kicks in. I have a Predator tuner and have turned off the AFM (DoD). I do experience slightly lower fuel mileage in city, but the truck is so much more responsive. AFM is not a good thing on these trucks IMHO, but there are many heated debates about this topic.

no tow haul was not on....i hate afm as well i bought a v-8 for a reason and i honestly don't think it saves you that much gas....IMO it would seem like more work for the engine to keep switching back and forth but thats just my opinion.....im thinking it might have something to do with the temperature

Z71Adrenaline · March 20, 2009

...and i honestly don't think it saves you that much gas...

I don't know about this. I don't want to start the whole argument about AFM again, but my 2008 gets a consistent 6-8 mpg more than my 2001 of the exact same configuration did. I know these trucks aren't that much more aerodynamic.. I'm sure it is a combination of factors, but I don't have a problem with AFM at all..

VMax2007 · March 20, 2009

...and i honestly don't think it saves you that much gas...

I don't know about this. I don't want to start the whole argument about AFM again, but my 2008 gets a consistent 6-8 mpg more than my 2001 of the exact same configuration did. I know these trucks aren't that much more aerodynamic.. I'm sure it is a combination of factors, but I don't have a problem with AFM at all..

6-8 Huh? Hmmm, does that mean my truck would be getting 6-7 MPG without AFM?

AFM is worthless.....unless you consider .5 MPG worthwhile..and I am being optimistic.

Mine is getting shut off within the month. I will bet my mileage does not drop noticeably at all.

txab · March 20, 2009

...and i honestly don't think it saves you that much gas...

I don't know about this. I don't want to start the whole argument about AFM again, but my 2008 gets a consistent 6-8 mpg more than my 2001 of the exact same configuration did. I know these trucks aren't that much more aerodynamic.. I'm sure it is a combination of factors, but I don't have a problem with AFM at all..

It's a combination of factors...........