Afm not working correctly?

BG1988

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Okay I need a little help figuring out if my afm is working properly. So I've my 2011 yukon going on 6 months, and I've noticed the only time I get the Afm to activate is around 30 to 45 mph and thats I-4 but whenever I'm at highway speeds nothing doesn't activate, Only stays in v8. I thought there was a v6 mode? Is there something wrong or is later years that it happens.

P.s I have a disabler on the way. If it's literally just the I-4
just fyi the range will change the shift points esp for the EVT gear that will change from 40mph to 48mph
 

Amaster

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just fyi the range will change the shift points esp for the EVT gear that will change from 40mph to 48mph
I realized that. But thank you anyhow! If I start realizing troubles, I'll get a tune.
 
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Amaster

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make sure you use 91 or 93 octane fuel 87 damages the engine
Nope why the hell they call it flex fuel then it's just getting regular unleaded if anything I'll remove the disabler if it gives me problems
 

CaptainAmerica1

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No sir, that motor doesn’t like 87. What you save at the pump will cost you in repairs and then some when that motor detonates itself to pieces. E85 is 100+ octane so use that instead.
 

Amaster

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Flex fuel means it can run E85 not any swill you want.
87 is better then 85 meaning it should be fine it's not a classic car it doesn't deserve it or the engine would've been gone a long time ago amen boom
 

BG1988

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No sir, that motor doesn’t like 87. What you save at the pump will cost you in repairs and then some when that motor detonates itself to pieces. E85 is 100+ octane so use that instead.
i was told the 2010+ hybrid plus was not flex fuel unless that guy lied

does the manual say it takes it??
 

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