Active Fuel Management

[Jason in DLH]

Apparently my engine has AFM. It’s a 2007 Yukon Denali with the L96 6.2 L. I remember my 2005 5.7L Ram had it and when I removed the muffler I heard it go in and out of V4 mode (drove me crazy). I have even a louder exhaust on the Yukon, but don’t notice any AFM at all. Do these engines have AFM or not?

 

[intheburbs]

Unless your engine was replaced, you don't have an L96. L96 was used in the SUVs starting in 2010.

Assuming you have the original factory engine, it's the L92 and does NOT have AFM.

 

[wjburken]

Apparently my engine has AFM. It’s a 2007 Yukon Denali with the L96 6.2 L. I remember my 2005 5.7L Ram had it and when I removed the muffler I heard it go in and out of V4 mode (drove me crazy). I have even a louder exhaust on the Yukon, but don’t notice any AFM at all. Do these engines have AFM or not?

As @intheburbs stated, your 2007 Denali 6.2 does not have AFM. Neither did the 2008’s.

What is making you think you have AFM?

 

[Jason in DLH]

Oops...my mistake...double checked the RPO and I’ve got the L92. Ive got a ‘15 Yukon too and I get confused sometimes.

I don’t know where I read that I have AFM, but saw it somewhere. Oh well...I don’t want AFM, so no need to deactivate for me. Good news! Maybe I’m thinking of the ‘15 again. Haha!

Well..sorry to waste everyone’s time!

 

[iamdub]

No AFM in the L92 but you do have VVT, and that's a good thing.

 

[Jason in DLH]

I was aware of the VVT as I’m looking into swapping out the cam. I might delete the VVT to go with a better cam, but still need some more research on the issue.

 

[InTNallen]

Oops...my mistake...double checked the RPO and I’ve got the L92. Ive got a ‘15 Yukon too and I get confused sometimes.

I don’t know where I read that I have AFM, but saw it somewhere. Oh well...I don’t want AFM, so no need to deactivate for me. Good news! Maybe I’m thinking of the ‘15 again. Haha!

Well..sorry to waste everyone’s time!

View attachment 261348

Where is this RPO sticker?

 

[wjburken]

Where is this RPO sticker?

Inside your glove box.

Looks like this:

 

[rdhogg]

Where is this RPO sticker?

The sticker is inside the glove box door

 

[91RS]

I was aware of the VVT as I’m looking into swapping out the cam. I might delete the VVT to go with a better cam, but still need some more research on the issue.

"Better" is a matter of opinion and personal preference. The VVT is awesome. You can get all kinds of power down low and the same top end power from a smaller cam as a bigger cam but without all the draw backs and having to get a high stall torque converter. Many tuners are scared of VVT because they don't know how to tune it and steer people away from it. As long as you have a good tuner you will be much happier keeping the VVT. Unless you're trying to build a drag strip queen in which case this isn't the best vehicle to start with.

 

[iamdub]

"Better" is a matter of opinion and personal preference. The VVT is awesome. You can get all kinds of power down low and the same top end power from a smaller cam as a bigger cam but without all the draw backs and having to get a high stall torque converter. Many tuners are scared of VVT because they don't know how to tune it and steer people away from it. As long as you have a good tuner you will be much happier keeping the VVT. Unless you're trying to build a drag strip queen in which case this isn't the best vehicle to start with.

 

[Jason in DLH]

Sorry...I chose the wrong words..I should have said more aggressive cam. I don’t know if I’ll get around doing this though as I’m getting an itch to finally sell it.

 

[HD_LS]

Apparently my engine has AFM. It’s a 2007 Yukon Denali with the L96 6.2 L. I remember my 2005 5.7L Ram had it and when I removed the muffler I heard it go in and out of V4 mode (drove me crazy). I have even a louder exhaust on the Yukon, but don’t notice any AFM at all. Do these engines have AFM or not?

You need to be careful here. The replys that you received that say your L92 engine does not have AFM are not strictly true. If your 2007 Denali was built prior to April 1, 2006 (and a lot of them were), you engine has all the AFM hardware inside (even though AFM operation is not commanded in the ecm software).

Here are a few references to the L92s having AFM prior to April 1, 2006 build dates, including an August 2020 GM TSB.

https://static.nhtsa.gov/odi/tsbs/2020/MC-10180695-9999.pdf

https://www.onallcylinders.com/2018...ormance-bore-stroke-cylinder-heads-cam-specs/

https://en.wikipedia.org/wiki/General_Motors_LS-based_small-block_engine

 

[Jason in DLH]

Interesting...Thanks for the info!