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Old    Charles (chas)      Join Date: Feb 2002       10-25-2010, 10:19 PM Reply   
Any one have a new GM truck with Active Fuel Management? can you feel it kick in and out?
Tossing the idea around about getting a new truck.
Old    Adam Curtis (acurtis_ttu)      Join Date: May 2004       10-26-2010, 6:11 AM Reply   
If your referiing to where the engine switches between 4/8 cylinders automatically, ( like on my tahoe) No you can't feel it at all, only way you can tell is the dash computer.
Old    David (detonate69)      Join Date: Apr 2001       10-26-2010, 1:05 PM Reply   
I have it on my 2008 silverado. you can't tell at all when it switches. very smooth.
Old    Charles (chas)      Join Date: Feb 2002       10-26-2010, 4:30 PM Reply   
Thanks guys,
Going to look at a couple newer trucks this coming week. See how it all pans out.

Still up in the air with what to do with my Tahoe. Hate to sell it but I need a truck.
Old    Nick B (iridelow1998)      Join Date: Jun 2006       10-26-2010, 6:30 PM Reply   
You will know when it kicks down to 4 only because 4 cylinders is quieter than 8. When you're crusing on the freeway you will notice but only at first when you're looking for it to happen. 09 Silverado
Old    Charles (chas)      Join Date: Feb 2002       10-27-2010, 9:44 AM Reply   
I don't know how often it will be kicking down to four cylinders as I am going to lift it on 35's
Old    Matt (pierce_bronkite)      Join Date: Jul 2003       10-27-2010, 9:51 AM Reply   
It seems that it only goes down on 4 cylinders when you're gas is off the pedal, which isnt very much. I have an 08 silverado.
Old    Nick B (iridelow1998)      Join Date: Jun 2006       10-27-2010, 7:01 PM Reply   
Charles- You just changed the entire way to look at things. When you lift it on 35's you will NEVER kick down to 4 cylinders again unless you reprogram the computer to adjust for the new tire diameter. The truck will never think you're at cruising speed to shut down to 4 since your wheels are going to be bigger. I put bigger wheels on my truck also and it hasn't kicked down to 4 once since doing that.

Matt- I think it's more for your cruise control type situations. Mine would kick back up to 8 whenever you gave it more gas on the freeway but if you put cruise control on at 70mph it will kick down and stay there.
Old     (Thrall)      Join Date: Oct 2010       10-28-2010, 11:01 AM Reply   
Don't bother finding one with active fuel mgmt if you're putting big tires on in. Waste of money, find a low mile one without that "option."
Old    Charles (chas)      Join Date: Feb 2002       10-28-2010, 2:01 PM Reply   
I was looking for one with the 6.2 but have not came across any with low miles and a fair price. Not really worried about getting great MPG as my Tahoe is a pig now. Just wanting a truck again. Love the Tahoe, just want to able to toss whatever in back. also makes it nice during deer season. No need for a trailer.

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