- #48 of 106
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Re: Active Fuel Management [mattbarry6]
by branhap
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May 29, 2008 (8:19 am)
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Replying to: mattbarry6 (May 29, 2008 6:09 am)
A few people with custom tuners or a custom tune have disabled AFM. Most people though with an active tune interested in improving MG make it more aggressive. Stock, AFM kicks on when throttle is less then 6%. A lot of people have bumped it up to 10% of throttle and had a noticeable change.
AFM always turns off the same valves though. It doesn't alternate. It also turns itself off after 5 minutes of continuous use to prevent the active cylinders from overheating to much.
In any case, this is my reading forums only. My 5.3L AFM is bone stock.
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- #49 of 106
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Re: Active Fuel Management [branhap]
by rednecktroy
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May 30, 2008 (4:28 am)
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Replying to: branhap (May 29, 2008 8:19 am)
Is there anyone with the programmer in central Ohio? thanks Troy.
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- #50 of 106
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Re: Active Fuel Management [rednecktroy]
by branhap
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May 30, 2008 (9:26 am)
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Replying to: rednecktroy (May 30, 2008 4:28 am)
I dunno. I've lived in Wyoming the past few years. Haven't lived in Ohio since 2001.
As for tunes, the most popular one I read about is black bear tune. He basically sends you some equipment to plug into your truck, then you send him back the info tell him what ya want and voila. gm-trucks.com seems to have the most info on tuners.
Good luck!
Paul
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- #51 of 106
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Re: Maybe this thread is the one I should have posted this in. [doc_holiday
by putterca
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Jun 05, 2008 (6:46 pm)
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Replying to: doc_holiday (Feb 28, 2008 8:51 pm)
you can add the DIC buttons yourself for under $60 and about 5 minutes of your time. all you need to do is order the switches and the replacement dash panel that accomodates the DIC controls. the harness to plug the switches in is already installed and just sitting behind your current dash waiting for you to plug into.
I had the same frustrations as you and learned that this could be done very easily.
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- #52 of 106
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6 speed
by putterca
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Jun 05, 2008 (6:50 pm)
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don't expect the 6 sped tranny to drastically improve fuel mileage. from my understanding, the design is more to smooth out the shifting through the gears, not necessarily to add a high end gear.
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- #53 of 106
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'06 Silverado Crew Cab
by bprepdah
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Jun 29, 2008 (7:34 am)
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Can anyone tell me where the EVAP canister is located on an '06 Silverado Crew Cab?
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- #54 of 106
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Re: 2007/2008 Sierra Active Fuel Management Problems [gmax6]
by chevyfan1969
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Jul 28, 2008 (9:05 pm)
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Replying to: gmax6 (Apr 23, 2008 5:39 pm)
Really good post Gmax. After much debate, I just purchased a 2008 1500 Vmax. I was originally planning on buying a diesel, either a Dodge or Chevy, but after thinking about it I backed out of a diesel altogether. I just couldn't make the initial cost ($6500 extra) plus the premium on fuel work out on paper. I can buy ALOT of gas for that amount. Sure, I've heard alot of people tell me that a diesel will work alot longer, but I don't plan on keeping it for 500,000 miles anyway. Anyway, I've put about 700 miles on it so far and am very happy with it. I've read several complaints about fuel mileage, excessive shifting, stutter when going in & out of AFM, and rough idle. First, my mileage sets at around 18 mpg on average which I think is great for a truck that has the capabilities that this one does. If you want fuel mileage, buy a 4 cylinder. There's always trade-offs when it comes to power/ mileage. I thing GM has done a good job at coaxing 18 or so out of it. I was really expecting closer to 13-14. I do have the excessive up/ down shifting when climbing a pretty good hill but I've noticed that the reason that it does that is, when it downshifts, it has enough torque to quickly get it back up to speed, causing it to shift back up. I would suggest if that is a problem, drop the shifter down to 3rd to eliminate the "problem". As far as noticing it going in and out of AFM, it's very slight. The only reason I notice it is because it's a new feeling that I'm not accustomed to yet. The idle is defininately a little rough, but I think it's cool. All ponied up engines have a rough idle that I've been behind. All in all, I think it's a great truck and I can't wait to hook on to my trailer and see what it'll do. Anyway, just wanted to ad to your post.
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- #55 of 106
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AFM question
by jboehm
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Jul 29, 2008 (12:50 pm)
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I have driven a couple of different Silverado/Sierras with the Acitve Fuel Management. One thing I have noticed is that, when sitting at a stop light, the AFM will switch from 4-cyl to 8-cyl. Can someone explain why? (I know that I have seen documentation that that is the way it is suppose to work but I cannot locate a reason why).
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- #56 of 106
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Re: AFM question [jboehm]
by tafid
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Jul 29, 2008 (3:55 pm)
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Replying to: jboehm (Jul 29, 2008 12:50 pm)
I have the same problem. I notice that the rpm increases as well. If I stop, open the garage door, ease off the brake, occasionally the truck will surge up to 900-1000 rpm. Chevy tech service says it is normal, but did not explain why.
How can it be normal to have your foot on the brake and the vehicle rpm increase and vehicle surge forward?
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