- #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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- #58 of 106
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Re: 2007/2008 Sierra Active Fuel Management Problems [johnnyell]
by obyone
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Jul 29, 2008 (8:24 pm)
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Chinese multilevel marketing? Give me a break. Spam by any other name is still SPAM!!
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- #60 of 106
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valve lifter noise
by astroman2
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Jul 31, 2008 (3:08 pm)
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I have a new 2008 Sierra with 5.3l engine and about 2,000 miles. Once every week or two, when starting the engine, it sounds like none of the lifters have oil in them. The engine sounds like an old model V8 with mechanical valve lifters that are way out of adjustment.
The valve clatter will continue but goes away by shutting off the engine and Immediately starting it again. The oil pressure is good and the dip stick shows oil is full.
The noise only happens when the engine is cold or warm. Is AFM in control of the lifters and valves at startup?
Has anyone had this problem?
Thanks,
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- #61 of 106
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Re: valve lifter noise [astroman2]
by natesms
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Jul 31, 2008 (6:18 pm)
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Replying to: astroman2 (Jul 31, 2008 3:08 pm)
I have the 6.0 in my Silverado and I have noticed that to, but very breifly on start up. It sounds exactly like you describe but goes away in a couple of seconds. I don't have to shut it off and back on.
Let us know if you find out anything.
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- #62 of 106
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Re: valve lifter noise [astroman2]
by obyone
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Jul 31, 2008 (8:34 pm)
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Replying to: astroman2 (Jul 31, 2008 3:08 pm)
The dealer will tell you that this is normal and happens more often with the 6.0 for some reason. For myself, it would disturb me. But what can you do?
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