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Pickups Chevrolet Silverado & GMC Sierra 2007/2008 Silverado and Sierra Active Fuel Management Problems
106 messages, Last post on Sep 01, 2009 at 9:04 PM
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Replying to: canw (Jan 21, 2008 8:28 am) I do not understand where all the lousy mpg is coming from. I get an honest 18 on the fwy. at 70 mph, in cruise control. Maybe that is the key, having it on cruise control. As to the afm, I have had a friend try to tell me when he thinks it goes from v8 to v4 while riding in the passenger seat, he can't do it. I can tell, just barely, if I am driving because I have a foot on the throttle and it is just barely noticeable if I am concentrating on it. Otherwise not. Genuinely sorry for your problems, but do not let the dealer tell you that surging is not a safety issue, it most assuredly is a safety issue. Get it fixed before someone gets hurt. 1offroader
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Replying to: canw (Jan 21, 2008 8:28 am)
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Replying to: 1offroader (Jan 21, 2008 9:32 am) Do you have the 4.10 gears in yours? I know there is a package that has the 6.0 with the 3.73's. The Max package puts in the 4.10's. I turn about 2300 RPM at 70mph. The 5.3 with 3.73s I test drove turned 1900 - 2000 at 70mph. I must say that aside from feeling the AFM kick on and off (my passengers don't notice it like I do, I think it has a lot to do with how closely I am paying attention to everything in my new truck), I really do like driving it around. I think if you want to tow an 8,000 pound boat comfortably you just have to accept paying the price at the pump, or pay the price on the sticker and get the diesel. natesms
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Replying to: ponch1 (Jan 21, 2008 10:07 am) |
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Replying to: 1offroader (Jan 21, 2008 9:32 am) I agree 100%. Don't own a 6L but I do own an '08 5.3L Sierra. Overall city/highway I'm up to 17.2 mpg. To get there I have to liberally use the cruise control. Don't do 70. Tend to set it to 65 and forget it. I even use cruise control around town when I know I'll be able to tool down the road a couple of miles. Even mild acceleration sets it to V8 mode. I find my foot on the petal isn't as efficient as the cruise control going up inclines and maintaining speed. On flats cruise control spends the majority of the time in V4 mode. Naturally, when going down even gentle grades cruise or no cruise you'll get great mpg in V4. I haven't reset the command control to see how much I get just on the highway but looking at the instant fuel economy display I'd estimate 19-21 mpg. The downside is around town going stoplight to stoplight it's hard to get decent gas mileage. I tend to press the petal briefly to maintain speed then drift a bit, etc. But it depends on traffic. |
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Good Lord: all these probs with the afm in these new mod has convinced me jus to put a new block in mine when she's done. I have the 99 new body z\71 4x4 and have loved every minute behind the wheel,with almost 300 thou she has been without a doubt the best truck I have ever owned.3 foot of mud or flat out like a lizzard she performs like a dream,and at a mer $2,3000.yep a new 5.3 block is in my future. 
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Replying to: natesms (Jan 21, 2008 10:27 am) I have the 3.73 gears, and 6.0L. I am not towing a huge trailer or boat and don't need the 4.10s. Yes, the Max Trailering package has the 4.10s. 1offroader |
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Replying to: chainlink (Jan 31, 2008 3:24 pm) Chevy has sold perhaps 100,000 Silverados with AFM and there are what, 27 posts about problems??? And several of those posts have been by the same person. Do you consider that a sign of a major problem? I'm sure you've got a fine truck but I don't think 27 posts is excessive considering the tiny fraction of 1% with problems, do you? If there was a vehicle out there that sold 100,000 units and there were 100 problems (0.1 %) would you not buy it? 1offroader
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Replying to: 1offroader (Jan 31, 2008 8:35 pm) I'm getting used to the AFM "kick" and don't really notice it that much anymore. I'm also averaging 12.5 in the city now, which given rounding and factoring in that is very cold and remote start has made my list of top 5 best things ever, is excatly what the window says. I have a 550 mile trip this weekend. I'll reset the average and let you all know what I get at highway speeds. I don't believe I have the will power to not do at least 5 over the speed limit so I expect it to be pretty crappy at 75 mph. Another question pertaining to fuel mileage. Does anyone know if you get worse milage when you have the 4X4 set to auto (assuming it isn't engaged all the time)? I can hear something moving when you switch it to that mode, so I'm assuming that you are turning more "stuff" and hence decreased milage.
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Replying to: 1offroader (Jan 31, 2008 8:35 pm) |
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