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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: 1offroader (Jan 31, 2008 8:35 pm) |
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Replying to: 1offroader (Jan 31, 2008 8:35 pm) |
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Replying to: natesms (Feb 01, 2008 8:30 am) I do feel that GM has misrepresented the milage some though, seeing that even on my best driving behavior I can't get the stickered milage in either the city or the highway. I'll be taking it in this week to get it looked at though. As others have stated in prior posts, it feels like the motor is tugging going up hills and the transmission seems to hunt for gears to often. I've got 1300 miles on it now. If it can't figure out when it should shift in 1300 miles, then something is wrong. I'll be interested to see if I get the "It could take up to 7,000 miles" line that someone else received.
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1offroader Yes, I was told the sudden engine speed increase while coming to a stop was normal, but I (for one) did not believe it. I even tried going through BBB Autoline, no good. I will be going back to the dealer. This time I will explain the problem differently. While easing into a parking spot, using only the brake, the rpm increases. At that point the AFM should not be switching from 4 to 8 or 8 nor 4, I would not think. This is the reason given as to why the rpm increases while coming to a stop. But after stopping, raising my garage door, and rolling into the garage the rpm will increase. You are right, I must put more pressure on the dealer. tafid |
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Replying to: natesms (Feb 04, 2008 8:46 am) I do notice that if I drive regularly above 70, the AFM does not kick in as much, and it seems to stay off if I am pushing 80...which is normally too fast for me. So far my truck has proven to be world-class in every way. If I could have waited another 9 months I would have ordered with the soon to be released 6 speed transmission.
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Replying to: fhaines (Feb 10, 2008 6:47 am)
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Replying to: fueledup (Feb 10, 2008 12:28 pm) "Current predictions have EPA estimates hovering around 16 mpg in the city/21 mpg on the highway with the 5.3-liter V-8. Expect that number to improve when the six-speed transmission replaces the four-speed (both column shifters with an improved hand-contoured grip) in the SUVs and pickups in the next model year." I have not see much supporting documentation since. I am attaching the link from which this was quoted, the link is: http://www.motortrend.com/features/112_0609_2007_chevrolet_silverado/options.htm- l I think GM has always intended to use the 6 speed when it becomes available, but the total volume of vehicles (GM builds) that can accommodate the 6 speed is greater than available units, hence the phase in. I doubt you could bank on a firm date for the 6-speed phase in. My truck with the 4-speed has plenty of power and holds its shift points well, even when I am towing. I was very skeptical about buying the truck with the 4-speed, however, this particular unit is one of GM's more robust units. I looked at the Tundra because it had a 6-speed transmission, but felt it was not as good a value, and the fit and finish was better on the Chevy. You will not be disappointed with your LTZ selection as configured, I remain completely impressed with mine at now 15K and counting. I just finished a road trip today, in 4 Auto, in snow, ice and rain, and got 18.2 MPG.
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Replying to: fhaines (Feb 13, 2008 9:13 pm) |
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Well, I have the 5.3 on my "new" chevy 1500 2wd extended cab that is supposed to have the AFM. Ive put 22,000 miles on it since memorial day and have yet to achieve anything better than 18-19 (19 on a good day) MPG. BTW, the sticker said 22 hiway. My question for those who know, is if you have the truck without the DIC buttons, how would you know if AFM is active or not? The book says there is a display regardless of whether you have the DIC buttons or not, but fails to mention how one would know. I drive many days from gas station to gas station only touching the brake pedal and ignition when I leave the first station, stopping at the next one. 60-65 mph, cruise on, all highway. I drove 948 miles this week and might have achieved 18 mpg if I rounded it up. I generally get about 400 - 420 miles per tank and my fill ups are between 22.5 - 24.5 gallons. My simple math tells me that if I were to get even 20mpg, I should go 440 miles on 22 gallons of gas. No, I dont see any indication that AFM even exists. The serial number says it has it, the sticker says it has it, but other than that, there is no indication that it exsists or if it does, that it functions. Ive even driven 2 tank fulls with the trailer button depressed only to find the same exact milage. I love the truck, dont get me wrong. It's not the most comfortable for 6 or 8 straight hours, but it's a truck. My question remains. How would one know when the engine goes to 4 cyl. My next question (assuming there is no way for joe truck owner to know) is how would the dealership test it? Can they hook a computer up to it and see it function, can they engage the EFI manually or however AFM works? How can they show me that it is doing what it says it is or for that matter, even show me that it's installed? 18 is ok? Thats 20% off the sticker. What if your wife was in the grocery store, bought $100 worth of groceries, and the store constantly failed to load more than 80% of those groceries in her trunk? What if you bought an air conditioner rated at 16 SEER only to find out it was a 13 SEER? What if the fuel stations only delivered 80% of the fuel the pump said it did? All I want to know is... Is it there, and if so, does it work (show me). It's a shame a coworker who has the same truck except his is 4wd and he gets over 20 per gallon with the same monthly miles and same type of driving. |
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