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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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What is this discussion about? GMC Sierra 1500, Chevrolet Silverado 1500, Fuel System, Truck

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#75 of 106 Re: problems with a 2008 gmc sierra 5.3 [obyone] by jess20 Dec 09, 2008 (4:43 pm)
Replying to: obyone (Dec 08, 2008 3:14 pm) gm said its normal its when it switches from 4 to 8, they are say its the change in exhaust tone, its driving me crazy.
#76 of 106 Re: problems with a 2008 gmc sierra 5.3 [jess20] by Beefnutz Dec 09, 2008 (5:45 pm)
Replying to: jess20 (Dec 08, 2008 3:09 pm) well im glad im not the only one, i have an 08 sierra as well and i really didn't notice it until i drove it on a long trip, mostly on the highway is when you notice it, it seems like it does it once you maintain your speed for a little while, your driving and then all of a sudden you hear the vibration and im guessing that means that its in 4 cylinder mode, i HATE it as well it drive me insane. a friend of mine had his turned off and im probably going to do the same i bought a V-8 for 8 cylinders not 4 and to be honest with ya i think it is harder on the engine switching all the time. other than that i love the truck though....lots of space and lots of power(in 8 cylinder mode that is) Replies to this message: jess20 (Dec 11, 2008 1:39 pm) Beefnutz (Dec 15, 2008 5:17 pm) santaman58 (Jan 05, 2009 5:51 pm)
#77 of 106 Re: problems with a 2008 gmc sierra 5.3 [Beefnutz] by jess20 Dec 11, 2008 (1:39 pm)
Replying to: Beefnutz (Dec 09, 2008 5:45 pm) hey can u do me a big favor and find out how d they turn that feture off. I whant to turn it off Replies to this message: Beefnutz (Dec 15, 2008 5:17 pm) santaman58 (Jan 05, 2009 5:51 pm)
#78 of 106 Re: problems with a 2008 gmc sierra 5.3 [jess20] by Beefnutz Dec 15, 2008 (5:17 pm)
Replying to: jess20 (Dec 11, 2008 1:39 pm) yeah the thing my buddy failed to mention was that he got his AFM turned off in Florida somwhere...so if you are near then then i can find out more details.........im in north carolina so that won't work for me.....i need to get that junk turned off cuz i can't stand it.....especially when im towing my boat....even in tow haul mode the truck doesn't no theres a big ass boat behind it.....im trying to read up on it as much as possible to find someone local who can do it.....maybe GM can do it prob not though im sure theres some loop hold that will void your warrenty......that being said if you find somewhere that does it let me know...and i will do the same for you
#79 of 106 Re: Maybe this thread is the one I should have posted this in. [mikef15] by skimm99 Dec 15, 2008 (7:47 pm)
Replying to: mikef15 (Dec 08, 2008 4:47 pm) I got my 08 LT in January and it does have DIC. It is on the left side above the headlight switch.
#80 of 106 Rough Idle w/5.3 AFM by hunter9296 Dec 18, 2008 (2:34 pm)
I am wondering if anyone has a rough idle problem with the 5.3 w/AFM? I have seen several posts here with complaints about the 6.0 having a rough idle, but none really on the 5.3. I have a 2008 GMC Sierra that has a distinct shaky idle. The RPM needle does go up and down at times. I thought it was because the engine was just in the break in period, but I now have almost 3,000 miles on it and it hasn't improved. I don't know if it has to do with the AFM or possibly something else. My engine is the FlexFuel version, but it has this problem on gas or E85. It really gets annoying at stop lights. It gets worse the longer I idle. I'm beginning to wonder if I have an old carberated engine under the hood!!! Anyone else having this problem or heard of others having this problem? Replies to this message: 09sierraz71 (Mar 22, 2009 6:27 pm) dyma82 (May 14, 2009 5:25 am) wildcat82 (May 14, 2009 5:38 am) dyma82 (May 14, 2009 7:43 am) and 1 more... dyma82 (May 28, 2009 5:01 am) rednecktroy (May 28, 2009 2:32 pm) dyma82 (May 28, 2009 7:17 pm)
#81 of 106 Re: windshield tick,afm lunge [rednecktroy] by toywrench Dec 29, 2008 (5:24 pm)
Replying to: rednecktroy (Dec 09, 2008 7:45 am) usually the tick comes from the flaps on the sides of the w-shield   i fix them by squirting sealant under the flaps and letting it dry   it is easy to make a mess but easy to clean up when dry
#82 of 106 fuel economy by urias Jan 04, 2009 (9:05 pm)
I have a 2008 silverado 2500hd 4X4, reg cab, eight foot box, 6 litre motor, 6 speed auto transmission with 3:73 gears...how are you guys doing for fuel economy...I am getting 13-14 city and 18 highway...what can improve this...have 17,000km on it
#83 of 106 Re: problems with a 2008 gmc sierra 5.3 [jess20] by santaman58 Jan 05, 2009 (5:51 pm)
Replying to: jess20 (Dec 11, 2008 1:39 pm) Hello. I bought the Diablosport Predator tuner and turned the AFM(DoD another name for AFM). Only tuner I know of that turns it off. Money well spent!!!!!!
#84 of 106 afc and top speed by powdercoater3 Jan 21, 2009 (7:28 pm)
have a 2007 sierra top speed 89 mph . smooth eng, no codes just won't go any faster than 89 mph. standed factory equip. Replies to this message: santaman58 (Jan 29, 2009 5:39 pm) powdercoater3 (Jan 30, 2009 7:46 pm)

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