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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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#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)
#85 of 106 Re: afc and top speed [powdercoater3] by santaman58 Jan 29, 2009 (5:39 pm)
Replying to: powdercoater3 (Jan 21, 2009 7:28 pm) Hey. Wasn't sure if you were asking or responding to post...but if you are asking then the new Silverados have speed limiters on them. You'll have to get a programmer to turn it off. Just in case you were asking.... Replies to this message: powdercoater3 (Jan 30, 2009 7:46 pm)
#86 of 106 Re: afc and top speed [santaman58] by powdercoater3 Jan 30, 2009 (7:46 pm)
Replying to: santaman58 (Jan 29, 2009 5:39 pm) it was a post dealers say they don't know anything about it but there must be a limit on the max speed (89) do you know of a programmer that will do the job
#87 of 106 RE: Poorly performing defroster on my 2008 sierra 1500 by jason5817 Feb 11, 2009 (1:37 pm)
The defroster on my 2008 sierra 1500 has too small of a vent to properly heat the windshield. Anyone else have this problem?
#88 of 106 Re: Rough Idle w/5.3 AFM [hunter9296] by 09sierraz71 Mar 22, 2009 (6:27 pm)
Replying to: hunter9296 (Dec 18, 2008 2:34 pm) I just bought a 2009 Sierra with the 5.3 and FlexFuel and I'm having the same exact problem...there is a 200 RPM range difference at idle i went back and they re flashed the idle sensor and computer and it didn't help now it has to go back for a whole new throttle body. Its been doing it since brand new and i now have 1100 miles and its still doing it....It sucks because i want to put dual exhaust on it but it would sound stupid....GM really needs to step up there game here...ive been a loyal gm owner since i was 16 and this really left a sour taste in my mouth....$36K for junk.
#89 of 106 Engine vibration on the 5.3 by jacmyoung2 Mar 27, 2009 (5:12 pm)
My first Silverado was a 2000 4.8, did not have any vibration issue, upgraded it to a 2004 5.3 Silverado, in 2007 started to develop vibration on idle and at about 65MPH on the freeway. Took it to the dealer three times spent about $250 to replace varous parts, no cure.   At the end of 2008 received a court ordered notice from GM regarding a class action settlement on the engine vibration complaint for 1995-2003 all Silverado V8 models.   Recently traded in my 04 5.3 in for an 09 4.8, decided to stay away from the 5.3 for now until they figure out the issue.

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