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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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#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.
#90 of 106 AFM in a 2007 GMC Sierra work truck by brucesac Apr 18, 2009 (3:16 am)
Hello all. Here is my quick question. Just purchasing the above mentioned vehicle and getting pretty poor mileage, I'm just trying to find out how I know if the AFM is even working. I read the posts about adding the Driver's Information Center but my dashboard doesn't even have the spot on the left hand side like people are saying. Anyway, since this is the "low end" work truck without the bells and whistles, I don't know how to determine if the AFM is working on this 5.3L engine. I can't feel any difference in the engine and we just took it on a long trip and averaged about 16 MPG using cruise control the entire way. Any help and/or suggestions would be appreciated.
#91 of 106 AFM problem gets worse by wildcat82 Apr 28, 2009 (12:24 pm)
I have the AFM in my 2005 TB EXT and it's been giving me problems since I hit 60,000 miles. It fouls out the plugs in cyl. 1,7,4,6 every 5000 miles or so and creates a plume of blueish smoke only when cruising down the highway and it kicks in from 4 to 8 cyl. No smoke any other times than that. i now have 150,000 miles mostly from the highway.
#92 of 106 Re: Rough Idle w/5.3 AFM [hunter9296] by dyma82 May 14, 2009 (5:25 am)
Replying to: hunter9296 (Dec 18, 2008 2:34 pm) I am having EXACTLY the same problem on my Silverado 2007 5.3. Mine is not flex-fuel...gas only. I know mine has the AFM because I can see it switching from V-8 to V-4 and back while driving on the highway.   Have you figure it out?   I want to take it to the dealer, but I would like to learn a little more about this issue before. I don't trust dealer's tech personnel. I have had very bad experiences with them, leaving me with the feeling that they don't really know their own product very well. Thus, I try to avoid trips to the dealer as much as possible. Replies to this message: wildcat82 (May 14, 2009 5:38 am) dyma82 (May 14, 2009 7:43 am) wildcat82 (May 14, 2009 8:03 am)
#93 of 106 Re: Rough Idle w/5.3 AFM [dyma82] by wildcat82 May 14, 2009 (5:38 am)
Replying to: dyma82 (May 14, 2009 5:25 am) I haven't figured it out yet. I have a mechanic doing a search for me to see if there is a way to disable the AFM. Mine is not flex-fuel either....I'm thinking that the solenoids that control the locking pins are not operating properly and allowing oil to leak into the cylinders in shutdown mode. Must be a way to shut it off through the computer. Replies to this message: dyma82 (May 14, 2009 7:43 am) wildcat82 (May 14, 2009 8:03 am)
#94 of 106 Re: Rough Idle w/5.3 AFM [wildcat82] by dyma82 May 14, 2009 (7:43 am)
Replying to: wildcat82 (May 14, 2009 5:38 am) I get the feeling that the AFM is not the source of this problem (Rough Idle...I mean, it is a very gentle shaking while idling. However, even though it is very subtle, it is very, very annoying and unexpected on a 34K truck). Replies to this message: wildcat82 (May 14, 2009 8:03 am)
#95 of 106 Re: Rough Idle w/5.3 AFM [dyma82] by wildcat82 May 14, 2009 (8:03 am)
Replying to: dyma82 (May 14, 2009 7:43 am) Mine isn't a rough idle problem; just a plume of smoke that only happens when cruising on the highway and I start to accelerate. Like I said before, I get no smoke any other times and the only plugs that foul are cylinders 1,7,4,and 6 which are the ones that shut down during AFM.

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