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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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#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.
#96 of 106 Re: windshield tick,afm lunge [rednecktroy] by bspinz9 May 27, 2009 (8:43 am)
Replying to: rednecktroy (Dec 09, 2008 7:45 am) O YES I GOT 08 5.3L SILVERADO & I CANT STAND THAT NOISE IM BLARING THE RADIO NOT TO HEAR IT & IVE BEEN BACK & FORTH TO THE DEALER & TRYING TO FIND THE PROBLEM IS GONNA BE A WILD GOOSE CHASE HAS ANY ONE FOUND THE PROBLEM Replies to this message: rednecktroy (May 28, 2009 2:01 pm)
#97 of 106 tranny/ afm by bspinz9 May 27, 2009 (10:04 am)
hey guys i got a 08 silverado crew 5.3L Z71 ltz w/ 10k on it & im just wondering if anyone is having this same problem when putting the vehicle in reverse (from drive only) there is a significant 3-5 sec. delay basically leaving me stranded in the middle of the road on a 3 pointer i've been to the dealer they updated the flashdrives for motor & tranny etc.. & still does the same thing & as usual its within the GM tolerance haha. tranny fluid levels are normal & i was just thinking if & i know this sounds out of this world ridiculous the afm has anything to do with it i wanna shut the afm off i think it just effects the total performance of the motor. I've been a long time gm owner & the 04' 5.3L is a monster thats why i stuck with the 5.3 & besides that ticking noise after 60mph the truck is a great truck   oh 1 more thing can the afm be shut off by a tuner & is the hypertech tuner worth it thanks in advance guys   "i just think afm shouldn't be a option when buying a truck a truck is a truck for power & balls fuel management is for the 4bangers & buy american we gotta keep this country alive & trucks is the reason why " Replies to this message: obyone (May 28, 2009 2:57 am)
#98 of 106 Re: tranny/ afm [bspinz9] by obyone May 28, 2009 (2:57 am)
Replying to: bspinz9 (May 27, 2009 10:04 am) Save your money with the Hypertech. There are better tuners out there for the same price.
#99 of 106 Re: Rough Idle w/5.3 AFM [hunter9296] by dyma82 May 28, 2009 (5:01 am)
Replying to: hunter9296 (Dec 18, 2008 2:34 pm) Hi hunter9296, have you find anything new about this condition?   I am having exactly the same issue with my 2007 Silverado 5.3 (Not Flex-Fuel).   Thanks for your time. Replies to this message: rednecktroy (May 28, 2009 2:32 pm) dyma82 (May 28, 2009 7:17 pm)
#100 of 106 Re: windshield tick,afm lunge [bspinz9] by rednecktroy May 28, 2009 (2:01 pm)
Replying to: bspinz9 (May 27, 2009 8:43 am) Have the inside windshield piller trim replaced,The tck will go away for a while.It'l come back after a while.There should be tec service bulletine for this problem.

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