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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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#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.
#101 of 106 Re: Rough Idle w/5.3 AFM [dyma82] by rednecktroy May 28, 2009 (2:32 pm)
Replying to: dyma82 (May 28, 2009 5:01 am) Soft lifters and valve springs is where the rough idle problem is,I bought a stethascope to find that there was a faint tick on my right bank,cold starts the tick or miss is more audible hold the peddle to the floor it gets louder.Then take it to your highly educated mechanic,let him tell you its piston slap knock,argue with him till he actually goes out to hear the problem.It took me 45 minutes to get my point across.The lunge problem is when the computor is in relearn mode it has a glich,for sure. Replies to this message: dyma82 (May 28, 2009 7:17 pm)
#102 of 106 Re: Rough Idle w/5.3 AFM [rednecktroy] by dyma82 May 28, 2009 (7:17 pm)
Replying to: rednecktroy (May 28, 2009 2:32 pm) rednecktroy: I agree. Soft lifters could actually explain this problem (shaky idle), and reinforcing the theory is the fact that additionally to the shaky idle, my truck has always been affected by another issue, which is definitely caused by soft lifters (since it was 54 miles old). The other issue being: If I left my truck unused for more than two days, when I start it on the morning of the third day the engine sounds like a very bad diesel. Then little by little the lifters recharge and the sound goes away. It does it 3 times out 5 times I leave it unused for more than two days.   I am trying to gather as much info as possible about this issue, its cause, and the solution, so that by the time I take it to the dealer I can “try” to get something useful out of them.
#103 of 106 2008 Silverado 5.3 with AFM, and cooling problems by owns5chevys Jul 08, 2009 (6:57 pm)
My 5.3 ltr 2008 Silverado runs great, but just doesn't cool effectively. The AFM seems smooth to me, and it makes good power for a 5.3 ltr engine. But long grades on the Freeway cause the temp to keep rising. I have to turn on the heater full blast, and slow down, to keep the gauge from continuing on up. I have had a few puzzling electrical problems, including stabilitrac system errors that are intermittent - wondering if the computer controls the electric fans ? and maybe that is the common root cause of my problem ? But the AFM works good - just not good gas mileage (around 12.6 to 13.2 mpg). Any hints from anyone ? Anyone else have cooling issues and low mileage ? (I have about 8000 miles on the truck now) Replies to this message: littlemac (Jul 27, 2009 4:46 pm)
#104 of 106 Re: 2008 Silverado 5.3 with AFM, and cooling problems [owns5chevys] by littlemac Jul 27, 2009 (4:46 pm)
Replying to: owns5chevys (Jul 08, 2009 6:57 pm) dont know if you solved your problem or not but i had a similar problem with my 01 and it turned out to be the fan clutch. very easy to replace.
#105 of 106 afm by eric_rev1 Aug 31, 2009 (4:00 pm)
does anyone know if there is a way to disconnect the afm? I have 50,000 miles on my 07 with a 5.3ltr and have never gotten above 17 mpg. i got that in my 01 with a 5.3. id just as soon not have it if its not gonna help. at least i wouldnt have to listen to my exhaust go from a deep v8 growl to a 5 hp briggs and stratton.

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