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Pickups Chevrolet Silverado & GMC Sierra 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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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 "
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Replying to: bspinz9 (May 27, 2009 10:04 am) |
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Replying to: hunter9296 (Dec 18, 2008 2:34 pm) I am having exactly the same issue with my 2007 Silverado 5.3 (Not Flex-Fuel). Thanks for your time.
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Replying to: bspinz9 (May 27, 2009 8:43 am) |
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Replying to: dyma82 (May 28, 2009 5:01 am)
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Replying to: rednecktroy (May 28, 2009 2:32 pm) 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. |
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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)
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Replying to: owns5chevys (Jul 08, 2009 6:57 pm) |
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| 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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Yep...No Problem. Said that in the title too. Jeeze...Get used to it cause it IS the future. Mine is a 2009 Z71 4x4 Crew Cab LTZ Silverado 5.3 with 6 speed auto and runs just fine but reading post on the internet will scare anybody. No Throttle problems, no Tranny problems, No engine problems, No paint problems, No electrical problems, No issue with shift points, No issue with AFM. Owned it 3 Months 9from new) and have about 13,000 miles on it now The Cons are: 1. It's so quiet that I try to fall asleep on the highway. The Pros are: 1. I could list at least 200 Pro's over my 2007 Silverado Classic 5.3 (non AFM) and more than half would be technical. So now you know. This truck is not lacking in any way. I don't really understand why so many people would buy a truck they didn't like or want, ya know? with AFM? Sell it and get a Ford. This truck is my Cadillac and I seriously doubt anybody is gonna improve on what GM has built here with a hack saw underneath it in the back yard. Just a clue how AFM works...very simple. The cyl's that de act have special lifters. What's so special? They have a locking pin, that's it. Those cyl are de act mode with less than 6% throttle or load...this is decided by several process in less than 20 milliseconds...they are pressurized in de act mode (4 cyl) controlled by solenoids in the oil galley under the intake manifold. If that system was to fail (de-pressurize) it would default to a V-8. It's simple and it works. On a 80 mile drive thru the hills and curves I was able to attain a high average once of 24.4mpg I get 23 often and have got 21 driving 70 mph. There are alot of parts in this motor that will fail before AFM does...Jeezes. I'm going to put 300,000 on mine then recheck it and see how it's doing then. I have bought 4 new GM vehicles in the last 3 years or so...1 of them had a minor quality control issue that was probably done by the transport driver. 1 was traded on this truck, the 2007 Silverado. It had 86,000 miles on it and zero parts replaced. just tires and oil. This won't be fun if we didn't get a little OT and throw in something about oil...I do have to admit I did develop the dreaded tick at start-up. I don't know what factory fill was and you don't either unless you put it in. That's why I drained that stuff the same week I bought it. Well I went with Mobil1 I have been running for years no problem and then after say 3000 miles, tick for 2 seconds at start-up every time...then started it sometimes even when warm which raised my brow. And NO it's NOT THE AFM...remember, the lifters have to be pressurized in order to collapse. Anyways, left that crap in there too long but switched out to The Castrol Edge USA made 5w-30 and about 1000 miles later presto! no more tick, at all. none. Mobil1 filter. I don't care what bobtheoilguy says this stuff works and it meets all current GM specs. |
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