Last post on Nov 26, 2013 at 5:54 PM
You are in the Chevrolet Silverado & GMC Sierra
What is this discussion about?
GMC Sierra 1500, Chevrolet Silverado 1500, Fuel System, Truck
#307 of 415 Re: 2008 "Certified" used GMC Sierra [jswain2]
Dec 15, 2012 (7:45 am)
Sorry to hear of your lifter troubles. At least your engine still functions. My advice is to trade it in on the Ford truck you've been considering while you can still realize some value. Once the general public comes to realize Chevy's AFM design is flawed, and that GM will not help outside of warranty, you can expect the value of used GM trucks to diminish - considerably. Right now, there is limited knowledge of the situation, noting that you were unaware when making your purchase.
Best of luck & happy holidays.
#308 of 415 2008 Silverado 5.3 AFM
Dec 17, 2012 (4:14 pm)
Just had to have my engine pulled for lifter and camshaft replacement. 118k. I know, Iknow...it is out of warranty. CS told me that like 1,000 times. Bottom line is this....in no way should a chevy truck need to have engine pulled this prematurely. Dealer mechanics say it is NOT a normal wear and tear issue, it is NOT a lack of proper maintenance issue, but it IS an engine design issue. While Chevrolet likes to pat themselves on the back by helping with some of the cost of the repair, I was still left with paying for the majority of the repair....even though it is a design flaw. I have purchased Chevy trucks brand new since I was 24 (able to buy one on my own) since 1995 and bought one every 4-5 years. My dad was a die hard Chevy fan since his first purchase in 1957. NEVER again for me. They turned their back on me and therefore I am turning my back on them as well. I am sure they are not loosing sleep about it, but it is what it is. I will be making sure that everyone I know in the vehicle market will know the specifics of my experience and everything that I learned about this "Design Flaw" before they make a purchase.
#309 of 415 Re: 2008 Silverado 5.3 AFM [churchy25]
Dec 17, 2012 (4:46 pm)
How about other 08's like yours where there are not any wide spread issues? (They have not been posted).
Don't know how many trucks GM sold with the 5.3 in '08-but it had to be at least 30,000 units, probably closer to over 40,000 units.
#310 of 415 Re: 2008 Silverado 5.3 AFM [churchy25]
Dec 17, 2012 (5:01 pm)
I had a problem with the 2011 Silverado I bought new. From day one, the AFM wouldn't work at highway speed (70 MPH). I tried and tried to get them to fix it. They even acknowleged that there was some sort of drag on the engine that was keeping it from changing into v4 at hwy speed. Bottom line is, GM told me they were not going to do anything about it and I could do with it whatever I wanted to. My only way out was to sue or sell the truck. I traded it in on another vehicle about two months ago. It goes without saying, I didn't trade for another GM vehicle. I couldn't get GM to stand behind it. I felt like I couldn't trust them any more. I only had 12,000 miles on it? The mileage I was getting was 14 city 15 cith/hwy combined 16 highway only.
#311 of 415 Re: 2008 Silverado 5.3 AFM [string2]
Dec 17, 2012 (5:19 pm)
String also needs to tell you that he didn't need the truck anymore for the primary application he originally purchased it for.
#312 of 415 Re: 2008 Silverado 5.3 AFM [chuck1]
Dec 17, 2012 (6:21 pm)
Do you own a Silverado or Sierra with an AFM engine?
#313 of 415 Re: 2008 Silverado 5.3 AFM [churchy25]
Dec 17, 2012 (6:27 pm)
all I can say, in the words of Blake Shelton(country singer coach on the voice, aka, entertainer of the week), is "dang it". I feel your pain. I've also left GM for another brand - a RAM. Might as well join me and probably 30,000 or 40,000 others in the future according to chucky1. When you add in the cost of engine replacement, a GM truck can't compete with Ford, Toyota or RAM. It is what it is.
#314 of 415 Re: 2008 Silverado 5.3 AFM [sadsilverado]
Dec 17, 2012 (8:16 pm)
I own a 2011-5.3 with the AFM. I am currently on a cross country trip and have driven over 2,500 miles through all kinds of terrain pulling a 5,000pound 28foot travel trailer. The mpg towing has been between 10 and 14 depending on terrain, headwinds, etc. It's probably safe to say that no one here on this board is in the process of using their truck to travel across the country towing a trailer.
I have also driven the vehicle 3 times from So. Cal to Salt Lake City, UT ( and back-non towing) and have achieved 20 mpg consistently with the AFM in 4 cylinder mode. It's great feature.
I am the first to say the 6 speed transmission I S LESS THAN REFINED.
#315 of 415 Re: 2008 "Certified" used GMC Sierra [jswain2]
Dec 18, 2012 (7:20 pm)
Well I ran 2 cans of seafoam with a tank of 93 octane gas. The spark knock stopped, so when the tank was nearly empty, I put 10 gallons of 87 octane in. The spark knock has returned. My problem may be something simple like a partially clogged fuel injector, slightly faulty MAF sensor, eroded spark plug(s), faulty coil pack, etc, etc. I just don't have the time to chase the problem or the money to throw parts at it. The salesman from the dealership did call and ask about how the truck was doing today, but I was working and the call went to voicemail. I will call him back tomorrow and see if they want me to bring it in. What's strange is the new 2012 Silverado I drove with 30 miles on it spark knocked some. Of course the fuel in the tank may have been in there over a year, I guess. I wish the dang check engine light would come on so I'd know where to start looking. The engine also "ticks" at idle with the 87 octane fuel, not as much if at all with 93. Leaning towards a partially plugged injector...but I dunno. Bought this truck because I was tired of working on the 94 chevy and 98 dodge I sold to buy this one. Oh well.
#316 of 415 Re: 2008 "Certified" used GMC Sierra [jswain2]
Dec 22, 2012 (7:20 pm)
Emailed dealer where I bought the truck and told them the fuel treatment that was recommended by their service manager did not work to stop the spark knock or whatever it is. I have yet to see a response. I need to run this fuel out of the truck and try 93 octane again and make sure the noise stops. I'm not 100 percent certain it isn't lifter noise instead of spark knock I have an appointment with another dealer set for 12/27. If they tell me they can't hear the noise or the noise is normal, I'll be trading the truck for another brand. I didn't buy the truck new, but I laid down over $20k cash, and I don't intend to drive it around and listen to it make ticking sounds. It's frustrating because I'm sure I will lose money trading it, even though I've not had it long enough to even receive the title from the state. Started hearing the noise before I even got a tag on it. Sheesh! What a drag. I usually only trade vehicles once every 8 or 10 years. I try to get 200k miles out of them. I seriously doubt this one will make it that far since it only has 54k now. If I don't get it resolved the 27th, I'm f150 shopping. Ugh...I dread dealing with trading again.