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
#287 of 415 Re: 2007/2008 Sierra Active Fuel Management Problems [3jp]
Oct 02, 2012 (7:30 am)
Good morning 3jp,
Please keep us updated on the progress of your investigation with the dealership; if you want for us to check into it further we can set up a Service Request and do so. Please email us at socialmediagm.com with more details (including your name and Edmunds username, phone and address, the last 8 digits of your VIN and current mileage, and the name of your dealership).
Sarah, GM Customer Service
#288 of 415 Re: 2007/2008 Sierra Active Fuel Management Problems [3jp]
Oct 02, 2012 (7:33 am)
Check to make sure the drain passage from the heads back to the oil pan is not being restricted in some way, but it may still be using a little oil.
#289 of 415 Re: 2007/2008 Sierra Active Fuel Management Problems [3jp]
Oct 02, 2012 (7:37 am)
So basically the truck needed two quarts of oil. How many miles were on the oil since the last oil change?
GM considers a quart every 1,000 miles as normal. If the truck had 2,000 or so miles on it since your last oil change it would be considered "normal".
You need to check the oil every other fuel stop. And coach your wife not to stop at an Autozone where apparently they don't know how to add a proper amount of oil.
#290 of 415 Fuel Mgt Problem
Oct 11, 2012 (4:13 am)
My 2008 1500 pickup started running very very rough all of a sudden. I went to the closest mechanic I could find in a very small town. We don't have a GM dealer. He told me GM is having all kinds of problems with the 2007 and 2008 1500 5.3 engines. Fuel mileage and oil consumption is the smallest of the problem.
Luckily, he owned a Device that read codes he got from Napa. It showed the number 6 cylinder was bad and an O2 sensor.
He put in all new plugs, new plug wires and one O2 sensor. He took it for a test drive and within two miles it was it was doing the same thing. The Stablizer and traction control light came on and also the check engine light as it had for me when it started running very very rough. In my case, it was the number 6 plug. Three different GM mechanics at three different dealerships told me that it mostly affects the plugs on the right bank, and can affect any of those plugs, one told me that he had seen it on the number 7 plug twice.
GM is well aware, as well as their service depts since GM has issued bulletins to the dealers regarding this issue. These bulletins are not for the public.
What happens is the fuel mgt system shuts off the fuel to the right bank and the lifters won't lift the valves for lubrication. Then, the lifter fails, the roller for example breaks off, the lifter slides inside itself, etc. as a consequence it wears the lobe off the camshaft, then destroys the camshaft. Replacing the bad lifter and camshaft will not solve the problem, maybe temporially, but not for the long term.
In my case, my pickup went out of warranty, GM refused to fix the problem. If you are having any issue with oil consumption, bad fuel mileage, running rough; RUN DON'T WALK TO YOUR NEAREST GM DEALER ESPECIALLY IF YOU ARE UNDER THE 100,000 MILES AND DEMAND A NEW ENGINE.
Repairing the engine does not work. I was told by one mechanic he saw an engine repaired with a new lifter, etc. and a few thousand miles later, he had the same problem and ended up buying a new engine.
The only thing to do is get a new engine. Guess what? GM now has their fuel mgt. system on the 2013 2500's and as I understand it on the 3500's also.
It looks like I'll be buying a ford sooner than later. We can thank California and the EPA for all this crap the manufacturers have to put on vehicles these days.
However, it really pisses me off with service managers and a district manager lies to me about the problem.
WHATEVER YOU DO, DO NOT LET GM REPAIR THE ENGINE. I BELIEVE, IT WILL COME BACK TO HAUNT YOU.
#291 of 415 Re: Fuel Mgt Problem [rem308]
Oct 11, 2012 (9:05 am)
"He put in all new plugs, new plug wires and one O2 sensor. He took it for a test drive and within two miles it was it was doing the same thing. The Stablizer and traction control light came on and also the check engine light as it had for me when it started running very very rough. In my case, it was the number 6 plug. Three different GM mechanics at three different dealerships told me that it mostly affects the plugs on the right bank, and can affect any of those plugs, one told me that he had seen it on the number 7 plug twice."
S0-he did work that really wasn't going to cure the problem and misdiagnosed what the issue(s) were?
How many miles exactly did you have on the truck?
Your truck is out of warranty.
How long do you think any manufacturer should be responsible for your vehicle?
#292 of 415 Re: Fuel Mgt Problem [chuck1]
Oct 11, 2012 (10:48 am)
100,000 miles, it now has 105,000.
The problem definitely was occuring prior to 100,000.
Apparently, you are a GM employee, your tone certainly indicates it.
#293 of 415 Re: Fuel Mgt Problem [rem308]
Oct 11, 2012 (1:35 pm)
Not a GM employee - not at all. But there are several posts like yours. Who's fault is it that YOUR MECHANIC did not diagnosed the problem correctly?
How long should manufacturers be liable for mechanical issues? 100K? 200K? 300K?
It's easy to get on the Internet to complain. Harder to get some real facts on this forum sometimes as to what the real circumstances are.
#294 of 415 Re: Fuel Mgt Problem [rem308]
Oct 24, 2012 (10:18 am)
Apparently, you (Chuck 1) are a GM employee, your tone certainly indicates it.
It's obvious that Chuck1 is being paid well by GM. It looks like he's been posting on this site for years and always very quickly degrades anyone's compaint and sides with GM. NOBODY would waste that much time making himself available to respond in the defence of any giant corporation without being paid unless.........., well I can't think of any other reason??
#295 of 415 Re: Fuel Mgt Problem [string2]
Oct 24, 2012 (11:47 am)
I have been posting for years because I have been a member of Edmunds for that long. In addition, if you check my posts it is clear what cars I have owned. As an ex-owner of a Toyota 4Runner (that I towed with) and Honda Accord, I have contributed on those forums. Check out the 4Runner towing forum. A GM employee would NEVER OWN A TOYOTA!
I DON'T SIGN ON TO EDMUNDS JUST TO COMPLAIN.
The thing that gets me agitated is when someone comes on here and says my truck isn't working right because the alternator is discharging. IT'S SUPPOSED TO WORK THIS WAY!
This isn't fair to people who are looking at these vehicles.
Then they try to justify what they are saying because they work on computers.
OK-I guess some know more than the engineers who designed the Silverados.
#296 of 415 Re: Fuel Mgt Problem [rem308]
Oct 26, 2012 (8:36 am)
I agree with you 100% How do we get the word out about these AFM engines? I share your pain too. I didn't realize these were defectively engineered engines until now.
I have a 2008 4x4 Z71 with 5.3L AFM. Primarily highway driven miles with weekend hunting trips, but no heavy duty offroading. Oil changes at recommeded intervals; minimal oil loss between.
At 145,000 miles, the lifters & camshaft went out. I think AFM shortens engine life. I've owned GM trucks(and Fords and Dodges) for three decades & normally get 300K miles from a motor. Of course, GM won't even share in the cost of repair - which is several thousand dollars - as the mileage is out of warranty. Even though I like the styling, handling & performance in muddy conditions, I'll be swapping for a Ford or Dodge or try a Toyota asap.
Like you, if you own one of these engines, be sure to trade if off before the warranty expires, or even better, buy something else to begin with!