Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Chevy Silverado and GMC Sierra Active Fuel Management Problems



  • Just becasue there are not posts on Edmonds forum, does not mean that there are not many others. If you google online, it is obvious that this problem is rampant. Per a mechanic at the dealership as well as a service writer, "it is not a matter of if but rather a matter of when." They have trucks come in as early as 50k miles (50k!!!!!) and some as far up as 175k miles. It is more than obvious that it is a design flaw.

    Funny thing remains. I will be getting a new truck this year. No...not because of this problem occuring, but because it is time to trade in. They have had my business since I was 24. I have bought brand new Chevrolets every 4-5 years since. They will be the ones losing on this...not me. It may be such a minor amount to them, but it is big to me and I am happy they turned their back on me so now I can do the same.
  • Sarah,

    You coming on here acting like you care is even more frustrating. Unless you have a solution to my problem why comment. If you said, hey Wes we know that lifter problem is a known issue on your truck. We can help, here is a solution....

    My extended warranty just expired two months ago. The dealer isn't willing to help. The solution is the replace the bad lifter and pay out of pocket, that is a band-aid until the rest of the lifters expire. All the lifters need to be replaced, so I don't have continued issues in the future.

    Please stop the comments, making people think GM really cares. Actions speak louder than words.
  • Chuck,

    If GM leaves me hanging out to dry on this (which is sounds like it), I'm done with GM as well. I will encourage my four kids to never buy GM. I'm a pretty young guy and I've always had Chevy trucks. I hate to say it, but I'm going to be looking at Ford's very soon. What makes matters worse is I will tell everyone I know about my situation. My friends and family know i keep my truck in perfect condition.

    I wish you the best.
  • i have same problem with my 5.3 afm 2007 avalanche found out it is the lifters that cost about $2000.00 from dealer, there must be a bad design that they don't want to admit to. Cause every one i know has this noise problem. I finally solved the problem with out spending thousands of extra dollars which I have already spent $ 2600.00 and still broke down 4 more times, which found out some lifters were not replaced and not very happy. the afm lifters are failing but can still be used, the lifter internals can still pump oil and if your mechanically inclined can get an old chevy push rod the one with out the round tip and grind it down and before you do this you can put it in and see for your self that it pumps oil. I should have got the measurements but it was trial and error at first, cause if you take it down to much it will not pump oil, and if to long will cause your engine to run tight
    they are not like the old motors you can adjust the rocker arms, new ones just bolt tight. i think they should recall all afm lifters
  • Going to a lawyer to find out if GM can be sued for not helping with this problem. I have the old afm lifter in my hand and i'm just pissed off. and motor only has 92000 miles and used royal purple with k/n oil filters always kepted up with my vehicles with the best.
  • total engine failure took off heads today afm lifter collapsed roller was gone cam is gone found out it was the oil pump all along.
  • chuck1chuck1 Posts: 1,405
    Respectfully dude...I know your upset.

    But a Lawyer and court costs are far more than rebuilding your own motor. I understand you can change the crankshaft and valves and have a non-AFM motor.

    Or, check in to a crate motor and see what the specs are on those.
  • jswain2jswain2 Posts: 16
    I'm mechanically inclined, but not that mechanically inclined. Not too comfortable with taking the heads off the motor, etc. I've been trying to trade the truck in on something else, took a day off work and went car shopping, but will lose a lot of money if I trade it. Who knows, might luck up and find something I can trade for even if I have to trade down considerably. I'd take roll up windows and rubber covered floors if I could get rid of the damn ticking, rattling, spark knocking, whatever the noise is. I've grown to hate that truck.
  • austyn0526austyn0526 Posts: 1
    edited February 2013
    I have a 2008 Chevrolet Tahoe LTZ. I really love the design of the truck and all of the "bells and whistles" it has to offer. Now I'm starting to hate this truck. I took it to the dealer when it had 83,000 miles for oil consumption issues. They fixed this under the warranty by replacing the pistons and O rings (or so they say). The truck now has 124,000 miles on it and now needs lifters and a camshaft. I paid $40,000 for this truck and can't believe that GM won't own up to their mistake. I spoke with the service rep and he stated that this did not come from the warranty work they performed. After reading here I see that this is an engineering flaw by General Motors. I have been in touch with a Customer Service Rep which I believe to be pointless. I purchased this vehicle as a long term investment now I have to spend at the very least $2500.00 to have it repaired. If I don't hear anything back from GM I will be selling my other two GM cars and trading the Tahoe. I have been a loyal customer of GM since I have been gainfully employed and currently own 2 more GM Vehicles. I had an oil consumption issue with my 2001 Cadillac and they repaired the issue under warranty. I currently have 170,000 miles on the car and have had no other issues. 170,000 on a Northstar from what I hear, is extremely rare. Now they are making a sub par product and won't admit it. If I don't hear from them soon I will be fixing this truck (which I love) and go trade it at the Toyota Dealership for a Sequoia. I believe in buying American but not throwing my money away. I feel as if I have thrown my money away. My father has two GM Trucks one has over 250,000 miles on it and the other has 130,000 and never had any engine issues. This is how I know it is due to the active fuel management system. I hate to start buying foreign but what choice do I have at this point.
  • I feel your pain. After approving the replacement of bad lifters and ruined camshaft(at my expense, no help from GM or the dealer), I swapped my ride for a 2012 Dodge Ram. I have nearly 10,000 miles on it and it is fantastic. I didn't realize the additional power the Ram Hemi 5.7 has over the Chevy 5.3. When pulling a trailer loaded down with atv's, hunting/camping gear plus more, if not for the rearview mirror, would not even know the trailer was back there. The Chevy struggled at times, especially on hills. RAM has the MDS system, but after searching & searching, have found no one with issues. Hopefully it'll last for the long term. I have to laugh (or cry) every time the "Chevy - longest lasting truck on the road" commercial plays. Fool me once, shame on more GMs for me. Fords or Rams, maybe a Toyota. Best of luck!
  • The dealer has had my truck for over a week now trying to fix the collapsed lifter problem. They have changed the lifters the oil poppet valve and the inlet screen on the lifter control module and it still is not fixed. The only thing they have not replaced is the control module. The first time it went in for the problem they changed the lifters and it worked for about 8,000 miles before it did it again. The second time it cleared up and they said they could not reproduce it. Now the truck is past the 5 year point on the warranty. Since the problem was never fixed properly when it went in the first time shouldn’t it still be covered under the warranty?
  • Yes, it should still be covered. If they can pull up in the computer where a problem was noted before warranty expired, they should still cover it now.
  • Update… It took two weeks to finally get my truck back. I had to go to the dealer and talk to the service manager and the mechanic to tell them how to fix the problem. They had changed out all of the fuel control lifters, the poppet valve and inlet screen to the valve control. Basically they had changed everything in the system except for the controller with the four solenoid valves in it. I explained to them that the only thing left to do was to change the controller assembly. After they finally changed it out the system worked just fine. I went directly to the service manager when I went to pick the truck up and had a chat about how it should be covered under warranty because the problem was never fixed correctly the first time they had it he changed the invoice and GM paid for the repair. If it comes back again I’m dumping the truck and getting the diesel 2500 or getting a Ford. I’m done with the crappy GM fuel management system.
  • They covered it but only after I forced the issue.
  • chuck1chuck1 Posts: 1,405
    Unless you really need the pulling power of a diesel, the fuel and maintenance costs are prohibitive IMHO. Look at a Ford F150 w/the 5.0 or the Tundra or Dodge w/their biggest gas motors.
  • wvhotshotwvhotshot Posts: 5
    edited March 2013
    Update: After I got the truck back it has no low end power, a miss that it didn't have before and at hwy speeds the RPM is 400 higher than before. The engine also feels like it has a surge when driving down the hwy almost like it stops firing for a split second. The gas mileage has also dropped by 4mpg. I took it back and they had it for a week and then changed out the torque converter saying it was locking up too soon???? When I picked it up on Saturday and drove it and nothing was fixed from before but now when driving in slow traffic it feels like the thing has a stall speed converter in it. From a rolling start the engine revs up before the converter engages and you here it when it does go into engagement thru the drivetrain. They reprogramed the computer after doing the lifter work. Did GM make changes to the programing for the transmission shifting points and converter lockup? It is now the 4th week they have had the truck and all I keep hearing is “we don’t know what’s wrong with it?” Please help
  • I need the pulling power. That is why I got the MAX tow package truck with the 6.0L.
  • msw007msw007 Posts: 21
    So I would like to discuss our recent troubles with our 2007 Chevy Tahoe LT 5.3L. We were finally able to purchase our first new car, 2007 Chevy Tahoe LT, ever in October 2006 from our local dealership. We decided on the Chevy Tahoe because we have had a used Chevy Suburban and Used Chevy Tahoe prior and have had excellent experience with both of them. It was truly a wonderful experience until now.

    Flash forward to October 2012. While traveling several warning lights came on “Service Traction Control, Stablitrak, and Service engine”. We brought it to the dealership a few times to scan for a code and they couldn’t come up with anything. So now we had to wait until it was actually happening and rush it over to the dealership so they can scan for the code while it was happening. Finally it was happening enough that we were able to get it to the dealer for the scan. The scan revealed that spark plug #1 was fouled and would cause a chain reaction on all the computers to go haywire. So they did a little research and they found a GM TSB (technical service bulletin) that said replace the valve cover gasket, replace all the plugs and wires. Keep in mind these are 100K mile platinum plugs/wires and we currently have around 79000 miles on the vehicle (GM recommends replacing these items at 100K miles). So we did what we were told and $700 later we were on our merry way.

    Jump forward to January 2013. Now we start hearing a clunking sound on acceleration. We bring it back to the dealer and they can’t seem to find anything (of course not????). Now February the sound is more apparent and all the warning lights have come back. I decided to take the car to a friend of mine who has a local shop and specializes in foreign autos. I knew he would take the time and do the research to finally tell us what the dealer couldn’t. After having the car for a week the verdict was in. GM has this fuel management system introduced on this particular 5.3L motor in 2007. It’s supposed to be able to switch from 8 to 4 cylinders and back to help save on fuel (Active Fuel Management or AFM). To confirm the problem he would have to tear down the engine and check the intake valve on cylinder #1. This is when I said “I’m taking it back to the dealer”.

    Now the dealership has the car and I didn’t mention that I already had it looked at. I wanted to see if they would come up with the same diagnosis. Well after a week they did. I can’t believe it since the initial $700 fix 3000 miles ago in November 2012 I now have to replace the engine, WTF! Needless to say I was not a happy camper. Now the car has been out of warranty for a little over a year (which has been pointed out to me over and over again) but that’s not the point. The point is we bought a brand new car so we wouldn’t have any problems usually associated with used cars. A car that has less than 100K miles on it. A car that has been religiously serviced by our local Chevy Dealership. And now I’m being told I have to replace the motor!

    The dealership called GM. GM was quick to say they would replace the motor and cover 50% of the costs? Well whoop de doo. Why were they so quick to offer that deal? Of course they are replacing it with a genuine GM remanufactured motor with a 3 year/ 50K warranty and that’s all they are willing to do. I don’t expect the dealership to cover all the costs and it would be nice if I wasn’t out of pocket any. Yes I know the car it out of warranty but I expect GM to back up their product. Did I mention I have purchased over $100K in new Chevy vehicles over the last several years.

    So the car is no good to us. Can’t drive it, sell it or trade it in. I basically have to take the deal. My estimated out of pocket will be $3K plus tax.

    So I decided to call GM directly and talk to them in a kind Christian sort of way (as only I can do). I figured if they heard from the customer directly that they would be willing to at least come down a little. I know the car isn’t under warranty. The results were not what I was looking for. After they gathered all the information from the dealership and me as well they will only cover 50% of the cost. I explained to them that I’ve been a loyal customer, this car had less than 100K miles on it, I’ve spent over $100K in Chevy cars over the last several years. Nope all they would do is 50%. I asked would they would at least reimburse me for the $700 that I already spent that was totally unnecessary? Nope only 50%. Well let’s just say things went pretty much south from there.

    So here is where we stand. The dealership is putting in the new motor. They are working with me to get the price down under $3K. I don’t begrudge the dealership I think they did what they could do (as personally later found out with GM). I don’t begrudge the lady at GM I’m sure she has set parameters she has to follow and she’s just a drone in the corporation. However I do begrudge GM for not standing by their product. Do the research it’s all over the internet. GM has a problem with this motor and it’s “Active Fuel Management” they know it and they will continue to have problems. Unfortunately if you do have this particular motor there’s no way to check if you will have this problem or not. I will never buy a GM product again. They have lost a loyal customer over $700.
  • chuck1919chuck1919 Posts: 176
    How long do you think GM should be responsible for your car? 3000 dollars is a deal for a GM backed motor-take it!
  • churchy25churchy25 Posts: 12
    Dumb question. Of course it's a good price....a good price on a new motor that should not have to be purchased for a vehicle with 80k miles. When the vehicle goes out of warranty u understand that maybe u will need to repair an alternator, battery, fuel filter, fuel pump, oil pump, etc. u don't expect to replace a damn motor. AND if u r the only person with this problem, it would make it easier to swallow having to pay for such a repair. But when u see this problem is rampant and GM is hiding from it even though they know the AFM has a serious design flaw, it really pisses people off. They lost my future business for ever with almost the exact same story as above. I've bought a new chevrolet truck every 4-5 years since 94. No more. EVER! And I tell everyone about this design flaw and what GM actually does about it. My sister actually bought a Ford Edge instead of a Chevy Traverse simply because of my experience. It's a shame. It's not the same Chevrolet that my dad was a fan of.
Sign In or Register to comment.