Then it takes out the lifter again and again until you bite the bullet and replace the cam. I speak from some experience. My daughters car had about , miles when she complained of the problem. She had driven it for a couple of months that way. I told her to never pull the gadget out.
She started to have the lifter problem again after 60, miles more. So I did the job one more time. Told her that it would not last and that she needed to find a different way to get around. She drove it for another 35, and it went out again. But then she passed away from cancer. I am going to do the full repair of the engine now, but not an overhaul too hard to get at the pan.
But I can replace all of the other engine parts without doing the pistons and bearings — so that is what I plan to do. If I had been able to push the issue and get the time, I would have done the full fix at first without the hassle. This is my project car and will be my drive about miles a year. Because I want to. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on?
Chris, when you did your delete, did you also change the cam at the same time? If you left the original cam in, the AFM cylinders will be down about 25 lbs. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine.
One alternative is to swap in one of the larger 6. I just did the delete and replaced the cam as well. Still have no power. I have no clue what to do now. I have already dropped a lot of money on this truck 08 suburban. Any help would be appreciated. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash.
They may be able to find some of those missing ponies. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. A tuner can often fix that as well by giving it some more ignition advance in these regions. You also need the disabler installed in your obd connector.
I had the same issue and had to have the AFM information deleted from the computer and the car tuned. Question — i just bought a Saab with 5. I guess they also went to aluminum blocks in , not sure if that has anything to do with this issues… thanks for the advice! You mentioned that it will shoot oil into the pan and on the cylinder walls possibly causing some oil consumption… So i have a running vehicle and my only concern is making it as reliable as possible, should I disable the AFM or not??
The vehicles affected were to Feb. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. Another option is to plug it entirely if the AFM is already removed. It uses a M14 x 1. It also mentions a valve cover replacement with revised PCV valve design. I guess I might have to call a dealership or GM to get a definite answer on this one. As a side note, the early ones had a 24x reluctor and plastic chain guide good vs.
At this state, a disabler would probably do what you need it to do. You may want to update your post. I ordered a electronic disabler for it today. In the mean-time I found that you can keep the engine from going into 4 cyl mode by using the manual shift if so equipped and keeping it out of 6th gear. Regards, Dave. My Silverado 5. Accept i only have 60K on my truck and it hasnt recovered.
I tried the trans fluid in the oil. Then changed the oil. Then had to drive the truck back to Tampa from Cheifland Fl. This happened on a camping trip with my kids last friday night. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Then I guess I have to spend a bunch of money and get the delete kit. This really sucks.
I loved this rtuck until this happened!! It is being covered under warranty since I only have 72, miles on it. Since it is not costing me anything out of pocket, I did not go with the Delete Kit did not want to spend the money. Once I get it back, could I install the Disabler safely. I would rather stay a V8 full time than deal with AFM issues in the future.
You are correct. Install the disabler when you get your Yukon back and it will remain in good working order. We were getting a code that the cam position sensor was not functioning properly. As it turned out one of the cam bearings was failing and causing the cam to wobble my guess which messed up the AFM and probably some other stuff too.
The engine had K miles. As we were installing the sensors prior to installation in the vehicle, we noticed that there was no fitting on the oil pan for the oil level sensor. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting.
They learned that the oil level sensor was necessary and that we were supposed to have been advised that we needed to reuse the original oil pan. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block.
In other words, the crankshaft and bearings were not visible. Is this the shield you referred to in a past post? Side note, after hundred miles of trouble free driving the transmission failed so we had to replace that too.
I am leaning heavily on installing the AFM disabler. Hi Mike, the metal shield you noticed is probably the windage tray. The Oil pressure relief valve deflector added in Oct. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually mph and highway speeds around 75mph.
Took it to a shop and they advised that it could be due to the AFM system not functioning properly. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not?
The car runs great apart from the shuddering at those speeds. Would it be fine to go ahead with the AFM Disabler? Brian, I have the same question as Scott. I also have 08 Burb, but have different symptoms high oil consumption, blue exhaust smoke at start, and now a really rough start after sitting overnight. How do you know if the lifter has failed? Do you think I can still disable AFM? Brian, I have a burb with the exact same symptoms and questions as Shawn… please help! It will show up as a misfire code in a cylinders 1,4,6, or 7.
There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. This may show as low oil pressure or code P or P and is a relatively inexpensive fix as well. This is how mine started out…then 6 months later on the highway the service stabilitrak light and flashing engine light came on. Stopped at nearest gas station and found I was a quart low on oil…added oil and lights eventually went off and luckily we made it the 5 hour drive home.
Next day I drove my car to work and was fine but when I left work all lights came back on and terrible noise in the hood. Took it to my dads and he tore things apart and found that I had a lifter that was stuck.
He unstuck it and I took it for a drive and same thing happened. My dad ended up running seafoam through it and some transmission fluid, changed the oil pressure sensor which I definitely think was bad and also cleaned out the little screen and he said it was so full of junk and metal scraps.
I am hoping this does the trick. I always have done my oil changes on time, not sure about the people who owned it before me though. Although the last oil change I had they offered a more expensive oil that would let me go every 5, miles and when this happened I was almost at 4, so needless to say I will never do that again…. However I do have 7 year bumper to bumper warranty that covers this problem if I start to get lifter problems over the next 2 years..
On the other hand if get the AFM disabler installed I am pretty sure that I void the warranty from what I read on the policy. The problem I am facing is that I want to drive this vehicle for at lease another 77K and do not want to drive my vehicle with this AFM issue.
What would you do if you were in my situation? As a side note, Range Technologies recommends removing the disabler between visits to the dealer as they will need to access the OBD-2 port. I am going to buy a new truck in about a month it would be a Chevy but Dodge has lifter problems so they are out and Chevy has DoD problem.
If they come out with Silverado without the DoD then i would buy one. I have a Chevy Tahoe with the 5. I am trying to find out of this is true. Diablo says yes but they do not provide tunes. There are no changes in the valves or the springs.
I have also heard that the oil pump is to be changed and I have also heard that it does not matter. Very confusing stuff out there. Any advice that you could offer would be great. Thank you for your time. A custom tune by a knowledgeable tuner with access to a chassis dyno will pay a lot of other dividends other on top of turning off afm and VVT. You will get codes thrown if the afm is physically removed without telling the ECM you did so.
I ave noticed the point about excess oil spray. My point is that the engine likely on uses dod a small percentage of the time so can not really imagine that the delete causes any more issue than normal which may be the high oil consumption but do all of these engines with dod consume a lot of oil?
I was looking at the 08 escalade hybrid with dod on its 6. It seems to me that the high volume oil pump should not hopefully cause premature wear but if it is pushing more oil through the heads than I guess the valve stem seals have more work to do. It was good for about 10 miles and started with same loud knock noise.
Have misfire code and engine has what I would call a surge while driving. Is this due to the AFM being shut off? There may be an ignition related issue on that cylinder. Yes, always change all the lifters at once. What was happening to the first is slowly or quickly in your case happening to the others.
I can tell you for the past 2 years I changed out my LC9 5. I have read synthetic isnt good for AFM lifters. Any truth to that? With I ran 0W on more the miles between changes. No problems with any to this point. With I ran 0W no more the miles between changes. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? Mine did at the exact same time. Pingback: LS9 6. Yeh truck has miles on it Oil 0w or 5w Thanks.
The Jury is still out on the Gen. Hopefully more is known by then. Brian, we have a Yukon Denali in our shop with a 6. We have purchased a used low mileage 6. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire.
Then again, it should have never been controlling those solenoids. Any thoughts or suggestions would be appreciated. Billy, there is some interesting trivia here on the L Per bulletin b, L92 had first and 2nd design. The 2nd went with a conventional valvetrain. Please report back if you have any issues, but I think you are in good shape.
Brian, thank you for the quick response. We chickened out though and just bolted the AFM solenoid plate onto the used engine. We figured we already had the intake manifold off to install the engine, why run the risk of MIL only to have to removed the intake manifold again without being paid. We did take it apart to check for metal possibly being trapped inside, it looked like brand new.
We believe this confirmed that the AFM has never been operating in this vehicle. Thank you again for the response. Sylinder one lost compression on my 09 5,3. No movement on the rocker arms. Replaced all lifters. No it runs fine on sylinder one but not on 6 or 7!!! Pulled the inntake and replaced valleypan With all the solenoids. Did not help. Pulled right valve cover an rockers on syl 6 dont move.
Well, they move a couple of times after startup thats all. Asume its the same on syl 7 on the other side. Disconected the Connector to the solenoids, no difference. Seems my oil pressure sensor is bad, are showing the same oil pressure at all times, even when it dosnt run. Dont know it that fault was there before i replaced the lifters. Bought car 1 day before lifter died!
I asume low oil pressure cant make some of the DOD lifters to malfunction? All New lifters were from AC delco. Can they be faulty? Its not possible to install them wrong? They layed over night in engine oil before instalation.
Thankfull for any ideeas! Took the heads off again. Installed them again, all facing upwards, will know tomorrow if that was the solution. If this is the cause i cant beleve why they arnt build so that it is impossible to install them the wrong way in the plastic holder. And altso that there was no warning or installation advice With the New lifters.
If these are the only lifters in the Whole world that must be in stalled in a certain way a warning wouldn be a bad idea…. Ketil, let us know what you find out. Their tech guys have seen it all and may have some thoughts on this as well. Thanks for your help. Truck has an active P code and runs very rough. Found that all passenger side cylinders are not firing. Only running on drivers side cylinders. Driver reported this occurred suddenly while driving down the highway.
Truck ran fine before that. Not sure which direction to go from here. Pingback: LMG 5. Everything else looked good. Replaced all lifters on passenger side as well as pushrods for even wear. Everything was fine for two weeks, ow customer complains s it same noise it made as before. Replace the cam or do the delete kit? It does seem that when they start going…they go quickly. There is a chance the cam lobe was stressed and started to deteriorate. That might show up if you cut the filter and looked for debris in the pleats.
So two weeks ago with approx 70K miles, I had an odd noise when accelerating and then engine light flashing and riding rough. Glad I did. Covers me to K. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Shame this happened. Love the truck. Have an intake and Borla exhaust. Open to suggestions about best course of action. Have a lifter problem on my 5. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up.
Now the problems back, I have k miles on it now. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. No clue what to do. The lifter seems to recharge whenever the truck sits for some time. Can you tell me what needs to be done with the VVT? Hello Brian, I just purchased a Silverado with a 5. I traded in a 4. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage?
Should I wait until the warranty runs out, or will that be too late to stop possible damage? Does the disabler prevent the engine damage in the first place? I love the car so far. Is there any potential down-side to doing this — in other words, might this do more harm than good?
I am wondering the same thing. I just bought a Silverado. It has 8, miles on it. I just took a long trip and it used 1. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? Why have you not gotten a reply from Mr Nutter.
Buying a Silverado 6. Friend will send to me from Arizona. AFM shuts off half of your engines cylinders to operate at a reduced power level to reduce fuel consumption when running in low load and cruise situations. While AFM would shut-off the same cylinders every time the system would activate, with DFM, the engine has up to 17 different patterns it can run in depending on load and other inputs.
With DFM, the engine can turn off two cylinders, four cylinders, or any of the eight it sees necessary to meet the current situation and demand. There have been studies held that back the claims with data and vehicle owners can attest to seeing solid mileage from their GM V6 and V8 engines, especially when compared to that vehicles counterpart from another brand. So how does the system actually work? In the low load situations, the vehicles computer will send a signal to the engines Lifter Oil Manifold Assembly, which activates solenoids that open allowing oil to flow through special lifters housed within the ADM towers of the engine block.
No programming required, no permanent changes to the vehicle, and best of all, no traces left on the PCM should you still be under a factory warranty. One part number covers just about every applicable GM application from and the module can be moved from one vehicle to another at any time. There is no learning curve or homework required. Are you tired of the annoying shuddering of your engine and the drone it produces from constantly activating and deactivating cylinders?
Our module is plug-and-play and reverts your vehicle back to stock when removed. Because no tuning is involved with your vehicle's computer, this product will not void the factory warranty. Not only does the AFM Disabler keep your vehicle running smoothly, but it will also have you running on all cylinders, all the time. Read More. What is it?
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