The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. The computers had not evolved enough to control the sytem. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. They should let us the better mileage. No it runs fine on sylinder one but not on 6 or 7!!! Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. If you are using VVT, you could use the NAL-12612273 (L92) cam. 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?? There may be an ignition related issue on that cylinder. Question is, since my 2004 ECM and wiring harness were made before the AMF came about will this motor work properly as a V8 or will I need to replace the lifters, cam, oil sensor, etc as the delete method mentions? 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. Now you tell me AFM works and I will tell you; that you are full of shit! Then it takes out the lifter again and again until you bite the bullet and replace the cam. Oil flows to the special lifters through theAFMtowers. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. Replacing engine due to issues caused by AFM. Would installing the Disabler solve this? Yes a poor design but a flaw ? Now I get 24 to 26 with deactivation locked out and full power. In other words, the crankshaft and bearings were not visible. It also mentions a valve cover replacement with revised PCV valve design. As a side note, the early ones had a 24x reluctor and plastic chain guide (good) vs. the later ones with 58x and the spring loaded tensioner (not so good). I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. I know I felt the same way. Most of the complaints show up in the 2009 to 2011 model years. The dealer in Rockhill, SC when asked only said they had not had a problem. [], [] rugged iron block 6.0L came with VVT, but without Active Fuel Management, which saves you the cost of an AFM delete [], [] The LH6 engine is a 5.3L Gen. IV aluminum engine that replaced the LM4 in 2005. (Non-AFM engines have a smooth cover.). I got the AMF disabler anyway and so far so good. The Cylinder Deactivation system, known as the Active Fuel Management system by GM, shuts off some of the cylinders when extra power is not needed which improves fuel economy. Send response to tkrieg@cox.net. it is the regulator guy! He used seafoam and changed to synthetic oil. $8500.00 fix. I am not in a position to have a new cam and lifters installed but Im also not in a position to not having a running truck! It is being covered under warranty since I only have 72,000 miles on it. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. I have been assuming this is just a slow to pump-up lifter or lifters. Given that, would you recommend buying one of the OBD-II devices to disable AFM? [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. Then had to drive the truck back to Tampa from Cheifland Fl. what deleter (if thats a real word) have you heard good things about. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes If the 4th cylinder lifter has failed, would driving it damage the engine? Why cant u just unplug the solenoid on back of engine by oil pressure sensor? After taking a $3.6h bath on the lifter/valve work and doing a little research, how can GM allow a problem like this AFM continue from 07 to present? The biggest difference between the Vortec engines that used to be found in Chevy and GMC vehicles and the EcoTec engines found in them now are the fueling methods. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). Another option is to plug it entirely if the AFM is already removed. They took the engine down today found so much damage inside they ordered a new engine from Detroit. I havent has any lifter or cam issues. AFM Sucks!!! has 92,000 miles and was just told I have cam and lifter failure. Yesterday my motor (116,000 miles) felt like it went into limp mode when decelerating from 8 cyl to 4 cyl but it recovered.This is the second time that this has happened in 6 months so I think that I am on the slope. Since the tranny oil worked, you should now change the oil, right? General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. 2015 SILVERADO 1500 44 crew cab with 5.3L engine: So two weeks ago with approx 70K miles, I had an odd noise when accelerating and then engine light flashing and riding rough. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. Does the Pressure relief vavle ever go bad?? Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. [], [] LS Tech: How to Delete VVT or DisableAFM []. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Was a disaster then but a profitable disaster. Im crossing my fingers it does the trick! My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. Its Chrysler and Ford. Thanks for the advice Brian! Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. I love the car so far. As you said, the ECM was never seeing the AFM so I think youre good to go. Took the heads off again. . This happened on a camping trip with my kids last friday night. Sometimes it will do it all the time and other times can drive it for 10 miles and then it starts but doesnt do it constantly when driving. Install the disabler when you get your Yukon back and it will remain in good working order. I have an 07 Silverado 1500 ltz. 330-630-0240. Although the last oil change I had they offered a more expensive oil that would let me go every 5,000 miles and when this happened I was almost at 4,000 so needless to say I will never do that again. I already ordered the parts to replace myself and remove the code. It depends on the failure mode of the lifter however, certainly worth a try. One the other hand, it came without AFM, VVT, or flex fuel capability. You can unplug the sensor on the vacuum booster and it will fool the computer into thinking there is a high demand on the engine and shut down the AFM system but you will have a Check engine light in your face for doing so . My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. This system is the most effective way to disable AFM. They layed over night in engine oil before instalation. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. If you already own this engine you will need to deactivate the AFM system or even better DO NOT buy any GM vehicle with this engine. I am leaning heavily on installing the AFM disabler. I was looking at the 08 escalade hybrid with dod on its 6.0 so wondering if the delete would contribute to the high oil consumption and therefore would adding the deflector be a good idea. Can I (should I) also change to a standard volume oil pump? I had privilege to work on some of that garbage they never did work . I ave noticed the point about excess oil spray. I have read synthetic isnt good for AFM lifters. Does the disabler prevent the engine damage in the first place? Because its not just GM that have engine problems. I would just have the AFM disabled (tuned out) then. We chickened out though and just bolted the AFM solenoid plate onto the used engine. The biggest problem is nobody changes their oil on time. I was told that before I start the vehicle up I will need to have the AFM and VVT disabled in the ECU but that would require a custom tune from a tuner as the ECU cannot just be told that the AFM and the VVT is gone. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. Toyota has their own problems. Most will want to get rid of the AFM immediately and VVT isnt for []. Logic says that it should not as the ECM isnt programmed to use AFM, but will it see a lack of resistance from no solenoid pack plugged in? I would rather stay a V8 full time than deal with AFM issues in the future. I speak from some experience. You may want to update your post. If you left the original cam in, the AFM cylinders will be down about 25 lbs. All these comments on the 5.3 are blowing my mind!!!. Very confusing stuff out there. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. This lowers the cost of building it [], [] aluminum block engine. Now Im here tring to figure out what to do. I have always loved Ford and Chevys , I dont like this Vehicle not one bit, starring shaft has to be lubed or it whines, front A arms has done been replaced, tapping in motor, leaf springs has been lubed, retorqued, put completely new leaf springs back in on the rear , grease all down from rims to body of truck, you have to clean often,console shakes as if milk shakes in console which later they also put rubber bushings in front of coils of shocks ( front end) .You lock it down in 44 it s metal to metal , As of now Im at 32,000 done gone threw all the arbitrator laws depending on how it goes? Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Toyota will be my next truck unless GM owns up and makes wright with consumers. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . Will the plug in deactivater fix the oil consumption or will it cause more consumption? Ive been a Ford guy my whole life, so I was unaware of AFM until a recent trip where I did a lot of highway driving and happened to bring up the real-time mpg display, where I saw it switch between V6 and V4. Just pulled it down in the garage there was no other damage , luckily. Anyway that horrible experiment was in the late 70s early 80s along with those converted Diesel engines..those like the 8-6-4 nonsense were just terrible failures. Im servicing a 2011 Chevrolet 5.3 with AFM. Thankfull for any ideeas! Its got a hundred forty-five thousand miles on it. a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. Fuel pump failure is the most common problem and can occur due to a number of reasons, such as a clogged filter or a faulty pump. I wouldnt trade my 2000 Silverado, 5.3 liter that has constantly gotten 20 mpg since I bought it 15 years ago, for a dozen of these new $50,000 POS. Its a CA EMMISIONS TRUCK. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. the body is in great shape. Is the Pressure relief valve replaceable? Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. The original version sprayed oil on the cylinder walls and increased oil consumption. No problems with any to this point. A 17 with 5.3. Yes thats true. I am having that done today on my 08 Suburban and its only costing me $225. Have an intake and Borla exhaust. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. I have already dropped a lot of money on this truck (08 suburban). My concern is if I leave the non-AFM lifter cover in place & have nothing to plug the 5 pin AFM solenoid connector into, will I get a MIL? i currently get 8 mpg with the vortec 350 and a 4l60, I have a 99 Sub k1500 that i get 16 to 18 hwy loaded lightly, I get about 14 on my 95 Tahoe 2 door with 5.7 and 4l60. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. 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 Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? 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. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! lol. There is no way cylinder deactivation and the resulting temperate decrease, with sudden piston heat expansion when all cylinders are engaged, can't have undo wear and tear on the rings, valves, piston and bore. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. When cruising on the freeway (for example) in 4 cylinder mode and jumping on the throttle to pass or get out in the fast lane, there is CONSIDERABLE and annoying and dangerous lag, like 3 seconds, and this is a problem. []. This new lawsuit is essentially identical to the previous. 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. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. The car runs great apart from the shuddering at those speeds. Once the failure has occurred, the AFM shut off methods other than that probably wont work. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. The result is improved combustion chamber pressure as the piston approaches top . One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. Since no air can get in or out, four cylinders provide no power. The motor I pulled was a 2007 LY5 with about 77k on it. If a shop pulled a DTC code P0300 and found AFM to be the issue, it may not be too late to try the disabler. Brian, thank you for the quick response. I may just do that Vic. Most will want to get rid of the AFM immediately. Dont drive it if you have a dead cylinder due to afm failure. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. Where can I buy a bolt to replace this relief valve ?? Given maximum engine power is not required during the majority of everyday driving, AFM works to deactivate engine cylinders when they are not needed, such as when cruising on the highway, thus. Still have no power. 2 15 with 5.3 Sierras both with 100k and Open to suggestions about best course of action. My fear now is not will it happen but when! Not sure which direction to go from here. Why this happens is a more . I am confused about the plug in disabler. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. Really could use some pointers. 2 15 with 5.3 Sierras both with 100k and What the biggest reported problem with Chevy Silverados? It has AMF. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. Every one of these engine will have a lifter fail, this is a travesty! [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. 8000 grand for the repair mine was 1,700.00 to repair, I had a 2004 small block v8(4.8) 331,000 miles on the truck,it was the usual on the maintenance front axles,etc. I couldnt agree with you less, yet I respect your opinions. .or something similar . Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. Also, it is the easiest way [], [] for the 2010 Chevy Camaro SSis also a Gen IV 6.2L aluminum-block V8, but with the addition of Active Fuel Management and Variable Valve Timing. They are taller and have special oil holes. hi brian when you replace the lifters do you have to change the guides also? [], [] way. But the problem at that time was the computer technology. Last GM Ill ever buy unless its got a diesel. Dont want to make a move on a new truck or jump to a 2500 yet. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. 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. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. Seafoam with syn oil change only fixed for a week. So now at 168 thousand miles it still runs good but gets bad gass mileage. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. No clue what to do. I ran 0W-20 no more the 5000 miles between changes. I still get a P0336 code every once in a while but still good to drive around town. Covers me to 100K. Wow, thanks for the wisdom,, i checked my VIN Code (position #8, M=LH6) and my 2005 Saab 9-7x does have the LH6 motor with iron block, Are you sure its only 2007 & newer motors? But after reading this thread, Im a little concerned about the long-term reliability. [] Here is a guide on how to turn off AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Guide to disabling AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Here is an article on how to deactivate AFM. It was in the late 70s or early 80s and it was a POS, Your memory serves you pretty well I too have the same nightmares lol. Required fields are marked *. I have no other engine problems and Id like to fix the issue. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. Thanks for your help. I just took a long trip and it used 1.5 quarts of oil. 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). Thank you. The trucks are only supposed to use two four. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. Battery was unplugged for a week.. Im always sorry to hear when people run into issues like these. Install ls3 valley cover. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. There are so many more oil passages on engines these days. Yes, always change all the lifters at once. All Gen IV engine blocks haveAFMtowers and oil passages cast in. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). The detergent. 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?
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