.or something similar . Basically rebuilt most of the engine while in the vehicle. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. Cylinder Deactivation to the Rescue. Welcome to socialism folks . If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? 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. misfire or anything. Unfortunately, I found out about the lifters too late. Its not possible to install them wrong? Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors.It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy.Estimated performance on EPA tests shows a 5.5-7.5% improvement in fuel economy. I am hoping this does the trick. Is this the shield you referred to in a past post? I am a long time GM fan but after reading how they messed up the 5.3 ( I had a fantastic 2003 Z72 off road) Ill look else ware for my next vehicle. Oil 0w or 5w -20 But after reading this thread, Im a little concerned about the long-term reliability. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. My question on a 2007 Chevy Tahoe 5.3 AFM Brian, I have the same question as Scott. You can monitor the oil level on your dipstick for 3,000 miles to determine if the deflector or plug would be needed, but chances are you wont based on the TSB. CAM motion says no just have to disable the AFM and VVT with a stock tune as the camshaft is not an aggressive camshaft but a drop in. Just recently, GM announced a temporary closure. The engine is running on only four cylinders. Teflon coatings does not last. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. The Tundra fares better but the frame has the rigidity of wet spaghetti and the 5.7 has had problems with VVT solenoids and the plastic timing chain tensioners. Chevrolet Silverado 2014-Present: Common Problems 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 I already ordered the parts to replace myself and remove the code. They lasted one year with big problems. Would you get enough power to drive at freeway speeds? As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. I also notice that it doesnt go into V4 when it is cold. It also mentions a valve cover replacement with revised PCV valve design. All ready done valve job . The write up confuses me. Love the truck so far. How do you know if the lifter has failed? This is what I keep telling people. I can tell you for the past 2 years I changed out my LC9 5.3L fully synthetic oil every 3,000, even though Mobile Oil claims 10,000 miles or more. The problem:. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. also in the pan is another AFM oil filter near the external engine oil filter. In other words, the crankshaft and bearings were not visible. We believe this confirmed that the AFM has never been operating in this vehicle. 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! any help? I have read synthetic isnt good for AFM lifters. The 1 Big Problem People Are Having With the Chevy Silverado - MotorBiscuit I loved this rtuck until this happened!! Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. It uses a M14 x 1.5 thread plug like Dorman 65217. It also has an electrical connector on the back. 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. It will show up as a misfire code in a cylinders 1,4,6, or 7. AFM/DFM Disabler - Range Technology it is the regulator guy! Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. [], I have a 2012 Silverado Z71 bought new. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. I dont know where to being to look for the problem. Still have no power. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. I would appreciate it if you let me know how you make out. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. I dont plan on installing the delete kit at this time. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. (Bought car 1 day before lifter died!) It has the orings in place, that seals the towers. Is this an issue only with GM SUVs and trucks, or does it include cars too? Dave, I also have a 2008 LTZ avalanche with 106,000 I have the exact same symptoms at this point I just want to sell it will the disabler help remove the check engine light wont pass inspection with light on thanks for your help Chris. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. Thanks. Very confusing stuff out there. The lifter seems to recharge whenever the truck sits for some time. I just bought a 2018 Silverado. GM get a clue! How to Fix GM's Cylinder Deactivation Problems A 17 with 5.3. No it runs fine on sylinder one but not on 6 or 7!!! GM offers the following diagnostic steps in determining if this is the problem. 2 15 with 5.3 Sierras both with 100k and Your 1981 caddy was your fmu I got glue inside of it and it stuck the potentiometer for stochiometric if you get a new fmu or you pick the glue out of the potentiometer you can set it to stoichiometric and get a lot better fuel mileage as far as your truck why dont you look at the intake manifold I got a crack or a vacuum leak somewhere for gas mileage thank you truck service, Near 1981 its your fmu it has glue inside the potentiometer you have to either RNR it for a new one or pick the glue out of the potentiometer for stochial magic is the only variable resistor inside that you can turn with a screwdriver once you get the glue out of it itll read still kill metric just be careful and then you can set it properly with your own meter on your monitoring your O2 sensor and then on your Silverado thingy your 5.3 just check the intake manifold for lakes Ill get you a better gas mileage if you dont have any intake cuz theyre plastic and they crack and stuff like that other than that yeah thats it, Larry Jenkins, I have a 17 GMC Sierra 6.2 SLT, I got 25 to 27mpg regularly with 93 gas and cylinder deactivation. I have seen more internal engine failures in the last 5 years or so than I have in the first 15 years in the business. Fortunately, the old engine hadnt been shipped back to the remanufacturer. I could just transfer over the AFM lifter cover, but it is really nasty on the bottom side & I do not want to risk damaging this replacement engine if it is loaded with debris from the lifter & camshaft failure. NOTE:If you were in a situation where youve installed the AFM delete kit, but dont have access to a programmera disabler can still be a viable option. Did not help. Sylinder one lost compression on my 09 5,3. Excess oil will be pushed out of the pressure relief valve into the oil pan. What type of disabler did you go with? I have the towing package on my 13 Tahoe LTZ. 190k on the motor always ran AMSOIL full synth since new. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. []. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. Not sure what else it can be. 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. It depends on the failure mode of the lifter however, certainly worth a try. Problems After AFM Delete And How to Solve Them? - Tools Bible Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. This happened on a camping trip with my kids last friday night. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Can they be faulty? I had a 2007 Yukon XL 5.3 with the AFM. I have been assuming this is just a slow to pump-up lifter or lifters. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. Put an S&B cold air intake on last week with huge oiled filter and it made a big improvement in throttle response and it appears possibly a slight improvement in mileage. chevrolet - How does cylinder deactivation work? - Motor Vehicle 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. please respond with your opinion. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. []. It replaces the AFM components with standard parts. Thanks. I love the car so far. I had one fail and it chattered the cam to the point that I had to Install a new cam. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . Put everything back together proper torque, gakets, valve seals, etc. 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. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . This allows the engine to run in V8 mode. If you swapped in a LS9 cam, you will find it makes good power at the very top, but its actually down from 5,000 rpm and lower where the truck spends the majority of its time. If you left the original cam in, the AFM cylinders will be down about 25 lbs. Delete the AFM, buy a tuner/chip, take it to a performance place and get an actual tune done that fixes it, replace the AFM lifters with non AFM type, change other engine components with thisetc..etc..etc??? Remembered that after I bought my Tahoe. I can literally drive from Seattle to Redding CA on one tank. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. Last GM Ill ever buy unless its got a diesel. I still get a P0336 code every once in a while but still good to drive around town. Weve written some articles on the various Vortec engine upgrade paths, such as this one on LQ4 and LQ9it discusses some of the better options for choosing a cam intended for use in a truck. Runs better than new now and no more oil consumpsion!! Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. is it still working good since you have done that with the trans fluid? Truck has an active P0300 code and runs very rough. There is a note in the TSB that states the bulletin doesnt apply to the LH6 used in the Rainier, Trailblazer, and Envoy due to a different design oil pan and AFM relief valve. I am trying to find out of this is true. I recently bought a 2018 Silverado 5.3L with AFM. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? TheAFMcylinders are opposite of one another in the firing order. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. Cylinder Deactivation (Active Fuel Management) General Motors Active Fuel Management engine control system has the ability, under certain light load driving conditions, to provide maximum fuel economy by deactivating 4 of the engines 8 cylinders. Then changed the oil. You could also have tried that if the trans oil didnt work. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. There are two ways to disable or delete Active Fuel Management on your GM or Chevy Gen IV LS or LS-based Vortec engineone is to install an AFM Disabler, and the second is to install an AFM Delete Kit. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. I would appreciate any feedback. 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. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. I am leaning heavily on installing the AFM disabler. Given that, would you recommend buying one of the OBD-II devices to disable AFM? I recently bought a low mileage 2013 Silverado and the lifters collapsed. Just shut AFM off. 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. Once I get it back, could I install the Disabler safely. I may just do that Vic. 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. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. Your email address will not be published. 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). Engine starts but is throwing a misfire on cyls 4,7. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. Chevy 5.3 Engine Problems Are They That Long-Lasting? - Motor Verso PDF Service Bulletin Bulletin No.: 20-NA-038 Date: March, 2020 The biggest problem is nobody changes their oil on time. If I had wanted a 4 banger I would have bought one. Toyota will be my next truck unless GM owns up and makes wright with consumers. Id wait until the warranty expires then disable. Would doing the disabler option once I get it back be the right one? I have a 2012 Chevy Avalanche. But the problem at that time was the computer technology. Regarding the cylinder deactivation impact on fuel consumption . I speak from some experience. Traded it with 180K miles and did not experience any problems. It came back on last Wednesday starting with a flash. I contacted service manager in Gastonia, NC and he was kind enough to tell me the whole history of the problem.. EPA required better fuel mileage and less emissions and GM, Ford and Honda(V-6) came up with this failed AFM system. General Motors has issued a service update for 2021 model year full-size truck and SUV models that are being shipped to dealerships and may be affected by valve lifter problems. If you just crack it without it starting it moves all the time . I have a 2014 Chevy Z51 [w/dry sump oiling etc.] It essentially turns your V8 engine into a V4 which saves fuel. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? On June 4th you stated The vehicles affected were 2007 to Feb. 2011 AFM equipped engines (Aluminum or Iron block-L94, LZ1, L99, LC9, LH6, L76, LFA, LMG, and LY5) I am looking at purchasing a 2012 Tahoe with the LMG per the build sheet. Keith, were happy to help. There are so many moving components in an engine these days as opposed to the past. Mine did at the exact same time. Toyota has their own problems. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. Yeh truck has 5237 miles on it It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). Please report back if you have any issues, but I think you are in good shape. Some guys have been able to use a tool through the top with the cover off to get it to release. 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. This lowers the cost of building it [], [] aluminum block engine. Pushing forward. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. My daughters car had about 230,000 miles when she complained of the problem. Just pulled it down in the garage there was no other damage , luckily. do you fill to capacity anyways???? [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. 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. how many miles do you have on your engine? Drives way better for my mostly paved road driving. HELP, I have 2005 envoy that runs makes lifter noise then dies in about 30 seconds then I started it one day and it ran with little noise for 5 min started next day and it starts and dies again got heads off was told I could put ls 3 lifters in is that true or is there something else I could do thanks Duane. There is no light on my dash or anything that indicates the system is active or exists, so its very confusing, Im still not sure if my vehicle has it or not. I cant really tell from driving. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . Im servicing a 2011 Chevrolet 5.3 with AFM. Now Im here tring to figure out what to do. I noticed this discussion mainly addresses Chevy Silverados and other trucks? 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. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. Was thinking maybe I could trick the ruck into thinking the engine was not warmed up, however, this might cause some problems for other processes, such as mix ratio and timing. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Thank you. Didnt change exhaust nor tune so likely no change in power/torque. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . Get this, rebuild is only rings and maybe lifters. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. New plugs and wires. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. Friend will send to me from Arizona. I plan on getting a tuner to disable the AFM. []. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! My question is: do I install the electronic disabler on the new engine to avoid future issues? Take a look at what bmw did in its R1250 bike. You will get codes thrown if the afm is physically removed without telling the ECM you did so. 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. For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). thanks brian love the info Im thinking of buying a ford now, 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.But they arent so i will become a Ford man from now on, Have fun with that Ecobust motor & stretched timing chain . 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. I read something the other day which I found to be funny. I call it active obama fuel management .A scam . If buying a tuner/chip which works best for that truck/engine? changed oil , its all working now, but want to disable this sorry system. i just bought a 2018 Silverado with the 5.3 It is usually first noticed during highway driving. Fortunately I received a reducing in house shop hourly rate. Why would GM ever produce such problems with such little to gain. 2014 Chevy, GMC Pickups Recalled For Cylinder-Deactivation Issue Been driving with no issues but I did notice that the AFM disabler removed a P0449 code (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction) dont know if this is a coincidence or they are related??? Everything else looked good. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. What makes you think it was a design flaw ? When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. This is my project car and will be my drive (about 5000 miles a year).

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