I am trying to find out of this is true. How long did it take? Really could use some pointers. It only has about 9k miles on it. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. All Gen IV engine blocks haveAFMtowers and oil passages cast in. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . 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? Can you tell me what needs to be done with the VVT? Every one of these engine will have a lifter fail, this is a travesty! So I did the job one more time. I also notice that it doesnt go into V4 when it is cold. Put everything back together proper torque, gakets, valve seals, etc. I will keep reading and take notes. They took the engine down today found so much damage inside they ordered a new engine from Detroit. Here's what you need to know: 1. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? It came back on last Wednesday starting with a flash. Hi Brian, hi brian when you replace the lifters do you have to change the guides also? Is there any potential down-side to doing this in other words, might this do more harm than good? According to some experts, switching to cylinder deactivation reduces the emissions high somewhere between 4 and 10%, which is a huge percentage of saving the air from pollution. $8500.00 fix. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? Ever since that which was Feb/March 2020 i get a intermittent rattle does not do it all the time and I am not getting any codes i.e. GM get a clue! It is replaceable.. just remove oil pan and it will be on top at the filter. My 5.3 is. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. The engine had 200K miles. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. I loved this rtuck until this happened!! I love the car so far. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. He unstuck it and I took it for a drive and same thing happened. Double digit MPGs in my 98 K1500 would be a dream lmao. It has the orings in place, that seals the towers. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. Would never take it on a long trip. Required fields are marked *. Cylinder misfires (most common sign) Rough idling, poor acceleration, loss of power Check engine light with engine misfire codes Air-to-fuel ratios are either running rich or lean The easiest way to tell that you have an injector problem is through the check engine light and engine codes for misfires. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. Yes a poor design but a flaw ? I have no other engine problems and Id like to fix the issue. stalled in a certain way a warning wouldn be a bad idea. I wear hearing aids, but I thought I heard more engine noises, but after checking the gas cap, the light went out for a week. I have an 07 Silverado 1500 ltz. Cant believe they havent fixed this in a decade. 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. do you fill to capacity anyways???? Loved the looks and interior and thought a I got a great deal at $6k even. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. I got a 09 Chevy Ive had the 1 go out then the 7 about 2 weeks apart if I known what I know now I wouldve changed them all at once but now I have a misfire on cyl 4 but it came back in why are these lifters going out one at a time like this the 1st two that went out I was coming off the interstate an stabiltrack came on now the 4 misfired twice both times pullling out my driveway. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. It has has 9000 miles and no lifter or other issues or codes so far. 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). Not sure which direction to go from here. I have no clue what to do now. Never did strand me on the side of the road way. If you dont have VVT, you could use part number NAL-12561721 (LQ9) along with a 4-pole 3-bolt 2005 Corvette cam sprocket p/n NAL-12586481 to make it compatible with your ECM. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. The engine will switch to operating on fewer cylinders when cruising at a constant speed. Just one. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? I have 4 GMCs in my driveway right now only one with AFM its always popping DTCs, 06 Yukon (not AFM)never had a light in 12 years! You were lucky that it worked. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. When I first bought my newer truck with fuel management, the GM tech at the dealership told me; if I wanted the engine to live a long life keep the RPMs below 4500. She started to have the lifter problem again after 60,000 miles more. the extra oil isnt needed. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . 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. If you are using VVT, you could use the NAL-12612273 (L92) cam. No movement on the rocker arms. I hate it. What makes you think it was a design flaw ? Hi. Engine starts but is throwing a misfire on cyls 4,7. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. Having a hard time finding one .. They may be able to find some of those missing ponies. I am hoping this does the trick. Todays computers are faster so it does work. Replaced all lifters on passenger side as well as pushrods for even wear. IMHO . Have a lifter problem on my 2010 5.3 Silverado. You will get codes thrown if the afm is physically removed without telling the ECM you did so. If I put the Range module on, is that all I need to do, both now and long term? Brian, I have the same question as Scott. I have a 2007 Gmc Envoy Denali with LH6 cant find a good LH6 engine but I found a 2011 LC9 engine w 52000 miles will everything plug up or what am I getting into? another common cause for low OP is the oil pick up tube O ring. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. I have a 2013 1500 with the LC9. Only running on drivers side cylinders. Still have no power. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . I have a 2014 Silverado with a 5-3. Help appreciated. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Thanks for the advice Brian! Basically rebuilt most of the engine while in the vehicle. Install ls3 valley cover. My 2002 I had over 298K on it with no engine related issues. I got the AMF disabler anyway and so far so good. Id wait until the warranty expires then disable. The LFA was upgraded with AFM and [], [] improvement over AFM, DFM has 17 different cylinder firing patterns and switches seamlessly between them to provide just []. This new lawsuit is essentially identical to the previous. Love the truck so far. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? There are 5.3 cylinder deactivation problems that can occur. Very confusing stuff out there. It uses a M14 x 1.5 thread plug like Dorman 65217. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. She had driven it for a couple of months that way. She drove it for another 35,000 and it went out again. A 17 with 5.3. I will be installing the AFM deactivator tonight when I get hoe. 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. Its Chrysler and Ford. I have a 2011 GMC with over 162,000 miles on it and it runs great! I am confused about the plug in disabler. 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. Yeh truck has 5237 miles on it Driver reported this occurred suddenly while driving down the highway. What the biggest reported problem with Chevy Silverados? The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM 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. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. Im confused from the write up about the plug in. I just bought a 2015 5 3 17000 miles I was thinking about eliminating the 4-cylinder if I delete it with just the programmer will it hurt my motor? I have a 2011 GMC Sierra 1500 with the 5.3. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. Call chevy.They should being paying most of that. Changing the sensor didnt help. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. If someone didnt want to spend gas buy a Toyota. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. I sold them when they were new. Take a look at what bmw did in its R1250 bike. We believe this confirmed that the AFM has never been operating in this vehicle. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. This system was originally used in early 1980s Cadillacs. 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. how many miles do you have on your engine? If you installed a performance cam intended for a car, it may be bleeding off some low end compression. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). Covers me to 100K. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. 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. When you eliminate the AFM system, the extra oil is no longer needed. I am having that done today on my 08 Suburban and its only costing me $225. He stated if I continued to exceed 4500 RPM it would blow the lifters out. After reading these forums Im a little concerned about my decision to stay with GM. 1981 Cadillac V 864. NOT GOOD!! has 92,000 miles and was just told I have cam and lifter failure. The problem:. Its got a hundred forty-five thousand miles on it. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. It could be the filter screen under the oil sending unit. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? 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 result is improved combustion chamber pressure as the piston approaches top . It does seem that when they start goingthey go quickly. 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? If the lifter actually fails so that the mechanism wont release, it wont work. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. The collapsed lifters will not engage the pushrods and both valves remain closed. 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. 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 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. Thats a tough call, if the warranty will cover itId let it run out. 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??? I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Im curious as to how much tran fluid you put in? 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. The Jury is still out on the Gen. 5s but the warranty could be an issue. Its not GMs choice to use AFM. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. yep, you are 100% Right, I called a local saab shop and they filled me in, in 2005 the trailblazer and clones have DOD (displacement on demand), My next issue is getting extra ignition keys on the cheap. Remembered that after I bought my Tahoe. 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. 50,000 miles. [], I have a 2012 Silverado Z71 bought new. Told her that it would not last and that she needed to find a different way to get around. 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. Are there errors or something only the dealer can clear? Chris, when you did your delete, did you also change the cam at the same time? This lowers the cost of building it [], [] aluminum block engine. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. That inherently less smooth operation requires additional NVH dampening. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. He used seafoam and changed to synthetic oil. Last GM Ill ever buy unless its got a diesel. 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?? in your opinion will this work, i really dont see any reason it wouldnt. 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). Will the plug in deactivater fix the oil consumption or will it cause more consumption? Was a disaster then but a profitable disaster. Number 7 cylinder lifters stops moving when truck starts. I recently bought a 2018 Silverado 5.3L with AFM. I didnt have lifters fail, I had the 4 cylinders 1,4,6,7 have such blow by that my choice was a valve and piston job or a new motor. Found that all passenger side cylinders are not firing. How about if they just let us have a manual transmission agains for fuel mileage? The Definitive Guide to LS Engine Specs and LS Engine Upgrades, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance - OnAllCylinders, LS Engine Bore & Stroke Chart - OnAllCylinders, http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc, Range Active Fuel Management Disable Device, LS9 6.2L Engine Upgrade Guide: Expert Advice for LS9 Mods to Maximize Performance - OnAllCylinders, LMG 5.3L Engine Upgrade Guide: Expert Advice for LMG Mods to Maximize Performance - OnAllCylinders, L59 5.3L Engine Upgrade Guide: Expert Advice for L59 Mods to Maximize Performance - OnAllCylinders, L76 Car Engine Upgrade Guide: Expert Advice for L76 Car Engine Mods to Maximize Performance - OnAllCylinders, LH8 5.3L Engine Upgrade Guide: Expert Advice for L20 Engine Mods to Maximize Performance - OnAllCylinders, LH6 5.3L Engine Upgrade Guide: Expert Advice for LH6 Engine Mods to Maximize Performance - OnAllCylinders, LFA 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More - OnAllCylinders, LFA 6.0L Engine Upgrade Guide: Expert Advice for LFA Engine Mods to Maximize Performance - OnAllCylinders, LZ1 6.0L Engine Upgrade Guide: Expert Advice for LZ1 Engine Mods to Maximize Performance - OnAllCylinders, What the New LT2 Mid-Engine Corvette Reveals About the Future of GM LT Engines, All the Torques: How Summit Pro LS Truck Camshafts Help Truck Owners Maximize Performance, LMF 5.3L Engine Upgrade Guide: Expert Advice for LMF Mods to Maximize Performance - OnAllCylinders, L98 6.0L Engine Upgrade Guide: Expert Advice for L98 Mods to Maximize Performance, LQ4/LQ9 Engine Upgrade Guide: Expert Advice for LQ4 & LQ9 Mods to Maximize Performance - OnAllCylinders, Range AFM Disabler Reviews | Range Technology AFM Disabler 2019, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance, LM7 5.3L Engine Upgrade Guide: Expert Advice for LM7 Mods to Maximize Performance, LS4 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L76 6.0L Car Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L96 6.0L Engine Upgrade Guide: Expert Advice for L96 Mods to Maximize Performance, LC9 5.3L Engine Upgrade Guide: Expert Advice for LC9 Mods to Maximize Performance, LH6 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, LZ1 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, Chevy 4.3L Vortec Common Engine Problems - Vortec 4300 V6, https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-…, The 5 Most Common Chevy EcoTec3 5.3L Engine Problems, Chevy 6.0L Vortec Engine Problems - Common Vortec 6000 Problems, The 4 Most Common Chevy EcoTec3 6.2L Engine Problems, Gen 3 vs. Gen 4 LS Engines: How to ID Them (Video), Ask Away with Jeff Smith: Upgrades to GM LS 6.0L 4x4, LM4 5.3L Engine Upgrade Guide: Expert Advice for LM4 Mods to Maximize Performance, L33 5.3L Engine Upgrade Guide: Expert Advice for L33 Mods to Maximize Performance, Mailbag: Choosing an Engine Management System for an LS-Swapped '82 Olds Cutlass. Is this an issue only with GM SUVs and trucks, or does it include cars too? I quites down to nothing after running for about a minute. Just shut AFM off. Love the truck. I would rather stay a V8 full time than deal with AFM issues in the future. While it does still use the GM Active Fuel Management cylinder deactivation technology that caused a plethora of issues on the gen-four Vortec 5300 engines, it seems that GM has solved the issues related to excessive oil consumption. Some guys have been able to use a tool through the top with the cover off to get it to release. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . What type of ODBII gadget did you use? Fortunately, the old engine hadnt been shipped back to the remanufacturer. They lasted one year with big problems. They dont so any better than domestics on mpgs. []. I service plenty of these vehicles with AFM, and the ones I have to open up the engine for repair because of a failure doesnt surprise me anymore. Gary, [] 3 engines didnt have AFM (Active Fuel Management) or VVT (Variable Valve Timing), so you dont have the expense of an AFM or VVT delete []. Disable the afm. 1. I have a Yukon 116k it now needs its 3rd set of lifters and cam. Most of all, my concern is reliability. Given that, would you recommend buying one of the OBD-II devices to disable AFM? GM uses 3 different styles all are engine specific. Dont drive it if you have a dead cylinder due to afm failure. they are known to become plugged. Did not help. Wed recommend a call to our partners at Summit Racing. Because I want to. Also putting in a new transmission vs. rebuilding. 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? My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. Another option is to plug it entirely if the AFM is already removed. Just pulled it down in the garage there was no other damage , luckily. All Cylinders. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. So I researched and got an AFM disabler. My 5.3 has a vin code of O. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). Would it be fine to go ahead with the AFM Disabler? From what Ive read new and low mileage engines with no issues is ideal to do a afm delete, tune, or use of a disabler. The biggest problem is nobody changes their oil on time. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. The cost of just rings $4,000.00, [] Disable your Chevy AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] like front timing cover, knock sensor location, cylinder head style (cathedral ports), AFM (Active Fuel Management), and other components are key clues to which engine family youre looking []. When you drain the oil at three to four thousand miles its still clean. I recently bought a low mileage 2013 Silverado and the lifters collapsed. 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? It has AMF. Because its not just GM that have engine problems. 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. 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. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. Hopefully more is known by then. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. I wii be using this truck to haul a camper for full time RV living and am thinking of a tuner to shut off AFM and maximize performance and economy. Then changed the oil. I have 1999 5.3 Silverado that gets 19-20 miles to the gallon all the time this shit pile with dod only gets 14 miles to the gallon.

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