The result is improved combustion chamber pressure as the piston approaches top . 2011 Chevy Avalanche LTZ. I will keep reading and take notes. I already ordered the parts to replace myself and remove the code. 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. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. Corvette that does employ AFM. All ready done valve job . I have a 2014 Silverado with a 5-3. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. 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. 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. misfire or anything. Seafoam with syn oil change only fixed for a week. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. []. [] engines is that when VVT (variable valve timing) appeared and was later followed by AFM (which is Active Fuel Management, when the engine deletes four cylinders under light load) both of these packages drastically affect []. There are a few potential causes for Chevy cylinder deactivation problems, including oil consumption problems, harmful to the environment, sludge issues, and lower cylinder temperatures. Battery was unplugged for a week.. How stupid do you have to be to whine like a welfare check cashing idiot when there are literally 3 or 4 different ways to totally disable AFM. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. the body is in great shape. All the time. Thanks. Loved the looks and interior and thought a I got a great deal at $6k even. Engine starts but is throwing a misfire on cyls 4,7. You also need the disabler installed in your obd connector. Chevrolet Silverado 2014-Present: Common Problems NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades. I would rather stay a V8 full time than deal with AFM issues in the future. How is that an improvement. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. GM 6.2 Active Fuel Management Problems: What They Are and How - CarAraC If the lifter actually fails so that the mechanism wont release, it wont work. 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. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. Im crossing my fingers it does the trick! The 1 Big Problem People Are Having With the Chevy Silverado - MotorBiscuit GM offers the following diagnostic steps in determining if this is the problem. 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! My 2002 I had over 298K on it with no engine related issues. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. What the biggest reported problem with Chevy Silverados? This lowers the cost of building it [], [] aluminum block engine. Seems like the AFM disabler device is working for a number of people including myself as the 5.3l AFM engine has inherent design faults. Looking forward to input from the forum, Thank you. I read something the other day which I found to be funny. Had nothing but trouble out of it. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? I recently bought a low mileage 2013 Silverado and the lifters collapsed. I had a 2007 Yukon XL 5.3 with the AFM. 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? RANGE TECNOLOGY.COM. It essentially turns your V8 engine into a V4 which saves fuel. 1981 Cadillac V 864. HP tuners is not for someone like me that doesnt know how to use it and from what I read neither the range nor diablo plug and play device will work since the buicks pcm files are different than all other GM vehicles that came with afm because it was tuned in house at gms performance division. I noticed this discussion mainly addresses Chevy Silverados and other trucks? Is Your 5.3L V8 Engine Eating Up Too Much Oil? We - GM Parts Online The computers had not evolved enough to control the sytem. Runs better than new now and no more oil consumpsion!! Friend will send to me from Arizona. The collapsed lifters will not engage the pushrods and both valves remain closed. I have a 2012 Chevy Avalanche. How did your turn out? I would just have the AFM disabled (tuned out) then. what deleter (if thats a real word) have you heard good things about. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . IMHO . 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 . A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . Dale, I have a 08 Tahoe thats doing the same thing.Any info you have on this would be appreciated, [] Do they have a downside? Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. 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. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. Problems After AFM Delete And How to Solve Them? - Tools Bible I told her to never pull the gadget out. If you left the original cam in, the AFM cylinders will be down about 25 lbs. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. I am considering the same. AFMlifters have a history of failing and oil consumption can be a problem. Accept i only have 60K on my truck and it hasnt recovered. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). I have a Yukon 116k it now needs its 3rd set of lifters and cam. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. If I put the Range module on, is that all I need to do, both now and long term? When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. 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. Traded it with 180K miles and did not experience any problems. GM Escalates Cylinder Deactivation With Dynamic Fuel - EngineLabs GM Lifter Recall Needed, Says Class Action Lawsuit Active Fuel Management About Gone From 2022 Silverado Lineup - GM Authority Thats a tough call, if the warranty will cover itId let it run out. Its got a hundred forty-five thousand miles on it. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Some drivers want V8 power under their foot at all times. Truck has an active P0300 code and runs very rough. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. Change your oil. 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. Brian, we have a 2007 Yukon Denali in our shop with a 6.2L v-8 that has suffered a lifter failure with camshaft damage. GM uses 3 different styles all are engine specific. You may want to update your post. [] 5.3L engines start in the $600-$1,000 range and go up to a little more than $2,000 for the 6.0L and 6.2L engines. Because I want to. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. 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. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. I call it active obama fuel management .A scam . Hopefully more is known by then. 4,7 plugs foul runs rough at idle. This allows the engine to run in V8 mode. Regards, We believe this confirmed that the AFM has never been operating in this vehicle. I ran 0W-20 on more the 5000 miles between changes. Better airflow reduces drag on the pistons and the associated pumping losses. I went with the new motor for the warranty. Id wait until the warranty expires then disable. With 40000 Changing the sensor didnt help. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. thank You so much! If thats the case, Summit Racing has dedicated truck cams that will increase power through the rangebottom to topbut the meat of it is in the mid-range where your engine spends the most time. 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. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. . All Gen IV engine blocks haveAFMtowers and oil passages cast in. Thanks for the advice Brian! TheAFMsystem can be identified by its components. It has plenty of oil pressure and I put all new lifters in it. Just one or two. We chickened out though and just bolted the AFM solenoid plate onto the used engine. It actavated the lifter? Should I buy one to disable the V4 mode? Your email address will not be published. As the problem gets worse, youll hear a lifter tick and eventually you may see clearance between the pushrod and the rocker which will quickly destroy the cam. any help? Im a little confused on the problems too, Im reading that the 2007 pick-ups with 5.3 really had bad oil consumption and plug fouling problems, but is the 2005 5.3 that came in the trailblazers, envoys, and sabb 9-7s the exact same design as these pick-ups and prone to the same failures? Ive been reading, with disgust and concern of the lifter/cam situation. Any thoughts or suggestions would be appreciated. Clean oil is crucial. Very expensive repair too! Bought an 07 GMC Yukon 5.3 with the AFM, 87k. If you ignore it and keep driving, odds are you will destroy the cam as well. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. Next day, fired it up to take the the junk yard and it ran great. Hi Mike, the metal shield you noticed is probably the windage tray. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? Would you get enough power to drive at freeway speeds? This is my second Avalanche and I never had any issues with either of them. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. It's been an issue for a while but I've been getting past it by turning the key only to the off position instead of all the way back to "lock". I had the same issue and had to have the AFM information deleted from the computer and the car tuned. 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? I just bought a 2018 Silverado. Just shut AFM off. Oil 0w or 5w -20 Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? How to Fix GM's Cylinder Deactivation Problems 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. Found that all passenger side cylinders are not firing. It came back on last Wednesday starting with a flash. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. The write up confuses me. 190k on the motor always ran AMSOIL full synth since new. I will be installing the AFM deactivator tonight when I get hoe. Once the failure has occurred, the AFM shut off methods other than that probably wont work. Its Chrysler and Ford. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. He used seafoam and changed to synthetic oil. This reduces expense when you build it [], [] intake, and a cable-driven throttle body, plus Im also installing Trick Flows VVT and AFM delete kits. Is this due to the AFM being shut off? Hopefully he can free up the stuck/collapsed lifter. There are 5.3 cylinder deactivation problems that can occur. It only has about 9k miles on it. I guess they also went to aluminum blocks in 2007, not sure if that has anything to do with this issues thanks for the advice! An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. stalled in a certain way a warning wouldn be a bad idea. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. It works . If so what would the vin code be? I would say maybe 5% of my customers keep up on their oil changes. Teflon coatings does not last. []. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. It has AMF. I have the towing package on my 13 Tahoe LTZ. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. It was well researched and tested back in the late seventies and eighties . Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . Ive heard the Brand name Range thrown around in other forums, This is how mine started outthen 6 months later on the highway the service stabilitrak light and flashing engine light came on. It is currently at the dealer having a new long block installed under warranty. (Non-AFM engines have a smooth cover.). In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. 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. There are so many moving components in an engine these days as opposed to the past. If you think GM pioneered cylinder deactivation, guess again .or something similar . 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. The older truck gets 19 mpg the newer truck with fuel management gets 14. 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. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy Only wish Id did my homework, nothing but issues, from 14,000 miles it starts this motor noise,as if lifters at cold starts, let set up for 8 hrs same noise, this noise is on the right side of engine, it lasts 5 seconds but never heard this until we had this cold spell in the state low temperatures or it was just time for this to start? so the trans fluid worked for you then? 2019 Chevy, GMC Trucks Get Smarter Cylinder Deactivation - Car and Driver But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. If you just crack it without it starting it moves all the time . 2017 5.3 Liter Chevy Engine Problems: Be Aware of These 4 Issues! 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 []. Why this happens is a more . But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. I have a 12 wit 4.8 Silverado 75000 miles I havent has any lifter or cam issues. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. 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? No problems with any to this point. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. PDF GM LS AFM Deactivation Lifter Issues - Melling i have a 2007 suburban 6.0 and the number 4 intake lifter took a dive.i have already started to disassemble the engine as i plan on replacing all the lifters and reassemble the engine as i never had any other problems with it. Please report back if you have any issues, but I think you are in good shape. Don't even get me started on the shortened life of the cooling, starting and charging systems. Looking to tear down myself. Once the lifter has been damaged, the cam is probably also damaged. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? The engine will switch to operating on fewer cylinders when cruising at a constant speed. I have already dropped a lot of money on this truck (08 suburban). 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. Thank you. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. 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. The motor I pulled was a 2007 LY5 with about 77k on it. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Removing ignition lock cylinder when it won't turn at all 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 have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . 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. .IMHO . The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. 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. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. 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. That might show up if you cut the filter and looked for debris in the pleats. In four-cylinder mode, they act like air springs and allow for smooth operation. I plan on getting a tuner to disable the AFM. They layed over night in engine oil before instalation. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. It could be the filter screen under the oil sending unit. You will get codes thrown if the afm is physically removed without telling the ECM you did so. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Does cylinder deactivation affect engine life? - Quora please respond with your opinion. I had one fail and it chattered the cam to the point that I had to Install a new cam.