I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. However, the fuel savings are not always as much as expected. However, they are only functional on engines that usedAFM. We chickened out though and just bolted the AFM solenoid plate onto the used engine. He used seafoam and changed to synthetic oil. is it still working good since you have done that with the trans fluid? Yeh truck has 5237 miles on it . they are known to become plugged. 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. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. TheAFMsystem can be identified by its components. []. They should let us the better mileage. [], [] 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. i just bought a 2018 Silverado with the 5.3 The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. Was a disaster then but a profitable disaster. So I did the job one more time. 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 []. When you eliminate the AFM system, the extra oil is no longer needed. Fortunately, the old engine hadnt been shipped back to the remanufacturer. 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. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. whith a disabler. Brian, thank you for the quick response. It was well researched and tested back in the late seventies and eighties . It has 8,000 miles on it. Ketil, let us know what you find out. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. Looking forward to input from the forum, Thank you. It uses a M14 x 1.5 thread plug like Dorman 65217. What type of disabler did you go with? . 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? Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . Junk . In other words, the crankshaft and bearings were not visible. The engine was not Flex Fuel (E85) capable and did not use Variable Valve Timing (VVT) [], [] TheL76like its LS2 siblingis a 6.0L, Gen. 4, aluminum small block engine that was used both in GM cars and trucks. There are so many more oil passages on engines these days. 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. Plug the tuner into your GM vehicle's OBDII diagnostic port, and follow the instructions provided to update the engine control module's program The new program will make sure that AFM never engages. Wed recommend a call to our partners at Summit Racing. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. 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. Yes, always change all the lifters at once. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? the body is in great shape. Because its not just GM that have engine problems. I am hoping this does the trick. Cylinders two, three, and eight are all similar in cylinder deactivation. Most will want to get rid of the AFM immediately and VVT isnt for []. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? The result is improved combustion chamber pressure as the piston approaches top . A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. I have had some say that it is the valves and others say that it is the cats plugged. You cannot compare them to old 350s. I have a 2013 1500 with the LC9. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Welcome to socialism folks . Friend will send to me from Arizona. After reading these forums Im a little concerned about my decision to stay with GM. has 92,000 miles and was just told I have cam and lifter failure. I have a 2012 Chevy Avalanche. 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??? Replacing engine due to issues caused by AFM. All eight cylinders are now powering the engine. No clue what to do. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. I did noticed the oil consumption but it was rare that I would have to add oil. 190k on the motor always ran AMSOIL full synth since new. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. . I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. 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. Now the problems back, I have 180k miles on it now. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. We believe this confirmed that the AFM has never been operating in this vehicle. I ave noticed the point about excess oil spray. Or not because it is the cast iron block and not he aluminum block? No problems with any to this point. It also mentions a valve cover replacement with revised PCV valve design. Take a look at what bmw did in its R1250 bike. What makes you think it was a design flaw ? On one hand it has an aluminum block, which is nice. Everything was fine for two weeks, ow customer complains s it same noise it made as before. 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 []. You also need the disabler installed in your obd connector. 330-630-0240. More information can be found in the GM TSB bulletin number 10-06-01-008g. Thank you. I have 217,000+ on it and it never fails meever! Perhaps a flaw by design would be a more appropriate description . 2011 Chevy Avalanche LTZ. 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 have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. I just bought a 2018 Silverado. [] 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. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. 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. My 5.3 has a vin code of O. Any truth to that? 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". Would never take it on a long trip. 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. I always have done my oil changes on time, not sure about the people who owned it before me though. Looking to tear down myself. Should I wait until the warranty runs out, or will that be too late to stop possible damage? I had the same issue and had to have the AFM information deleted from the computer and the car tuned. The 2nd went with a conventional valvetrain. Some guys have been able to use a tool through the top with the cover off to get it to release. Fouls those plugs. Change your oil. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. 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. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. I have no other engine problems and Id like to fix the issue. Your email address will not be published. GM's Active Fuel Management (AFM) works under certain light load driving conditions to maximize fuel economy by deactivating 4 of the engines 8 cylinders. I know a few guys with Tundras. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. misfire or anything. 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. If possible, will simply not using VVT provide a powerful,good running engine? [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. There are so many moving components in an engine these days as opposed to the past. With 40000 Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? I can literally drive from Seattle to Redding CA on one tank. Also putting in a new transmission vs. rebuilding. what deleter (if thats a real word) have you heard good things about. 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??? Will the plug in deactivater fix the oil consumption or will it cause more consumption? I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. I have a 2011 Chevy Tahoe with the 5.3 Gen 4 LS (VIN Code 0) and I bought a CAM motion DOD/AFM delete kit, 3 bolt drop in CAM Motion stage 2 camshaft, VVT delete kit and finally a Diablo Predator 2 Premium for GM programmer. . 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. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. Covers me to 100K. 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. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. 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. Since no air can get in or out, four cylinders provide no power. I still get a P0336 code every once in a while but still good to drive around town. Its ribbed with solenoids on the underside. Took the heads off again. I have only put about 600 miles on it and noticed that the oil was a bit low and am hoping that it was that way when I picked it up. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). Correct me if Im wrong- If such an item was available couldnt you then just replace the lifters in the 4 AFM cylinders and then just run a disabler or have your ECM/PCM reprogrammed to have AFM disabled permanently. Thank you for your time. She started to have the lifter problem again after 60,000 miles more. Their tech guys have seen it all and may have some thoughts on this as well. Ive only put a straight pipe exhaust, intake, and a boost controller on it. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. 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? Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Help appreciated. 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? Im praying that my RangeTech buys me a few years. 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? 2 15 with 5.3 Sierras both with 100k and 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 have an 2004 1500 Suburban 4WD that I am about to replace the motor in. changed oil , its all working now, but want to disable this sorry system. Have a lifter problem on my 2010 5.3 Silverado. Disable the afm. Glad I did. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. Hello. This lowers the cost of building it [], [] aluminum block engine. Dont drive it if you have a dead cylinder due to afm failure. So for all of you that continue to complain about how bad these things are. .IMHO . This update also saw the usage of cylinder deactivation technology or Active Fuel Management. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. It essentially turns your V8 engine into a V4 which saves fuel. 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. Required fields are marked *. Mine did at the exact same time. Did not help. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Then had to drive the truck back to Tampa from Cheifland Fl. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. They may be able to find some of those missing ponies. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? Regards, For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). 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). The wife however found this deal on an Envoy Denali . There is a good chance that some of the drivers side lifters decided to go. I recently took a long trip and it burned 1.5 quarts of oil. Dont want to make a move on a new truck or jump to a 2500 yet. 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. As we were installing the sensors prior to installation in the vehicle, we noticed that there was no fitting on the oil pan for the oil level sensor. Remembered that after I bought my Tahoe. The oil collapses the plunger inside the lifter. Getting ready to diy for $450. 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. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. Would it be fine to go ahead with the AFM Disabler? One the other hand, it came without AFM, VVT, or flex fuel capability. Yes a poor design but a flaw ? Every one of these engine will have a lifter fail, this is a travesty! I would appreciate any feedback. All ready done valve job . Thats a tough call, if the warranty will cover itId let it run out. [] they have a downside? They dont so any better than domestics on mpgs. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Not sure what else it can be. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. The lifter seems to recharge whenever the truck sits for some time. Better airflow reduces drag on the pistons and the associated pumping losses. 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. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. Traded it with 180K miles and did not experience any problems. Excess oil will be pushed out of the pressure relief valve into the oil pan. []. I have read synthetic isnt good for AFM lifters. Ive read at many websites that the GMCs envoys, Chevys and saabs did start to come with AFM in 2005 with the LH6 motor,It says here it started in 2006 on the saabs, then the pick-ups got AFM in 2007. A 14 gmc 5.3 Sierra 85000 miles Had similar problems under warranty, no telling what they rigged me up with at the dealer. I noticed this discussion mainly addresses Chevy Silverados and other trucks? thank You so much! I ran 0W-20 no more the 5000 miles between changes. any help? Shame this happened. Just pulled it down in the garage there was no other damage , luckily. It depends on the failure mode of the lifter however, certainly worth a try. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. AFM sucks Im paying for a truck that has broke down twice replace the cam and lifters and now its broke down again 105000 miles never heard of that in a 350 Chevrolet. 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. When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. GM uses 3 different styles all are engine specific. You could also have tried that if the trans oil didnt work. will feel like a jerk asking the clerk at lowes to cut them again. It will show up as a misfire code in a cylinders 1,4,6, or 7. I would rather stay a V8 full time than deal with AFM issues in the future. If I were to put a 2006 5.3L in a 2007 Avalanche and buy the unit to plug into my OBD2 port would it work? Chevrolet 5.3 Engine Issues and Recommendations The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. So now at 168 thousand miles it still runs good but gets bad gass mileage. Dod is the biggest failure sence the 8-6-4 caddie in 1981. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. Once the lifter has been damaged, the cam is probably also damaged. Engines with AFM use a high-volume oil pump. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. 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? Any guidance would surely be appreciated. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). "The idea behind cylinder deactivation is that when you're cruising down the freeway and there's low load, the engine can turn off half the cylinders and in theory burn half as much gas. Number 7 cylinder lifters stops moving when truck starts. 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. Only running on drivers side cylinders. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . Really could use some pointers. Because your Saab is mechanically similar to the Trailblazer, wed suggest that you are correct and no changes need to be made to the relief valve. Sylinder one lost compression on my 09 5,3. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. Its Chrysler and Ford. It also has an electrical connector on the back. In the mean-time I found that you can keep the engine from going into 4 cyl mode by using the manual shift (if so equipped) and keeping it out of 6th gear. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. New plugs and wires. It could be the filter screen under the oil sending unit. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. 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. Chris, when you did your delete, did you also change the cam at the same time? Just one. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. I plan on getting a tuner to disable the AFM. Cylinder Deactivation to the Rescue. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. Im crossing my fingers it does the trick! Send response to tkrieg@cox.net. The dealer in Rockhill, SC when asked only said they had not had a problem. the extra oil isnt needed. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? Here are a few of the issues that you'll want to keep on your radar if you drive a 2017 Chevy or GMC vehicle with a 5.3L engine in it. 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?? At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. . If the 4th cylinder lifter has failed, would driving it damage the engine? There is a chance the cam lobe was stressed and started to deteriorate. Basically rebuilt most of the engine while in the vehicle. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. That inherently less smooth operation requires additional NVH dampening. It seems this tough engine has everything incorporated into it. Billy, there is some interesting trivia here on the L92. Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. Hi Brian,

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