But it also restricts passages that the oil runs through. 1. Still have no power. Pushing forward. Nine plaintiffs filed the General . I would. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. The wife however found this deal on an Envoy Denali . We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? The oil pump is high volume, but there are a lot of people that dont change it and rely on the pressure valve to keep the volume manageable. This system is the most effective way to disable AFM. Replacing engine due to issues caused by AFM. The engine had 200K miles. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. CHANGE YOUR OIL!!!!! I dont plan on installing the delete kit at this time. 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. 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. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. It seems to me that the high volume oil pump should not hopefully cause premature wear but if it is pushing more oil through the heads than I guess the valve stem seals have more work to do. 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. Thats not all bad because it saves the cost of an AFM delete kit. If you want to delete it entirely, its a M14 x 1.5 pipe plug or you could use the Improved Racing plug p/n IRP-814-M14-Kit. Is the Pressure relief valve replaceable? Some guys have been able to use a tool through the top with the cover off to get it to release. They should let us the better mileage. A 14 gmc 5.3 Sierra 85000 miles 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. My concern is if I leave the non-AFM lifter cover in place & have nothing to plug the 5 pin AFM solenoid connector into, will I get a MIL? Everything else looked good. Accept i only have 60K on my truck and it hasnt recovered. GM switched over to the 4100 v-8 in 1982. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. Thanks for the advice Brian! Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. You cannot compare them to old 350s. That inherently less smooth operation requires additional NVH dampening. Oil 0w or 5w -20 All the time. Hello! All Cylinders. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. It was good for about 10 miles and started with same loud knock noise. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. So for all of you that continue to complain about how bad these things are. They took the engine down today found so much damage inside they ordered a new engine from Detroit. They have plastic casing, so you can imagine what will happen with aged plastic. There is a good chance that some of the drivers side lifters decided to go. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. With 40000 Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! If the lifter actually fails so that the mechanism wont release, it wont work. Why would GM ever produce such problems with such little to gain. GM claims fuel improvements ranging from 5%-15% depending on the engine. My Wifes 17 Buick with afm was my attempt to get back to gm. I told her to never pull the gadget out. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. One the other hand, it came without AFM, VVT, or flex fuel capability. Thanks. The valve itself is part number W0133-2574213. Any guidance would surely be appreciated. Thank you again for the response. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Disable the afm. 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. 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. Their tech guys have seen it all and may have some thoughts on this as well. 1981 Cadillac V 864. Solenoids, new lifters also test voltage to solenoid pack all good their, An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes It is usually first noticed during highway driving. Constant engine and transmission problems. Ive only put a straight pipe exhaust, intake, and a boost controller on it. I have a noise in the engine but it seems to go away when revved up. The collapsed lifters will not engage the pushrods and both valves remain closed. 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. This basically deactivates the cylinder deactivation system. 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. Because its not just GM that have engine problems. the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. 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. Theyre also notorious for bad cam tower oil leaks. This really sucks. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. Hi. I still get a P0336 code every once in a while but still good to drive around town. A 17 with 5.3. 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. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. Question i just bought a 2005 Saab 9-7 with 5.3 v8, (same as GMC envoy) which came with AFM, the car runs fine, so if i just install the OBDII electronic device, is it just as likely that my lifters will still go bad? Also putting in a new transmission vs. rebuilding. I had one fail and it chattered the cam to the point that I had to Install a new cam. Most will want to get rid of the AFM immediately. Im always sorry to hear when people run into issues like these. All New lifters were from AC delco. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. I already ordered the parts to replace myself and remove the code. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. 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. 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? 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. 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? 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. Thankfull for any ideeas! To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. Replaced all 16 lifters due to collapsed lifter on CYl #4. Stopped at nearest gas station and found I was a quart low on oiladded oil and lights eventually went off and luckily we made it the 5 hour drive home. Found that all passenger side cylinders are not firing. I had a 2007 Yukon XL 5.3 with the AFM. I own a reputable repair shop. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. Does the disabler prevent the engine damage in the first place? 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? Its not GMs choice to use AFM. My question on a 2007 Chevy Tahoe 5.3 AFM 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! She started to have the lifter problem again after 60,000 miles more. Pulled the inntake and replaced valleypan With all the solenoids. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Once I get it back, could I install the Disabler safely. 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. I cant really tell from driving. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? One alternative is to swap in one of the larger 6.0 non-AFM truck cams. We need availability of a replacement engine without the AFM. I just took a long trip and it used 1.5 quarts of oil. I have a 2008 Buick Lacrosse super that I am having a hard time finding a tuner or a tune shop that can turn off the afm. Ditto , never buy a throw away vehicle again is my recommendation and my fix . Is there any potential down-side to doing this in other words, might this do more harm than good? will feel like a jerk asking the clerk at lowes to cut them again. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. 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? Its a CA EMMISIONS TRUCK. Once the lifter has been damaged, the cam is probably also damaged. [], I have a 2012 Silverado Z71 bought new. Thats a tough call, if the warranty will cover itId let it run out. Its ribbed with solenoids on the underside. Fortunately I received a reducing in house shop hourly rate. . These trucks cost too much to have a terrible product. When you drain the oil at three to four thousand miles its still clean. 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. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. 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. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. 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? When they are locked into position, they wont wear further and cause issues down the road. I have read synthetic isnt good for AFM lifters. I am having that done today on my 08 Suburban and its only costing me $225. We figured we already had the intake manifold off to install the engine, why run the risk of MIL only to have to removed the intake manifold again without being paid. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. 330-630-0240. Billy, there is some interesting trivia here on the L92. any help? 2011 Chevy Avalanche LTZ. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. The only problem is the extra spray on the cylinder models if a deflector isnt used and this can show up as increased oil consumption. Some drivers want V8 power under their foot at all times. I just bought a 2018 Silverado. GM should recall every vehicle with this terrible design flaw! I guess I might have to call a dealership or GM to get a definite answer on this one. GM uses 3 different styles all are engine specific. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. Just pulled it down in the garage there was no other damage , luckily. I have always loved Ford and Chevys , I dont like this Vehicle not one bit, starring shaft has to be lubed or it whines, front A arms has done been replaced, tapping in motor, leaf springs has been lubed, retorqued, put completely new leaf springs back in on the rear , grease all down from rims to body of truck, you have to clean often,console shakes as if milk shakes in console which later they also put rubber bushings in front of coils of shocks ( front end) .You lock it down in 44 it s metal to metal , As of now Im at 32,000 done gone threw all the arbitrator laws depending on how it goes? I have a 2013 1500 with the LC9. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. Are you saying that I am in the clear by a year and issues fixed? The lifter seems to recharge whenever the truck sits for some time. It is a bad deal for sure.ive fixed a few best thing u can do is delete it in buy kit.no sense in fixing a flawed problem with the same flawed parts. Changing the sensor didnt help. I noticed this discussion mainly addresses Chevy Silverados and other trucks? . Then changed the oil. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? I can literally drive from Seattle to Redding CA on one tank. Are there errors or something only the dealer can clear? . We did take it apart to check for metal possibly being trapped inside, it looked like brand new. Dummy Me thought gm learned its lesson in 1981 but they never did and I Too am stuck with a Buick thats just waiting to self destruct. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. 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. 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? Does the Pressure relief vavle ever go bad?? 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. Your email address will not be published. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). Having a hard time finding one .. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. I loved this rtuck until this happened!! [], [] 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. 1. I also notice that it doesnt go into V4 when it is cold. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. Yeh truck has 5237 miles on it Im servicing a 2011 Chevrolet 5.3 with AFM. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. Next day, fired it up to take the the junk yard and it ran great. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. Easier said than done. RANGE TECNOLOGY.COM. 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. Is this the shield you referred to in a past post? Run it and let it soak overnight. If you ignore it and keep driving, odds are you will destroy the cam as well. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. 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. The most common issue GM vehicle owners with AFM report is increased fuel consumption. Perhaps a flaw by design would be a more appropriate description . 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 . module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. I know I felt the same way. 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. 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 []. The Jury is still out on the Gen. 5s but the warranty could be an issue. has 92,000 miles and was just told I have cam and lifter failure. I am hoping this does the trick. Most will want to get rid of the AFM immediately and VVT isnt for []. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. All ready done valve job . 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. 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? Do not pay that amount. 50,000 miles. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. If possible, will simply not using VVT provide a powerful,good running engine? Send response to tkrieg@cox.net. This allows the engine to run in V8 mode. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . I have already dropped a lot of money on this truck (08 suburban). That might show up if you cut the filter and looked for debris in the pleats. This is my second Avalanche and I never had any issues with either of them. 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. 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. AFM Sucks!!! Engine starts but is throwing a misfire on cyls 4,7. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. I have a 12 with 4.8 Silverado 75000 miles hi brian when you replace the lifters do you have to change the guides also? There are so many more oil passages on engines these days. It works . please respond with your opinion. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. The LZ1 was upgraded with AFM and []. If the 4th cylinder lifter has failed, would driving it damage the engine? 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 am leaning heavily on installing the AFM disabler. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. 2 15 with 5.3 Sierras both with 100k and Dont want to make a move on a new truck or jump to a 2500 yet. .or something similar . i just bought a 2018 Silverado with the 5.3 Call chevy.They should being paying most of that. Should I wait until the warranty runs out, or will that be too late to stop possible damage? Looking forward to input from the forum, Thank you. Because I want to. Took the heads off again. I read something the other day which I found to be funny. it is the regulator guy! I have a shop 39 yrs . Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). 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). Have misfire code and engine has what I would call a surge while driving. Having it fixed now, just curious Seems like a problematic design. With 40000 Lost number four Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? I tried the trans fluid in the oil. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. 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. Definitely dont want to do anything to fix one problem and create another. Then it takes out the lifter again and again until you bite the bullet and replace the cam. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. Not sure which direction to go from here. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. I may just do that Vic. Todays computers are faster so it does work. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. Most of the complaints show up in the 2009 to 2011 model years. If I had been able to push the issue and get the time, I would have done the full fix at first without the hassle. Will the plug in deactivater fix the oil consumption or will it cause more consumption? When cruising on the freeway (for example) in 4 cylinder mode and jumping on the throttle to pass or get out in the fast lane, there is CONSIDERABLE and annoying and dangerous lag, like 3 seconds, and this is a problem. Diablo says yes but they do not provide tunes. I have successfully used a gadget that plugs into the ODBII. Is this an issue only with GM SUVs and trucks, or does it include cars too? When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy If I had wanted a 4 banger I would have bought one. 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?? I wont bother with blocking the relief valve. With the nipple, or without? A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . Now Im here tring to figure out what to do. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. Carbon Build-Up in the Intake Ports. Would it be fine to go ahead with the AFM Disabler? Plugs spark fine engine has power at higher RPMs although it is still in Limp mode / stabilitrack message, even after driving it a few times above 60 MPH then clearing errors with handheld programmer. I have a 2011 GMC with over 162,000 miles on it and it runs great! Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. Welcome to socialism folks . AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. I have also heard that the oil pump is to be changed and I have also heard that it does not matter. Please report back if you have any issues, but I think you are in good shape. Install an AFM Delete Kit Yesterday my motor (116,000 miles) felt like it went into limp mode when decelerating from 8 cyl to 4 cyl but it recovered.This is the second time that this has happened in 6 months so I think that I am on the slope.

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