Have not had a problem yet. I had privilege to work on some of that garbage they never did work . I would. AFMengines use special lifters for cylinders 1, 4, 6, and 7. 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. If you are using VVT, you could use the NAL-12612273 (L92) cam. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? I am having that done today on my 08 Suburban and its only costing me $225. Any advice that you could offer would be great. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. Yeh truck has 5237 miles on it I still get a P0336 code every once in a while but still good to drive around town. 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. The 2nd went with a conventional valvetrain. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. If I put the Range module on, is that all I need to do, both now and long term? 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. The system uses solenoids to deliver oil pressure to control. 2011 Chevy Avalanche LTZ. Open to suggestions about best course of action. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. All eight cylinders are now powering the engine. 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. Friend will send to me from Arizona. Teflon coatings does not last. 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. Im crossing my fingers it does the trick! I have also heard that the oil pump is to be changed and I have also heard that it does not matter. 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. . Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. Hello! [] 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. Weve written some articles on the various Vortec engine upgrade paths, such as this one on LQ4 and LQ9it discusses some of the better options for choosing a cam intended for use in a truck. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. 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. [] 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 []. If possible, will simply not using VVT provide a powerful,good running engine? I sold them when they were new. It will show up as a misfire code in a cylinders 1,4,6, or 7. Why would GM ever produce such problems with such little to gain. [] 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. If buying a tuner/chip which works best for that truck/engine? Just shut AFM off. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. It came back on last Wednesday starting with a flash. In four-cylinder mode, they act like air springs and allow for smooth operation. 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. Now you tell me AFM works and I will tell you; that you are full of shit! they are known to become plugged. [], [] 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 recently bought a 2018 Silverado 5.3L with AFM. These trucks cost too much to have a terrible product. Fouls those plugs. Can I (should I) also change to a standard volume oil pump? Cylinder deactivation works to save fuel, but it may not be for the reasons you think. 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??? 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 car runs great apart from the shuddering at those speeds. Your email address will not be published. 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. I have 217,000+ on it and it never fails meever! will feel like a jerk asking the clerk at lowes to cut them again. With the nipple, or without? 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? 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. Replaced all lifters on passenger side as well as pushrods for even wear. Getting ready to diy for $450. Clean oil is crucial. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. The LZ1 was upgraded with AFM and []. Oil 0w or 5w -20 We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. There is a good chance that some of the drivers side lifters decided to go. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. 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. Then changed the oil. Toyota will be my next truck unless GM owns up and makes wright with consumers. The most common issue GM vehicle owners with AFM report is increased fuel consumption. The Jury is still out on the Gen. 5s but the warranty could be an issue. Any help would be appreciated. Carbon Build-Up in the Intake Ports. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. "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. Who knew? if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . Battery was unplugged for a week.. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? What makes you think it was a design flaw ? []. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. Never did strand me on the side of the road way. This is in response to pretty much everyone. [], [] as the LS engine familys hybrid engine in trucks and SUVs. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. 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. As you said, the ECM was never seeing the AFM so I think youre good to go. Replaced all 16 lifters due to collapsed lifter on CYl #4. . , Production date on the vehicle is 04/2006 oddly enough. I am not in a position to have a new cam and lifters installed but Im also not in a position to not having a running truck! It also mentions a valve cover replacement with revised PCV valve design. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. Seafoam with syn oil change only fixed for a week. Since the tranny oil worked, you should now change the oil, right? I have a 2013 1500 with the LC9. I just bought a 2018 Silverado. The write up confuses me. bought at Brian Tooley Racing ! Im curious as to how much tran fluid you put in? Can they be faulty? Looking to tear down myself. She had driven it for a couple of months that way. Shame this happened. Then it takes out the lifter again and again until you bite the bullet and replace the cam. i currently get 8 mpg with the vortec 350 and a 4l60, I have a 99 Sub k1500 that i get 16 to 18 hwy loaded lightly, I get about 14 on my 95 Tahoe 2 door with 5.7 and 4l60. Had similar problems under warranty, no telling what they rigged me up with at the dealer. It seems this tough engine has everything incorporated into it. I ran 0W-20 no more the 5000 miles between changes. Now the problems back, I have 180k miles on it now. Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. Most of the complaints show up in the 2009 to 2011 model years. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. My question on a 2007 Chevy Tahoe 5.3 AFM the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. We chickened out though and just bolted the AFM solenoid plate onto the used engine. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. I plan on getting a tuner to disable the AFM. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). It actavated the lifter? My 2002 I had over 298K on it with no engine related issues. I just did the delete and replaced the cam as well. So now at 168 thousand miles it still runs good but gets bad gass 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? 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. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes All ready done valve job . Every one of these engine will have a lifter fail, this is a travesty! Would you get enough power to drive at freeway speeds? The problem:. 4,7 plugs foul runs rough at idle. I have a 2014 Silverado with a 5-3. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. I know a few guys with Tundras. Thank you. Basically rebuilt most of the engine while in the vehicle. After all we bailed them out of bankruptcy. We were getting a code that the cam position sensor was not functioning properly. You could also have tried that if the trans oil didnt work. One must anticipate this. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. Corvette that does employ AFM. IMHO . 50,000 miles. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. 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? The GM 2.7-liter L3B Turbo four-cylinder engine for Chevy Silverado and GMC Sierra pickups is meant to change minds about power and torque in a small package. [], [] way. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. how many miles do you have on your engine? You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. However I do have 7 year bumper to bumper warranty that covers this problem if I start to get lifter problems over the next 2 years.. On the other hand if get the AFM disabler installed I am pretty sure that I void the warranty from what I read on the policy. No clue what to do. The biggest problem is nobody changes their oil on time. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! It was well researched and tested back in the late seventies and eighties . I only had 81k on the motor. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. so the trans fluid worked for you then? General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. If you left the original cam in, the AFM cylinders will be down about 25 lbs. [] they have a downside? Pushing forward. Then had to drive the truck back to Tampa from Cheifland Fl. 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. Cylinders two, three, and eight are all similar in cylinder deactivation. I cant really tell from driving. Told her that it would not last and that she needed to find a different way to get around. 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 service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. My Wifes 17 Buick with afm was my attempt to get back to gm. 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. Just pulled it down in the garage there was no other damage , luckily. 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. Then I guess I have to spend a bunch of money and get the delete kit. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Another option is to plug it entirely if the AFM is already removed. Replacing engine due to issues caused by AFM. [], I have a 2012 Silverado Z71 bought new. also in the pan is another AFM oil filter near the external engine oil filter. This happened on a camping trip with my kids last friday night. I speak from some experience. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? Your email address will not be published. Hopefully more is known by then. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Since no air can get in or out, four cylinders provide no power. I had one fail and it chattered the cam to the point that I had to Install a new cam. No other V-8 truck of similar weight can do that (except another GM with AFM). One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. Should I buy one to disable the V4 mode? The oil collapses the plunger inside the lifter. If you ignore it and keep driving, odds are you will destroy the cam as well. Once the failure has occurred, the AFM shut off methods other than that probably wont work. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? I was getting ~ 30 mpg, so I love that. 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. 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. 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. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! This should be added to your earlier model if you experience oil consumption. I call it active obama fuel management .A scam . Should I wait until the warranty runs out, or will that be too late to stop possible damage? It replaces the AFM components with standard parts. Do you think I can still disable AFM? Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. Because its not just GM that have engine 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. There is a chance the cam lobe was stressed and started to deteriorate. While the system sounded good, the microprocessors scrambled to activate, deactivate, and then reactivate cylinders as driving conditions quickly changed, causing the car to hesitate, buck, and stall. Hi Brian, He used seafoam and changed to synthetic oil. Better airflow reduces drag on the pistons and the associated pumping losses. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. The wife however found this deal on an Envoy Denali . Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Yes a poor design but a flaw ? My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. The only solution is to replace the entire cylinder head. 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. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . AFM Sucks!!! Would installing the Disabler solve this? The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. The engine has flex-fuel capability. Active Fuel Management (AFM) is a trademarked General Motors technology that improves gas mileage by shutting down half of the cylinders under light-load conditions to reduce fuel consumption. I am considering the same. The valve itself is part number W0133-2574213. But the problem at that time was the computer technology. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. All these comments on the 5.3 are blowing my mind!!!. My 5.3 has a vin code of O. Double digit MPGs in my 98 K1500 would be a dream lmao. It has the orings in place, that seals the towers. I told her to never pull the gadget out. Regarding the cylinder deactivation impact on fuel consumption . Thanks for the detailed post! Ketil, let us know what you find out. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. I have an 07 Yukon with over 180K. So I researched and got an AFM disabler. Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors.It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy.Estimated performance on EPA tests shows a 5.5-7.5% improvement in fuel economy. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. 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? I couldnt agree with you less, yet I respect your opinions. I am wondering the same thing. I have been assuming this is just a slow to pump-up lifter or lifters. Do not pay that amount. This video covers the steps youll need to take before upgrading to a larger [], I am installing a complete delete system, just wondering what it will do if dont plug the oil pressure relief valve? When you don't need the full power of the engine, it provides better fuel economy." 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? This new lawsuit is essentially identical to the previous. 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. Only thing I noticed with the oil consumption issue. 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. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. Chris, when you did your delete, did you also change the cam at the same time? Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. Absolutely agree, but we all know GM cant afford to recall them all & definitely wont, gettin a Toyota, but first will go to GM dealer and ask to see a truck without AFM & when they say they dont have it Ill say See ya, I have an appointment with the Toyota dealer! Always had GMs never anything else till now. in your opinion will this work, i really dont see any reason it wouldnt. 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. You are correct. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Apparently all passkey III keys are not the same,, I bought one that said for 2006 impala assuming all pk3 would be the same, and I could not get it programmed in my saab 9-7,, so how Im waiting on ones that specially said for saab 9-7. hoping they will work. It uses a M14 x 1.5 thread plug like Dorman 65217. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. Its a CA EMMISIONS TRUCK. 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". There are so many moving components in an engine these days as opposed to the past. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. 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 []. 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? 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. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. How do you know if the lifter has failed? Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? How long did it take? I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. I asume low oil pressure cant make some of the DOD lifters to malfunction? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. 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. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? Most will want to get rid of the AFM immediately and VVT isnt for []. I have a 2011 GMC Sierra 1500 with the 5.3. It has 8,000 miles on it. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. I own a reputable repair shop. Is this an issue only with GM SUVs and trucks, or does it include cars too? Does the disabler prevent the engine damage in the first place? Batten, followed by several years developing performance pistons at Wiseco Piston Co. Today, Brian develops performance parts for Summit Racing Equipment and is a regular OnAllCylinders contributor. the body is in great shape. . Don't even get me started on the shortened life of the cooling, starting and charging systems. Is the Pressure relief valve replaceable? Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. What the biggest reported problem with Chevy Silverados? I wont bother with blocking the relief valve. Some drivers want V8 power under their foot at all times. 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. [] 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 havent has any lifter or cam issues. Loved the looks and interior and thought a I got a great deal at $6k even.