We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? (Non-AFM engines have a smooth cover.). Given that, would you recommend buying one of the OBD-II devices to disable AFM? Any guidance would surely be appreciated. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. 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. Regards, The lifter seems to recharge whenever the truck sits for some time. 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? If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. I am leaning heavily on installing the AFM disabler. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. Pod. Yes, always change all the lifters at once. I drive the same 320 mile trip every two weeks and drive the same route and full tank. Does the Pressure relief vavle ever go bad?? 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. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. The car runs great apart from the shuddering at those speeds. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. []. Why would GM ever produce such problems with such little to gain. We were getting a code that the cam position sensor was not functioning properly. Whats the next step? 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? You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. 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. Lost number four We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. has 92,000 miles and was just told I have cam and lifter failure. It only has about 9k miles on it. No movement on the rocker arms. Todays computers are faster so it does work. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. Toyota will be my next truck unless GM owns up and makes wright with consumers. any help? I just took a long trip and it used 1.5 quarts of oil. The 2016+ Tacomas are junk. Brian, I have the same question as Scott. Will this AFM DISABLER damage anything???. I have also heard that the oil pump is to be changed and I have also heard that it does not matter. 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. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. I have a 12 wit 4.8 Silverado 75000 miles 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. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. 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. Very confusing stuff out there. Corvette that does employ AFM. Any help would be appreciated. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. Hello. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. Number 7 cylinder lifters stops moving when truck starts. 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. It has 8,000 miles on it. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? Should I wait until the warranty runs out, or will that be too late to stop possible damage? The oil-pressure controlled system that operates the special lifters is VERY prone to failure, if the oil is not changed on time, OR if the wrong oil is used. If you left the original cam in, the AFM cylinders will be down about 25 lbs. As a side note, the early ones had a 24x reluctor and plastic chain guide (good) vs. the later ones with 58x and the spring loaded tensioner (not so good). Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. 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. They lasted one year with big problems. I just got new warranty engine and dont want this issue again? If possible, will simply not using VVT provide a powerful,good running engine? Battery was unplugged for a week.. If you are using VVT, you could use the NAL-12612273 (L92) cam. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. Now the problems back, I have 180k miles on it now. 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. 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?? 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. Run it and let it soak overnight. they are known to become plugged. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. Loved the looks and interior and thought a I got a great deal at $6k even. 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. Only running on drivers side cylinders. When you eliminate the AFM system, the extra oil is no longer needed. also in the pan is another AFM oil filter near the external engine oil filter. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . Anyway that horrible experiment was in the late 70s early 80s along with those converted Diesel engines..those like the 8-6-4 nonsense were just terrible failures. 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. Thank you again for the response. Carbon Build-Up in the Intake Ports. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. One must anticipate this. Getting ready to diy for $450. I have had some say that it is the valves and others say that it is the cats plugged. It has AMF. Send response to tkrieg@cox.net. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. My Wifes 17 Buick with afm was my attempt to get back to gm. All these comments on the 5.3 are blowing my mind!!!. 330-630-0240. I told her to never pull the gadget out. Just one. I have already dropped a lot of money on this truck (08 suburban). what deleter (if thats a real word) have you heard good things about. They have plastic casing, so you can imagine what will happen with aged plastic. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. A 17 with 5.3. No other truck my ass .lol my 99 silverado 1500 with the junk LR4 4.8l and 320k miles 9n itgets 21mpg all day long with 93 octane gas in it. It replaces the AFM components with standard parts. She drove it for another 35,000 and it went out again. I am having that done today on my 08 Suburban and its only costing me $225. You were lucky that it worked. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. Ive been reading, with disgust and concern of the lifter/cam situation. I just bought a 2018 Silverado. I am considering the same. (Bought car 1 day before lifter died!) I would rather stay a V8 full time than deal with AFM issues in the future. Pulled right valve cover an rockers on syl 6 dont move. You are correct. The most common issue GM vehicle owners with AFM report is increased fuel consumption. Learn how your comment data is processed. Most will want to get rid of the AFM immediately. Wow, thanks for the wisdom,, i checked my VIN Code (position #8, M=LH6) and my 2005 Saab 9-7x does have the LH6 motor with iron block, Are you sure its only 2007 & newer motors? We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. stalled in a certain way a warning wouldn be a bad idea. Drives way better for my mostly paved road driving. The result is improved combustion chamber pressure as the piston approaches top . General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. lol. The exhaust valve remains open during the intake stroke and closes just before BDC. 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. Oil flows to the special lifters through theAFMtowers. One the other hand, it came without AFM, VVT, or flex fuel capability. Verified over hundreds of trips, makes no sense. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. I called my service station and they told me to get it in ASAP. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. 2 15 with 5.3 Sierras both with 100k and In other words, the crankshaft and bearings were not visible. Clean oil is crucial. It does seem that when they start goingthey go quickly. Mine did at the exact same time. I own a reputable repair shop. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? I dont know where to being to look for the problem. Its got a hundred forty-five thousand miles on it. With the nipple, or without? 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??? IMHO . This happened on a camping trip with my kids last friday night. On one hand it has an aluminum block, which is nice. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. 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. [], I have a 2012 Silverado Z71 bought new. Double digit MPGs in my 98 K1500 would be a dream lmao. Next day, fired it up to take the the junk yard and it ran great. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? Because I want to. 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! I ave noticed the point about excess oil spray. I have a shop 39 yrs . The Definitive Guide to LS Engine Specs and LS Engine Upgrades, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance - OnAllCylinders, LS Engine Bore & Stroke Chart - OnAllCylinders, http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc, Range Active Fuel Management Disable Device, LS9 6.2L Engine Upgrade Guide: Expert Advice for LS9 Mods to Maximize Performance - OnAllCylinders, LMG 5.3L Engine Upgrade Guide: Expert Advice for LMG Mods to Maximize Performance - OnAllCylinders, L59 5.3L Engine Upgrade Guide: Expert Advice for L59 Mods to Maximize Performance - OnAllCylinders, L76 Car Engine Upgrade Guide: Expert Advice for L76 Car Engine Mods to Maximize Performance - OnAllCylinders, LH8 5.3L Engine Upgrade Guide: Expert Advice for L20 Engine Mods to Maximize Performance - OnAllCylinders, LH6 5.3L Engine Upgrade Guide: Expert Advice for LH6 Engine Mods to Maximize Performance - OnAllCylinders, LFA 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More - OnAllCylinders, LFA 6.0L Engine Upgrade Guide: Expert Advice for LFA Engine Mods to Maximize Performance - OnAllCylinders, LZ1 6.0L Engine Upgrade Guide: Expert Advice for LZ1 Engine Mods to Maximize Performance - OnAllCylinders, What the New LT2 Mid-Engine Corvette Reveals About the Future of GM LT Engines, All the Torques: How Summit Pro LS Truck Camshafts Help Truck Owners Maximize Performance, LMF 5.3L Engine Upgrade Guide: Expert Advice for LMF Mods to Maximize Performance - OnAllCylinders, L98 6.0L Engine Upgrade Guide: Expert Advice for L98 Mods to Maximize Performance, LQ4/LQ9 Engine Upgrade Guide: Expert Advice for LQ4 & LQ9 Mods to Maximize Performance - OnAllCylinders, Range AFM Disabler Reviews | Range Technology AFM Disabler 2019, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance, LM7 5.3L Engine Upgrade Guide: Expert Advice for LM7 Mods to Maximize Performance, LS4 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L76 6.0L Car Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L96 6.0L Engine Upgrade Guide: Expert Advice for L96 Mods to Maximize Performance, LC9 5.3L Engine Upgrade Guide: Expert Advice for LC9 Mods to Maximize Performance, LH6 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, LZ1 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, Chevy 4.3L Vortec Common Engine Problems - Vortec 4300 V6, https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-…, The 5 Most Common Chevy EcoTec3 5.3L Engine Problems, Chevy 6.0L Vortec Engine Problems - Common Vortec 6000 Problems, The 4 Most Common Chevy EcoTec3 6.2L Engine Problems, Gen 3 vs. Gen 4 LS Engines: How to ID Them (Video), Ask Away with Jeff Smith: Upgrades to GM LS 6.0L 4x4, LM4 5.3L Engine Upgrade Guide: Expert Advice for LM4 Mods to Maximize Performance, L33 5.3L Engine Upgrade Guide: Expert Advice for L33 Mods to Maximize Performance, Mailbag: Choosing an Engine Management System for an LS-Swapped '82 Olds Cutlass. 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??? If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. 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. If buying a tuner/chip which works best for that truck/engine? it is the regulator guy! You could also have tried that if the trans oil didnt work. Basically rebuilt most of the engine while in the vehicle. Replacing engine due to issues caused by AFM. You also need the disabler installed in your obd connector. 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. 8000 grand for the repair mine was 1,700.00 to repair, I had a 2004 small block v8(4.8) 331,000 miles on the truck,it was the usual on the maintenance front axles,etc. Had nothing but trouble out of it. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. 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. There are 5.3 cylinder deactivation problems that can occur. Thank you. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Thats a tough call, if the warranty will cover itId let it run out. Perhaps a flaw by design would be a more appropriate description . CHANGE YOUR OIL!!!!! I have a noise in the engine but it seems to go away when revved up. 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 just did the delete and replaced the cam as well. Traded it with 180K miles and did not experience any problems. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. Any problems to watch out for?Did you replace the VLOM? The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM 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. Just pulled it down in the garage there was no other damage , luckily. I would appreciate it if you let me know how you make out. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? RANGE TECNOLOGY.COM. 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. Do you think I can still disable AFM? I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. Just one or two. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. . Once the failure has occurred, the AFM shut off methods other than that probably wont work. Love the truck. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. Very expensive repair too! Definitely dont want to do anything to fix one problem and create another. do you fill to capacity anyways???? I am wondering the same thing. I have no other engine problems and Id like to fix the issue. Any truth to that? It has plenty of oil pressure and I put all new lifters in it. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . All eight cylinders are now powering the engine. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. The 2nd went with a conventional valvetrain. Easier said than done. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? My fear now is not will it happen but when! 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. I would just have the AFM disabled (tuned out) then. 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? I would appreciate any feedback. Im servicing a 2011 Chevrolet 5.3 with AFM. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. 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. Most of all, my concern is reliability. The computers had not evolved enough to control the sytem. Then changed the oil. It also has an electrical connector on the back. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. Covers me to 100K. Now Im here tring to figure out what to do. AFMlifters have a history of failing and oil consumption can be a problem. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). Would installing the Disabler solve this? How do you know if the lifter has failed? []. 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). I loved this rtuck until this happened!! 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. 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 That inherently less smooth operation requires additional NVH dampening. All the time. 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? Truck has an active P0300 code and runs very rough. Would doing the disabler option once I get it back be the right one? An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. 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. 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. 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. It essentially turns your V8 engine into a V4 which saves fuel. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. I could just transfer over the AFM lifter cover, but it is really nasty on the bottom side & I do not want to risk damaging this replacement engine if it is loaded with debris from the lifter & camshaft failure. I have no clue what to do now. Replaced all lifters on passenger side as well as pushrods for even wear. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? GM uses 3 different styles all are engine specific. Did Obama make them do this? Ive been a Ford guy my whole life, so I was unaware of AFM until a recent trip where I did a lot of highway driving and happened to bring up the real-time mpg display, where I saw it switch between V6 and V4. The engine has flex-fuel capability. Then had to drive the truck back to Tampa from Cheifland Fl. 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. Open to suggestions about best course of action. When they are locked into position, they wont wear further and cause issues down the road. Thanks. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. Replaced all lifters. im going to plug in a dissabler when im done to keep it V8 mode all the time. I already ordered the parts to replace myself and remove the code. I guess I might have to call a dealership or GM to get a definite answer on this one. Any thoughts or suggestions would be appreciated. I have read synthetic isnt good for AFM lifters. Thank you for your time. The lifter came apart and chewed up the lobe on the cam Im selling it I also told my friend at work when he asked me about my truck .I said Ill never by another GM ever. Thank you. I know a few guys with Tundras. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. Thankfull for any ideeas! 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. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. I still get a P0336 code every once in a while but still good to drive around town. i just bought a 2018 Silverado with the 5.3 Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? Engine starts but is throwing a misfire on cyls 4,7.
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