I still get a P0336 code every once in a while but still good to drive around town. RANGE TECNOLOGY.COM. Ditto , never buy a throw away vehicle again is my recommendation and my fix . I dont know where to being to look for the problem. All these comments on the 5.3 are blowing my mind!!!. 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 would appreciate it if you let me know how you make out. Have there been improvements in more recent model years employing AFM [2014 or newer]? If thats the case, Summit Racing has dedicated truck cams that will increase power through the rangebottom to topbut the meat of it is in the mid-range where your engine spends the most time. 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. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. [] they have a downside? No problems with any to this point. So now at 168 thousand miles it still runs good but gets bad gass mileage. I guess I might have to call a dealership or GM to get a definite answer on this one. Thanks. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. 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. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. 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? Just shut AFM off. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. 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. I also notice that it doesnt go into V4 when it is cold. How is that an improvement. It works . 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. Basically rebuilt most of the engine while in the vehicle. 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. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. If you dont have VVT, you could use part number NAL-12561721 (LQ9) along with a 4-pole 3-bolt 2005 Corvette cam sprocket p/n NAL-12586481 to make it compatible with your ECM. Thats a tough call, if the warranty will cover itId let it run out. . In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. Im confused from the write up about the plug in. It is being covered under warranty since I only have 72,000 miles on it. Here's what you need to know: 1. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. The car runs great apart from the shuddering at those speeds. Its not GMs choice to use AFM. . Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. There is a good chance that some of the drivers side lifters decided to go. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. 1. I ran 0W-20 no more the 5000 miles between changes. 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. 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. Ayush Srivastava Ive been reading, with disgust and concern of the lifter/cam situation. This lowers the cost of building it [], [] aluminum block engine. When you don't need the full power of the engine, it provides better fuel economy." You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. 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. 1. Truck ran fine before that. If you ignore it and keep driving, odds are you will destroy the cam as well. Remembered that after I bought my Tahoe. 2 15 with 5.3 Sierras both with 100k and Help appreciated. Your email address will not be published. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. We chickened out though and just bolted the AFM solenoid plate onto the used engine. More information can be found in the GM TSB bulletin number 10-06-01-008g. I am wondering the same thing. I recently took a long trip and it burned 1.5 quarts of oil. Can they be faulty? No movement on the rocker arms. The engine had 200K miles. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? Its not possible to install them wrong? I have a 2012 Chevy Avalanche. bought at Brian Tooley Racing ! AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. I recently bought a low mileage 2013 Silverado and the lifters collapsed. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. It seems this tough engine has everything incorporated into it. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. That inherently less smooth operation requires additional NVH dampening. Replacing engine due to issues caused by AFM. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. No other V-8 truck of similar weight can do that (except another GM with AFM). 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. Didnt change exhaust nor tune so likely no change in power/torque. thx Brian, Knock on wood I drive a 2011 silverado 44 Ltd with the 5.3 AFM/DOD not tuned out or delete being used and have experienced no problems or any sign of problems for that matter juat rolled over 210,000 all original factory parts would you suggest I tune it out or juat let it ride I change my oil religiously and also use lucas products for all aspects of my motor. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. Would never take it on a long trip. A 14 gmc 5.3 Sierra 85000 miles Disable the afm. When I first bought my newer truck with fuel management, the GM tech at the dealership told me; if I wanted the engine to live a long life keep the RPMs below 4500. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? From what Ive read new and low mileage engines with no issues is ideal to do a afm delete, tune, or use of a disabler. Thanks. thanks brian love the info Im thinking of buying a ford now, I am going to buy a new truck in about a month it would be a Chevy but Dodge has lifter problems so they are out and Chevy has DoD problem.If they come out with Silverado without the DoD then i would buy one.But they arent so i will become a Ford man from now on, Have fun with that Ecobust motor & stretched timing chain . Thanks for the advice Brian! Teflon coatings does not last. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? You will get codes thrown if the afm is physically removed without telling the ECM you did so. If the lifter actually fails so that the mechanism wont release, it wont work. A 17 with 5.3. Dont drive it if you have a dead cylinder due to afm failure. [], [] way. Then it takes out the lifter again and again until you bite the bullet and replace the cam. 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. Seems like the AFM disabler device is working for a number of people including myself as the 5.3l AFM engine has inherent design faults. I am worrking on a 2007 chev Silverado 6.0 engine, [] the L76 that was equipped with AFM and had a ribbed valley cover, the L98 cover was []. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Does the disabler prevent the engine damage in the first place? This is my project car and will be my drive (about 5000 miles a year). I have had some say that it is the valves and others say that it is the cats plugged. The problem:. There may be an ignition related issue on that cylinder. Toyota has their own problems. I have the towing package on my 13 Tahoe LTZ. A 14 gmc 5.3 Sierra 85000 miles The older truck gets 19 mpg the newer truck with fuel management gets 14. General Motors has issued a service update for 2021 model year full-size truck and SUV models that are being shipped to dealerships and may be affected by valve lifter problems. I have a Yukon 116k it now needs its 3rd set of lifters and cam.