I can tell you for the past 2 years I changed out my LC9 5.3L fully synthetic oil every 3,000, even though Mobile Oil claims 10,000 miles or more. Active Fuel Management - Wikipedia I had to replace them all and the camshaft as well. Does cylinder deactivation affect engine life? - Quora I would appreciate it if you let me know how you make out. Any problems to watch out for?Did you replace the VLOM? The exhaust valve remains open during the intake stroke and closes just before BDC. .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. 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. All eight cylinders are now powering the engine. 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. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. It also mentions a valve cover replacement with revised PCV valve design. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. How about if they just let us have a manual transmission agains for fuel mileage? I have an 07 Silverado 1500 ltz. is it still working good since you have done that with the trans fluid? With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. 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? 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. He unstuck it and I took it for a drive and same thing happened. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. 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??? Cylinder Deactivation & Variable Engine Displacement - LiveAbout The result is improved combustion chamber pressure as the piston approaches top . 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? However, they are only functional on engines that usedAFM. Ditto , never buy a throw away vehicle again is my recommendation and my fix . Corvette that does employ AFM. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. Replace the cam or do the delete kit? No problems with any to this point. Chevy 5.3 Engine Problems Are They That Long-Lasting? - Motor Verso This lowers the cost of building it [], [] aluminum block engine. When you eliminate the AFM system, the extra oil is no longer needed. Every one of these engine will have a lifter fail, this is a travesty! 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. 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". I just took a long trip and it used 1.5 quarts of oil. I did noticed the oil consumption but it was rare that I would have to add oil. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . 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. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. I always have done my oil changes on time, not sure about the people who owned it before me though. My daughters car had about 230,000 miles when she complained of the problem. How is that an improvement. If you ignore it and keep driving, odds are you will destroy the cam as well. Wed recommend a call to our partners at Summit Racing. I am trying to prevent same issue. Basically rebuilt most of the engine while in the vehicle. I have successfully used a gadget that plugs into the ODBII. We believe this confirmed that the AFM has never been operating in this vehicle. Its Chrysler and Ford. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. The engine had 200K miles. It has plenty of oil pressure and I put all new lifters in it. Problems regarding Chevy 5.3L engines ticking noise and misfire. 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. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. Theyre also notorious for bad cam tower oil leaks. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. Once the lifter has been damaged, the cam is probably also damaged. 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. TheAFMsystem can be identified by its components. Chevrolet 5.3 Engine Issues and Recommendations Everything was fine for two weeks, ow customer complains s it same noise it made as before. I loved this rtuck until this happened!! . Todays computers are faster so it does work. The wife however found this deal on an Envoy Denali . Regarding the cylinder deactivation impact on fuel consumption . Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. What type of ODBII gadget did you use? I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. Once I get it back, could I install the Disabler safely. There may be an ignition related issue on that cylinder. Is this the shield you referred to in a past post? I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). There are so many more oil passages on engines these days. Once the failure has occurred, the AFM shut off methods other than that probably wont work. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. The biggest problem is nobody changes their oil on time. Not sure what else it can be. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. The Cylinder Deactivation system, known as the Active Fuel Management system by GM, shuts off some of the cylinders when extra power is not needed which improves fuel economy. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. The LFA was upgraded with AFM and [], [] improvement over AFM, DFM has 17 different cylinder firing patterns and switches seamlessly between them to provide just []. 2019 Chevy, GMC Trucks Get Smarter Cylinder Deactivation - Car and Driver If I had wanted a 4 banger I would have bought one. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! changed oil , its all working now, but want to disable this sorry system. AFM - active fuel management strategy which deactivates the lifters on specific . We chickened out though and just bolted the AFM solenoid plate onto the used engine. Chevy Silverado V8 To V4 Problems - Tools Bible How did your turn out? Engine oil pressure is fine. another common cause for low OP is the oil pick up tube O ring. 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. I am confused about the plug in disabler. I know a few guys with Tundras. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. 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. what deleter (if thats a real word) have you heard good things about. Better airflow reduces drag on the pistons and the associated pumping losses. i just bought a 2018 Silverado with the 5.3 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. 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. I will be installing the AFM deactivator tonight when I get hoe. Chris, when you did your delete, did you also change the cam at the same time? With the nipple, or without? An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation.