However, they are only functional on engines that usedAFM. AFMengines use special lifters for cylinders 1, 4, 6, and 7. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. 2 15 with 5.3 Sierras both with 100k and 2019 Chevy, GMC Trucks Get Smarter Cylinder Deactivation - Car and Driver I asume low oil pressure cant make some of the DOD lifters to malfunction? My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. Accept i only have 60K on my truck and it hasnt recovered. Not sure what else it can be. They layed over night in engine oil before instalation. Active Fuel Management - Wikipedia If AFM has been deleted, its common just to use a Dorman drain plug (m14 x 1.5) to remove the pressure relief valve entirely. Hello! The 5 Most Common Chevy EcoTec3 5.3L Engine Problems I love the car so far. 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. Removing ignition lock cylinder when it won't turn at all Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. On one hand it has an aluminum block, which is nice. Engine oil pressure is fine. TheAFMsystem can be identified by its components. (Bought car 1 day before lifter died!) The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). 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 LZ1 was upgraded with AFM and []. Just recently, GM announced a temporary closure. Driver reported this occurred suddenly while driving down the highway. please respond with your opinion. It is being covered under warranty since I only have 72,000 miles on it. 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. another common cause for low OP is the oil pick up tube O ring. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Chevy 5.3 Engine Problems Are They That Long-Lasting? - Motor Verso [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. Is Your 5.3L V8 Engine Eating Up Too Much Oil? We - GM Parts Online Thank you for your time. Now you tell me AFM works and I will tell you; that you are full of shit! 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. Yes a poor design but a flaw ? Then again, it should have never been controlling those solenoids. Hi Grant is that disabler still working for you ? I have no clue what to do now. Given maximum engine power is not required during the majority of everyday driving, AFM works to deactivate engine cylinders when they are not needed, such as when cruising on the highway, thus. 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. Once the failure has occurred, the AFM shut off methods other than that probably wont work. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? Runs better than new now and no more oil consumpsion!! 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. Cylinder Deactivation to the Rescue. Replaced all 16 lifters due to collapsed lifter on CYl #4. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! How to Delete or Disable Active Fuel Management (AFM) That inherently less smooth operation requires additional NVH dampening. He unstuck it and I took it for a drive and same thing happened. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! If I had wanted a 4 banger I would have bought one. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. I already ordered the parts to replace myself and remove the code. Also putting in a new transmission vs. rebuilding. I also notice that it doesnt go into V4 when it is cold. , Production date on the vehicle is 04/2006 oddly enough. There may be an ignition related issue on that cylinder. []. Chevrolet Silverado 2014-Present: Common Problems The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. Dont drive it if you have a dead cylinder due to afm failure. It is also known as Displacement on Demand (DoD) or cylinder deactivation. Where can I buy a bolt to replace this relief valve ?? Just one. The 2nd went with a conventional valvetrain. Its got a hundred forty-five thousand miles on it. I will keep reading and take notes. I did noticed the oil consumption but it was rare that I would have to add oil. So I did the job one more time. If you swapped in a LS9 cam, you will find it makes good power at the very top, but its actually down from 5,000 rpm and lower where the truck spends the majority of its time. How to Deactivate AFM, DFM, MDS, and Start/Stop To Prevent - Holley CHANGE YOUR OIL!!!!! My 5.3 has a vin code of O. 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. 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. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. Our 2013 yukon with 47k miles just failed. I plan on getting a tuner to disable the AFM. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. 5.3-liter Chevy Engine Problems: What Should You Look Out For? 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. GM switched over to the 4100 v-8 in 1982. This happened on a camping trip with my kids last friday night. Pulled right valve cover an rockers on syl 6 dont move. The oil collapses the plunger inside the lifter. The car runs great apart from the shuddering at those speeds. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. With the nipple, or without? It actavated the lifter? The exhaust valve remains open during the intake stroke and closes just before BDC. Chris, when you did your delete, did you also change the cam at the same time? Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. 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 [] 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 know I felt the same way. The 2016+ Tacomas are junk. The oil is baked on to every component. I would appreciate any feedback. 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. 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? it is the regulator guy! Ditto , never buy a throw away vehicle again is my recommendation and my fix . It also mentions a valve cover replacement with revised PCV valve design. I have a 2013 1500 with the LC9. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. It was good for about 10 miles and started with same loud knock noise. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. Perhaps a flaw by design would be a more appropriate description . Very confusing stuff out there. The collapsed lifters will not engage the pushrods and both valves remain closed. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. 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. Do not pay that amount. Is there any reaction to the disabler when pulling a boat or trailer? AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. Who knew? Hi. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. Very expensive repair too! All Gen IV engine blocks haveAFMtowers and oil passages cast in. The engine is running on only four cylinders. They dont so any better than domestics on mpgs. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. So for all of you that continue to complain about how bad these things are. I have had some say that it is the valves and others say that it is the cats plugged. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. Then it takes out the lifter again and again until you bite the bullet and replace the cam. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. Replaced all lifters. Hopefully more is known by then. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. I just bought a 2018 Silverado. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. Glad I did. Would never take it on a long trip. 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. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. On the AFM lifters that dosnt work i have installed them With the oil hole Down! I had one fail and it chattered the cam to the point that I had to Install a new cam. I read something the other day which I found to be funny. I had to replace them all and the camshaft as well. Found that all passenger side cylinders are not firing. Truck has an active P0300 code and runs very rough. The motor I pulled was a 2007 LY5 with about 77k on it. I have 1999 5.3 Silverado that gets 19-20 miles to the gallon all the time this shit pile with dod only gets 14 miles to the gallon. Correct me if Im wrong- If such an item was available couldnt you then just replace the lifters in the 4 AFM cylinders and then just run a disabler or have your ECM/PCM reprogrammed to have AFM disabled permanently. You can monitor the oil level on your dipstick for 3,000 miles to determine if the deflector or plug would be needed, but chances are you wont based on the TSB. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. Verified over hundreds of trips, makes no sense. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? Thanks. GM uses 3 different styles all are engine specific. . I have the towing package on my 13 Tahoe LTZ. Just pulled it down in the garage there was no other damage , luckily. A 14 gmc 5.3 Sierra 85000 miles 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. Dod is the biggest failure sence the 8-6-4 caddie in 1981. Diablo says yes but they do not provide tunes. 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? 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? When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). Your email address will not be published. If the 4th cylinder lifter has failed, would driving it damage the engine? My fear now is not will it happen but when! My question is: do I install the electronic disabler on the new engine to avoid future issues? Does the Pressure relief vavle ever go bad?? In the mean-time I found that you can keep the engine from going into 4 cyl mode by using the manual shift (if so equipped) and keeping it out of 6th gear. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? I drive the same 320 mile trip every two weeks and drive the same route and full tank. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine.
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