Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. I guess I might have to call a dealership or GM to get a definite answer on this one. I recently bought a 2018 Silverado 5.3L with AFM. There are a few potential causes for Chevy cylinder deactivation problems, including oil consumption problems, harmful to the environment, sludge issues, and lower cylinder temperatures. I dont plan on installing the delete kit at this time. Brian, I have the same question as Scott. Dont drive it if you have a dead cylinder due to afm failure. Driver reported this occurred suddenly while driving down the highway. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). I have no clue what to do now. (Non-AFM engines have a smooth cover.). CHANGE YOUR OIL!!!!! Will this AFM DISABLER damage anything???. Drives way better for my mostly paved road driving. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. Chevrolet 5.3 Engine Issues and Recommendations I was getting ~ 30 mpg, so I love that. Now Im here tring to figure out what to do. Should I buy one to disable the V4 mode? All Gen IV engine blocks haveAFMtowers and oil passages cast in. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. I called my service station and they told me to get it in ASAP. Hi my name is noel I am a mobile mechanic and I have a client that was having trouble with the lifters on a 2011 gmc yukon Denali 6.2 I placed the lifters after finishing I still had a problem with cylinder 8,6,3 rocker arms were not moving so I replaced the cam OEM part but still having miss fire on cylinder 6 what should I do to get rid of this problem, [] computer cannot switch over to four-cylinder mode. All Cylinders. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. I have successfully used a gadget that plugs into the ODBII. I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. Now you tell me AFM works and I will tell you; that you are full of shit! Would installing the Disabler solve this? Looking to tear down myself. 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). We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Im curious as to how much tran fluid you put in? Cost about $250, but it is not fool proof. stalled in a certain way a warning wouldn be a bad idea. Corvette that does employ AFM. It works . What type of ODBII gadget did you use? You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. 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. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . A 17 with 5.3. Im crossing my fingers it does the trick! I just got new warranty engine and dont want this issue again? I have a shop 39 yrs . So I did the job one more time. 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. 2018 new truck has me really disgusted If I had checked this out better, there would have been one less POS Chevy sold last year ! You were lucky that it worked. Given that, would you recommend buying one of the OBD-II devices to disable AFM? I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. The wife however found this deal on an Envoy Denali . 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. Diablo says yes but they do not provide tunes. Hi Brian, I would appreciate any feedback. Toyota will be my next truck unless GM owns up and makes wright with consumers. 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. Theyre also notorious for bad cam tower oil leaks. Billy, there is some interesting trivia here on the L92. I love the car so far. It uses a M14 x 1.5 thread plug like Dorman 65217. This basically deactivates the cylinder deactivation system. Unfortunately, I found out about the lifters too late. I have a 2011 GMC with over 162,000 miles on it and it runs great! I recently bought a low mileage 2013 Silverado and the lifters collapsed. Didnt change exhaust nor tune so likely no change in power/torque. No problems with any to this point. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. If someone didnt want to spend gas buy a Toyota. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. I know a few guys with Tundras. [], I have a 2012 Silverado Z71 bought new. Carbon Build-Up in the Intake Ports. My 5.3 has a vin code of O. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. Im confused from the write up about the plug in. As it turned out one of the cam bearings was failing and causing the cam to wobble (my guess) which messed up the AFM and probably some other stuff too. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. 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? I have a 2011 GMC Sierra 1500 with the 5.3. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. There may be an ignition related issue on that cylinder. There is no way cylinder deactivation and the resulting temperate decrease, with sudden piston heat expansion when all cylinders are engaged, can't have undo wear and tear on the rings, valves, piston and bore. GM claims fuel improvements ranging from 5%-15% depending on the engine. Thank you again for the response. A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. . 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?? The oil collapses the plunger inside the lifter. [] 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. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. I only had 81k on the motor. I couldnt agree with you less, yet I respect your opinions. Thanks for your help. The 2nd went with a conventional valvetrain. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. 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. im going to plug in a dissabler when im done to keep it V8 mode all the time. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. . GM uses 3 different styles all are engine specific. Very expensive repair too! . I just bought a 2018 Silverado. GM switched over to the 4100 v-8 in 1982. I speak from some experience. NOTE:If you were in a situation where youve installed the AFM delete kit, but dont have access to a programmera disabler can still be a viable option. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. Your email address will not be published. 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. I have a 2007 Yukon XL with the 5.3L and am planning to do this as my lifters have failed and it rattles loudly if it starts, and runs limp. Why this happens is a more . Hopefully more is known by then. It is currently at the dealer having a new long block installed under warranty. Put everything back together proper torque, gakets, valve seals, etc. How do you know if the lifter has failed? 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. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM Thanks for the detailed post! Battery was unplugged for a week.. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. NOT GOOD!! AFMengines use special lifters for cylinders 1, 4, 6, and 7. 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? Im praying that my RangeTech buys me a few years. I am a long time GM fan but after reading how they messed up the 5.3 ( I had a fantastic 2003 Z72 off road) Ill look else ware for my next vehicle. [] 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. I ave noticed the point about excess oil spray. It is being covered under warranty since I only have 72,000 miles on it. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. You cannot compare them to old 350s. Everything was fine for two weeks, ow customer complains s it same noise it made as before. If buying a tuner/chip which works best for that truck/engine? Does the disabler prevent the engine damage in the first place? 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. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. No it runs fine on sylinder one but not on 6 or 7!!! These trucks cost too much to have a terrible product. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. Does the Pressure relief vavle ever go bad?? 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. If you just crack it without it starting it moves all the time . Truck ran fine before that. The car runs great apart from the shuddering at those speeds. You are correct. 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. Ketil, let us know what you find out. it is the regulator guy! 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. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. No problems with any to this point. Im servicing a 2011 Chevrolet 5.3 with AFM. 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. They have plastic casing, so you can imagine what will happen with aged plastic. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. I have a Yukon 116k it now needs its 3rd set of lifters and cam. The engine will switch to operating on fewer cylinders when cruising at a constant speed. Thanks. [] they have a downside? It replaces the AFM components with standard parts. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? My 2002 I had over 298K on it with no engine related issues. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Any guidance would surely be appreciated. If the lifter actually fails so that the mechanism wont release, it wont work. Thank you for your time. I have read synthetic isnt good for AFM lifters. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. 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. In other words, the crankshaft and bearings were not visible. Take a look at what bmw did in its R1250 bike. Having a hard time finding one .. Ive only put a straight pipe exhaust, intake, and a boost controller on it. It seems this tough engine has everything incorporated into it. Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Here's what you need to know: 1. Very confusing stuff out there. 1. If I had wanted a 4 banger I would have bought one. It came back on last Wednesday starting with a flash. Is this an issue only with GM SUVs and trucks, or does it include cars too? There has been a lifter noise since I bought the truck 1 year ago. Easier said than done. I still get a P0336 code every once in a while but still good to drive around town. Really could use some pointers. It also mentions a valve cover replacement with revised PCV valve design. I would say maybe 5% of my customers keep up on their oil changes. Help appreciated. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? AFMlifters have a history of failing and oil consumption can be a problem. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! I got the AMF disabler anyway and so far so good. Engines with AFM use a high-volume oil pump. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. I had one fail and it chattered the cam to the point that I had to Install a new cam. 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. Still have no power. hi brian when you replace the lifters do you have to change the guides also? Install an AFM Delete Kit Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. 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 owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? Some guys have been able to use a tool through the top with the cover off to get it to release. She drove it for another 35,000 and it went out again. Have a lifter problem on my 2010 5.3 Silverado. Then changed the oil. I own a reputable repair shop. Required fields are marked *. 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. . With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. I am wondering the same thing. One the other hand, it came without AFM, VVT, or flex fuel capability. With 40000 http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. 50,000 miles. Solenoids, new lifters also test voltage to solenoid pack all good their, Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? Thats not all bad because it saves the cost of an AFM delete kit. There are no changes in the valves or the springs. How did your turn out? 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. They layed over night in engine oil before instalation. I know I felt the same way. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. 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. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. Any problems to watch out for?Did you replace the VLOM?

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