gm cylinder deactivation problems
Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. In four-cylinder mode, they act like air springs and allow for smooth operation. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? Question i just bought a 2005 Saab 9-7 with 5.3 v8, (same as GMC envoy) which came with AFM, the car runs fine, so if i just install the OBDII electronic device, is it just as likely that my lifters will still go bad? Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . It is a bad deal for sure.ive fixed a few best thing u can do is delete it in buy kit.no sense in fixing a flawed problem with the same flawed parts. Replaced all 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. Only thing I noticed with the oil consumption issue. Cant believe they havent fixed this in a decade. Required fields are marked *. 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. 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. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. Below youll see references to the L99 as a result. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. 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. they are known to become plugged. 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. It actavated the lifter? 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. I want to put a AFM disabler in it what all do I need to have done. Most will want to get rid of the AFM immediately. I wont bother with blocking the relief valve. I am trying to prevent same issue. Have not had a problem yet. The Jury is still out on the Gen. 5s but the warranty could be an issue. All Gen IV engine blocks haveAFMtowers and oil passages cast in. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? I call it active obama fuel management .A scam . Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. I called my service station and they told me to get it in ASAP. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. 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). Im servicing a 2011 Chevrolet 5.3 with AFM. If you left the original cam in, the AFM cylinders will be down about 25 lbs. Perhaps a flaw by design would be a more appropriate description . When you don't need the full power of the engine, it provides better fuel economy." [] 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. Not sure what else it can be. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? Fortunately I received a reducing in house shop hourly rate. December 20, 2021 A GM lifter recall should allegedly be ordered for Buick, Cadillac, Chevrolet and GMC vehicles equipped with 5.3L, 6.0L or 6.2L V8 engines. If I had wanted a 4 banger I would have bought one. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. 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. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. . There is no light on my dash or anything that indicates the system is active or exists, so its very confusing, Im still not sure if my vehicle has it or not. It is also known as Displacement on Demand (DoD) or cylinder deactivation. Because I want to. Who knew? Or not because it is the cast iron block and not he aluminum block? In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. They lasted one year with big problems. The motor I pulled was a 2007 LY5 with about 77k on it. Brian, I have the same question as Scott. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. Todays computers are faster so it does work. I have an 07 Silverado 1500 ltz. Engine starts but is throwing a misfire on cyls 4,7. It was well researched and tested back in the late seventies and eighties . module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. Chris, when you did your delete, did you also change the cam at the same time? On June 4th you stated The vehicles affected were 2007 to Feb. 2011 AFM equipped engines (Aluminum or Iron block-L94, LZ1, L99, LC9, LH6, L76, LFA, LMG, and LY5) I am looking at purchasing a 2012 Tahoe with the LMG per the build sheet. Please report back if you have any issues, but I think you are in good shape. Getting ready to diy for $450. Pushing forward. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. At this state, a disabler would probably do what you need it to do. AFMlifters have a history of failing and oil consumption can be a problem. 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. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. I only had 81k on the motor. Basically rebuilt most of the engine while in the vehicle. 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. Some guys have been able to use a tool through the top with the cover off to get it to release. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. This is in response to pretty much everyone. Can they be faulty? My question on a 2007 Chevy Tahoe 5.3 AFM I recently bought a 2018 Silverado 5.3L with AFM. 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? This system is the most effective way to disable AFM. Another option is to plug it entirely if the AFM is already removed. It works . I recently bought a low mileage 2013 Silverado and the lifters collapsed. Its got a hundred forty-five thousand miles on it. I havent has any lifter or cam issues. Would you get enough power to drive at freeway speeds? 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! Have a lifter problem on my 2010 5.3 Silverado. Solenoids, new lifters also test voltage to solenoid pack all good their, Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. It essentially turns your V8 engine into a V4 which saves fuel. My 5.3 has a vin code of O. It has AMF. Carbon Build-Up in the Intake Ports. 2 15 with 5.3 Sierras both with 100k and My point is that the engine likely on uses dod a small percentage of the time so can not really imagine that the delete causes any more issue than normal which may be the high oil consumption but do all of these engines with dod consume a lot of oil? Disable the afm. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Most of all, my concern is reliability. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. It could be the filter screen under the oil sending unit. Would doing the disabler option once I get it back be the right one? Took the heads off again. TheAFMcylinders are opposite of one another in the firing order. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? Took it to my dads and he tore things apart and found that I had a lifter that was stuck. also in the pan is another AFM oil filter near the external engine oil filter. Ayush Srivastava The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. Regardless of the AFM solenoid being commanded on or off. Mine did at the exact same time. Remembered that after I bought my Tahoe. AFMengines use special lifters for cylinders 1, 4, 6, and 7. im going to plug in a dissabler when im done to keep it V8 mode all the time. 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. I have a 2007 Gmc Envoy Denali with LH6 cant find a good LH6 engine but I found a 2011 LC9 engine w 52000 miles will everything plug up or what am I getting into? But after reading this thread, Im a little concerned about the long-term reliability. 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. 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 []. The engine also had 799 or 243 casting heads which are closely related to the LS6. . All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. As a side note, Range Technologies recommends removing the disabler between visits to the dealer as they will need to access the OBD-2 port. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. I have a shop 39 yrs . Lost number four I just got new warranty engine and dont want this issue again? Cylinders two, three, and eight are all similar in cylinder deactivation. There are so many more oil passages on engines these days. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . Then changed the oil. They took the engine down today found so much damage inside they ordered a new engine from Detroit. Help appreciated. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. The problem I am facing is that I want to drive this vehicle for at lease another 77K and do not want to drive my vehicle with this AFM issue. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. This is my project car and will be my drive (about 5000 miles a year). Battery was unplugged for a week.. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. My concern is if I leave the non-AFM lifter cover in place & have nothing to plug the 5 pin AFM solenoid connector into, will I get a MIL? I have a 12 wit 4.8 Silverado 75000 miles 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. GM should recall every vehicle with this terrible design flaw! 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. It is being covered under warranty since I only have 72,000 miles on it. When you eliminate the AFM system, the extra oil is no longer needed. I also notice that it doesnt go into V4 when it is cold. 1. When a deactivated cylinder is reactivated, the control system opens the exhaust valve first to evacuate the trapped exhaust gas, before reactivating the intake valve to allow reactivated cylinders to revert to the normal operation of the compression/combustion exhaust/intake cycle. After reading these forums Im a little concerned about my decision to stay with GM. Loved the looks and interior and thought a I got a great deal at $6k even. I have a noise in the engine but it seems to go away when revved up. changed oil , its all working now, but want to disable this sorry system. I was looking at the 08 escalade hybrid with dod on its 6.0 so wondering if the delete would contribute to the high oil consumption and therefore would adding the deflector be a good idea. [], I have a 2012 Silverado Z71 bought new. 1981 Cadillac V 864. Once I get it back, could I install the Disabler safely. I have no other engine problems and Id like to fix the issue. CAM motion says no just have to disable the AFM and VVT with a stock tune as the camshaft is not an aggressive camshaft but a drop in. I loved this rtuck until this happened!! (Non-AFM engines have a smooth cover.). If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. All these comments on the 5.3 are blowing my mind!!!. Everything else looked good. A tuner can often fix that as well by giving it some more ignition advance in these regions. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . All the time. How about if they just let us have a manual transmission agains for fuel mileage? If the 4th cylinder lifter has failed, would driving it damage the engine? You will get codes thrown if the afm is physically removed without telling the ECM you did so. the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. The collapsed lifters will not engage the pushrods and both valves remain closed. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. 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. Have there been improvements in more recent model years employing AFM [2014 or newer]? Open to suggestions about best course of action. My daughters car had about 230,000 miles when she complained of the problem. I guess I might have to call a dealership or GM to get a definite answer on this one. Theyre also notorious for bad cam tower oil leaks. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. How do you know if the lifter has failed? Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. The only solution is to replace the entire cylinder head. I have a 12 with 4.8 Silverado 75000 miles I have a 2013 1500 with the LC9. Easier said than done. This lowers the cost of building it [], [] aluminum block engine. I cant really tell from driving. The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. Thanks. in your opinion will this work, i really dont see any reason it wouldnt. misfire or anything. Hello! [] they have a downside? My 2011 Tahoe has a LMG motor in it with a build date of May 2011. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). I just took a long trip and it used 1.5 quarts of oil. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. Looking to tear down myself. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. 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. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. Is there any potential down-side to doing this in other words, might this do more harm than good? There are 5.3 cylinder deactivation problems that can occur. [] engines is that when VVT (variable valve timing) appeared and was later followed by AFM (which is Active Fuel Management, when the engine deletes four cylinders under light load) both of these packages drastically affect []. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. 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. Here's what you need to know: 1. yep, you are 100% Right, I called a local saab shop and they filled me in, in 2005 the trailblazer and clones have DOD (displacement on demand), My next issue is getting extra ignition keys on the cheap. Thank you for your time. How did your turn out? Thank you. The Tundra fares better but the frame has the rigidity of wet spaghetti and the 5.7 has had problems with VVT solenoids and the plastic timing chain tensioners. Pod. I quites down to nothing after running for about a minute. has 92,000 miles and was just told I have cam and lifter failure. You are correct. 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. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. 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. Its not GMs choice to use AFM. 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 dont plan on installing the delete kit at this time. Id wait until the warranty expires then disable. 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. 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. Thats not all bad because it saves the cost of an AFM delete kit. 330-630-0240. Teflon coatings does not last. Should I wait until the warranty runs out, or will that be too late to stop possible damage? We believe this confirmed that the AFM has never been operating in this vehicle. Its a CA EMMISIONS TRUCK. I have a Yukon 116k it now needs its 3rd set of lifters and cam. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? I would appreciate it if you let me know how you make out. I have no clue what to do now. I went with the new motor for the warranty. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. She drove it for another 35,000 and it went out again. The oil collapses the plunger inside the lifter. Thats a tough call, if the warranty will cover itId let it run out. The problem:. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . 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. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. Yeh truck has 5237 miles on it 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. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. I service plenty of these vehicles with AFM, and the ones I have to open up the engine for repair because of a failure doesnt surprise me anymore. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. Then I guess I have to spend a bunch of money and get the delete kit. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? 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. Hi. No problems with any to this point. i currently get 8 mpg with the vortec 350 and a 4l60, I have a 99 Sub k1500 that i get 16 to 18 hwy loaded lightly, I get about 14 on my 95 Tahoe 2 door with 5.7 and 4l60.
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