have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Our 2013 yukon with 47k miles just failed. Teflon coatings does not last. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. I ordered a electronic disabler for it today. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. How to Delete or Disable Active Fuel Management (AFM) on GM Engines I ave noticed the point about excess oil spray. I have a shop 39 yrs . Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. Not sure which direction to go from here. After reading these forums Im a little concerned about my decision to stay with GM. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. thank You so much! I ran 0W-20 on more the 5000 miles between changes. He used seafoam and changed to synthetic oil. Because your Saab is mechanically similar to the Trailblazer, wed suggest that you are correct and no changes need to be made to the relief valve. 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. I have only put about 600 miles on it and noticed that the oil was a bit low and am hoping that it was that way when I picked it up. Whats the next step? PDF Service Bulletin Bulletin No.: 20-NA-038 Date: March, 2020 Or not because it is the cast iron block and not he aluminum block? Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. please respond with your opinion. That inherently less smooth operation requires additional NVH dampening. You will get codes thrown if the afm is physically removed without telling the ECM you did so. Why does GM's cylinder deactivation cause lifter failure? Any guidance would surely be appreciated. Install an AFM Delete Kit 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. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. When they are locked into position, they wont wear further and cause issues down the road. Install ls3 valley cover. Since no air can get in or out, four cylinders provide no power. I recently bought a low mileage 2013 Silverado and the lifters collapsed. What type of ODBII gadget did you use? Thats a tough call, if the warranty will cover itId let it run out. The engine is running on only four cylinders. The most common issue GM vehicle owners with AFM report is increased fuel consumption. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. GM Making New Trucks Without Cylinder Deactivation Due To Chip - Motor1 A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. I am trying to find out of this is true. When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. How did your turn out? It was well researched and tested back in the late seventies and eighties . General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. 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. All New lifters were from AC delco. Regarding the cylinder deactivation impact on fuel consumption . It seems to me that the high volume oil pump should not hopefully cause premature wear but if it is pushing more oil through the heads than I guess the valve stem seals have more work to do. Battery was unplugged for a week.. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . Is this due to the AFM being shut off? Looking forward to input from the forum, Thank you. 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". This system is the most effective way to disable AFM. Dont want to make a move on a new truck or jump to a 2500 yet. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). 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 There are so many more oil passages on engines these days. Would installing the Disabler solve this? 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. We need availability of a replacement engine without the AFM. Hi Brian, I tried the trans fluid in the oil. The wife however found this deal on an Envoy Denali . I dont plan on installing the delete kit at this time. Remembered that after I bought my Tahoe. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. It also has an electrical connector on the back. I own a reputable repair shop. All Cylinders. Hopefully more is known by then. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? One must anticipate this. I love the car so far. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. I call it active obama fuel management .A scam . 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. Ditto , never buy a throw away vehicle again is my recommendation and my fix . Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? Covers me to 100K. hi brian when you replace the lifters do you have to change the guides also? the body is in great shape. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. Truck ran fine before that. Should I wait until the warranty runs out, or will that be too late to stop possible damage? The motor I pulled was a 2007 LY5 with about 77k on it. What makes you think it was a design flaw ? I also notice that it doesnt go into V4 when it is cold. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. As you said, the ECM was never seeing the AFM so I think youre good to go. The lifter seems to recharge whenever the truck sits for some time. Most will want to get rid of the AFM immediately and VVT isnt for []. You are correct. How to Fix GM's Cylinder Deactivation Problems Number 7 cylinder lifters stops moving when truck starts. Have there been improvements in more recent model years employing AFM [2014 or newer]? The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. I couldnt agree with you less, yet I respect your opinions. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. I have a 2014 Silverado with a 5-3. I asume low oil pressure cant make some of the DOD lifters to malfunction? The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. At this state, a disabler would probably do what you need it to do. 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. Im a little confused on the problems too, Im reading that the 2007 pick-ups with 5.3 really had bad oil consumption and plug fouling problems, but is the 2005 5.3 that came in the trailblazers, envoys, and sabb 9-7s the exact same design as these pick-ups and prone to the same failures? Its not possible to install them wrong? Stopped at nearest gas station and found I was a quart low on oiladded oil and lights eventually went off and luckily we made it the 5 hour drive home. I dont know where to being to look for the problem. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Just one or two. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. [] 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 []. I want to put a AFM disabler in it what all do I need to have done. 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). No it runs fine on sylinder one but not on 6 or 7!!! Well, they move a couple of times after startup thats all.Asume its the same on syl 7 on the other side.Disconected the Connector to the solenoids, no difference. 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. I wouldnt trade my 2000 Silverado, 5.3 liter that has constantly gotten 20 mpg since I bought it 15 years ago, for a dozen of these new $50,000 POS. 1. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. Still have no power. 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. 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. Most of all, my concern is reliability. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . The detergent. Brian, I have been reading your article about the AFM. [] 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. 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. 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. 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 []. 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. He stated if I continued to exceed 4500 RPM it would blow the lifters out. The result is improved combustion chamber pressure as the piston approaches top . No other truck my ass .lol my 99 silverado 1500 with the junk LR4 4.8l and 320k miles 9n itgets 21mpg all day long with 93 octane gas in it. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. The oil is baked on to every component. 2014 Chevy, GMC Pickups Recalled For Cylinder-Deactivation Issue Bought an 07 GMC Yukon 5.3 with the AFM, 87k. Yes thats true. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. Any problems to watch out for?Did you replace the VLOM? Shame this happened. . I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. I had one fail and it chattered the cam to the point that I had to Install a new cam. Replaced all lifters on passenger side as well as pushrods for even wear. If you left the original cam in, the AFM cylinders will be down about 25 lbs. She started to have the lifter problem again after 60,000 miles more. another common cause for low OP is the oil pick up tube O ring. If so what would the vin code be? The trucks are only supposed to use two four. They should let us the better mileage. No clue what to do. I have an 07 Silverado 1500 ltz. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? The cost of just rings $4,000.00, [] Disable your Chevy AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] like front timing cover, knock sensor location, cylinder head style (cathedral ports), AFM (Active Fuel Management), and other components are key clues to which engine family youre looking []. Fouls those plugs. 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. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. 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. Only thing I noticed with the oil consumption issue. The write up confuses me. It has has 9000 miles and no lifter or other issues or codes so far. AFM Sucks!!! They learned that the oil level sensor was necessary and that we were supposed to have been advised that we needed to reuse the original oil pan. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. Pulled right valve cover an rockers on syl 6 dont move. 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. I have a 2011 Chevy Tahoe with the 5.3 Gen 4 LS (VIN Code 0) and I bought a CAM motion DOD/AFM delete kit, 3 bolt drop in CAM Motion stage 2 camshaft, VVT delete kit and finally a Diablo Predator 2 Premium for GM programmer. Found that all passenger side cylinders are not firing. So for all of you that continue to complain about how bad these things are. My 5.3 is. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? Any advice that you could offer would be great. You may want to update your post. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. There may be an ignition related issue on that cylinder. I know I felt the same way. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. 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. Is there any potential down-side to doing this in other words, might this do more harm than good? .IMHO . Take a look at what bmw did in its R1250 bike. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. Pushing forward. How do you know if the lifter has failed? There is a good chance that some of the drivers side lifters decided to go. Engines with AFM use a high-volume oil pump. 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 . It only has about 9k miles on it. The problem:. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? If you are using VVT, you could use the NAL-12612273 (L92) cam. Engine starts but is throwing a misfire on cyls 4,7. There is a chance the cam lobe was stressed and started to deteriorate. Yesterday my motor (116,000 miles) felt like it went into limp mode when decelerating from 8 cyl to 4 cyl but it recovered.This is the second time that this has happened in 6 months so I think that I am on the slope. It is also known as Displacement on Demand (DoD) or cylinder deactivation. A 17 with 5.3. 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. I just took a long trip and it used 1.5 quarts of oil. Thank you for your time. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . I would just have the AFM disabled (tuned out) then. Do you think I can still disable AFM? Constant engine and transmission problems. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. Don't even get me started on the shortened life of the cooling, starting and charging systems. How to Deactivate AFM, DFM, MDS, and Start/Stop To Prevent - Holley What would you do if you were in my situation? Hi. The exhaust valve remains open during the intake stroke and closes just before BDC. Send response to tkrieg@cox.net. How to Delete or Disable Active Fuel Management (AFM) When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. Are you saying that I am in the clear by a year and issues fixed? Very expensive repair too! How stupid do you have to be to whine like a welfare check cashing idiot when there are literally 3 or 4 different ways to totally disable AFM. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. Once the lifter has been damaged, the cam is probably also damaged. Next day, fired it up to take the the junk yard and it ran great. GM claims fuel improvements ranging from 5%-15% depending on the engine. 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. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. However, they are only functional on engines that usedAFM. Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Where can I buy a bolt to replace this relief valve ?? With 40000 Now you tell me AFM works and I will tell you; that you are full of shit! 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? More information can be found in the GM TSB bulletin number 10-06-01-008g. IMHO . I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? The 1 Big Problem People Are Having With the Chevy Silverado - MotorBiscuit Carbon Build-Up in the Intake Ports. Chevy Silverado V8 To V4 Problems - Tools Bible 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. , Production date on the vehicle is 04/2006 oddly enough. They lasted one year with big problems. bought at Brian Tooley Racing ! The 2nd went with a conventional valvetrain. I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. I have a 2013 1500 with the LC9. . Last GM Ill ever buy unless its got a diesel. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. GM Escalates Cylinder Deactivation With Dynamic Fuel - EngineLabs 8000 grand for the repair mine was 1,700.00 to repair, I had a 2004 small block v8(4.8) 331,000 miles on the truck,it was the usual on the maintenance front axles,etc. Because I want to. It depends on the failure mode of the lifter however, certainly worth a try. I had a 2007 Yukon XL 5.3 with the AFM. While the system sounded good, the microprocessors scrambled to activate, deactivate, and then reactivate cylinders as driving conditions quickly changed, causing the car to hesitate, buck, and stall. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. Cylinder Deactivation to the Rescue. Yes a poor design but a flaw ? 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. Gary, [] 3 engines didnt have AFM (Active Fuel Management) or VVT (Variable Valve Timing), so you dont have the expense of an AFM or VVT delete []. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Ive been reading, with disgust and concern of the lifter/cam situation. 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??? 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. There is a note in the TSB that states the bulletin doesnt apply to the LH6 used in the Rainier, Trailblazer, and Envoy due to a different design oil pan and AFM relief valve. Ketil, let us know what you find out. Did not help. 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. Pulled the inntake and replaced valleypan With all the solenoids. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . I have 217,000+ on it and it never fails meever! Better airflow reduces drag on the pistons and the associated pumping losses. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. NOT GOOD!! I ran 0W-20 no more the 5000 miles between changes. Had similar problems under warranty, no telling what they rigged me up with at the dealer. A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. GM Dynamic Fuel Management Cylinder Deactivation Technology - GM Authority Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. Loved the looks and interior and thought a I got a great deal at $6k even. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. Thanks for the detailed post! It actavated the lifter? Would doing the disabler option once I get it back be the right one? Why this happens is a more . Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. They may be able to find some of those missing ponies. Cylinder Deactivation & Variable Engine Displacement - LiveAbout they are known to become plugged. Can they be faulty? Hopefully he can free up the stuck/collapsed lifter. Cylinder deactivation | GM Truck Club Forum whith a disabler. 50,000 miles. 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. GM Active Fuel Management Cylinder Deactivation Technology - GM Authority It could be the filter screen under the oil sending unit. Also putting in a new transmission vs. rebuilding. Go Small? Common Problems With the Chevy Silverado 2.7L Turbo If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. All Gen IV engine blocks haveAFMtowers and oil passages cast in. Here are a few of the issues that you'll want to keep on your radar if you drive a 2017 Chevy or GMC vehicle with a 5.3L engine in it. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. I sold them when they were new. Would it be fine to go ahead with the AFM Disabler? It came back on last Wednesday starting with a flash. I have a Yukon 116k it now needs its 3rd set of lifters and cam. The biggest difference between the Vortec engines that used to be found in Chevy and GMC vehicles and the EcoTec engines found in them now are the fueling methods. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. I cant really tell from driving. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. The engine will switch to operating on fewer cylinders when cruising at a constant speed. Who knew? Love the truck so far. However, the fuel savings are not always as much as expected. it is the regulator guy! 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. All eight cylinders are now powering the engine. But not sure very annoying. 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. 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? Ive only put a straight pipe exhaust, intake, and a boost controller on it. But then she passed away from cancer. I would. TheAFMcylinders are opposite of one another in the firing order. No problems with any to this point. Now the problems back, I have 180k miles on it now. But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. Id wait until the warranty expires then disable. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? 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.