But not sure very annoying. 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. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. I have no other engine problems and Id like to fix the issue. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. 190k on the motor always ran AMSOIL full synth since new. If you ignore it and keep driving, odds are you will destroy the cam as well. 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. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? I am confused about the plug in disabler. Didnt change exhaust nor tune so likely no change in power/torque. Are there errors or something only the dealer can clear? This is in response to pretty much everyone. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Thanks for your help. Ketil, let us know what you find out. But after reading this thread, Im a little concerned about the long-term reliability. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. thx Brian, Knock on wood I drive a 2011 silverado 44 Ltd with the 5.3 AFM/DOD not tuned out or delete being used and have experienced no problems or any sign of problems for that matter juat rolled over 210,000 all original factory parts would you suggest I tune it out or juat let it ride I change my oil religiously and also use lucas products for all aspects of my motor. I would just have the AFM disabled (tuned out) then. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. If I put my truck in manual 5, it doesnt try to go into V4 mode. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? Then I guess I have to spend a bunch of money and get the delete kit. It could be the filter screen under the oil sending unit. A 17 with 5.3. Yes thats true. But then she passed away from cancer. There may be an ignition related issue on that cylinder. Basically rebuilt most of the engine while in the vehicle. The result is improved combustion chamber pressure as the piston approaches top . I went with the new motor for the warranty. Once the failure has occurred, the AFM shut off methods other than that probably wont work. 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? Did Obama make them do this? 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. I dont plan on installing the delete kit at this time. 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. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. Can they be faulty? I am leaning heavily on installing the AFM disabler. . Carbon Build-Up in the Intake Ports. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. 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. We were getting a code that the cam position sensor was not functioning properly. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. . They layed over night in engine oil before instalation. I guess they also went to aluminum blocks in 2007, not sure if that has anything to do with this issues thanks for the advice! Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. Have a lifter problem on my 2010 5.3 Silverado. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. All eight cylinders are now powering the engine. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. []. Thanks. I have been assuming this is just a slow to pump-up lifter or lifters. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. But it also restricts passages that the oil runs through. Who knew? I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. Just pulled it down in the garage there was no other damage , luckily. Love the truck so far. 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. I would say maybe 5% of my customers keep up on their oil changes. Then again, it should have never been controlling those solenoids. Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . 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. any help? 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?? Now the problems back, I have 180k miles on it now. [] 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 []. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. What makes you think it was a design flaw ? of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. 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. Then changed the oil. There are no changes in the valves or the springs. 330-630-0240. Ill Never Ever buy another gm. Run it and let it soak overnight. changed oil , its all working now, but want to disable this sorry system. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. Its ribbed with solenoids on the underside. Not sure which direction to go from here. I tried the trans fluid in the oil. I havent has any lifter or cam issues. We chickened out though and just bolted the AFM solenoid plate onto the used engine. Is there any reaction to the disabler when pulling a boat or trailer? 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. Having it fixed now, just curious Seems like a problematic design. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. There has been a lifter noise since I bought the truck 1 year ago. Will the plug in deactivater fix the oil consumption or will it cause more consumption? The 2nd went with a conventional valvetrain. , Production date on the vehicle is 04/2006 oddly enough. Just one or two. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. He stated if I continued to exceed 4500 RPM it would blow the lifters out. Install the disabler when you get your Yukon back and it will remain in good working order. Friend will send to me from Arizona. Yes, always change all the lifters at once. .or something similar . But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. hi brian when you replace the lifters do you have to change the guides also? The LZ1 was upgraded with AFM and []. I read something the other day which I found to be funny. [], [] way. I cant really tell from driving. Corvette that does employ AFM. Have not had a problem yet. Hi Grant is that disabler still working for you ? The market for nonhybrid gasoline-powered vehicles is expected to fall by 20 percent during that time, but with tech like smarter cylinder deactivationin these upcoming GM V-8 trucks, for . Hi Mike, the metal shield you noticed is probably the windage tray. 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. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. My 5.3 has a vin code of O. NOT GOOD!! Ditto , never buy a throw away vehicle again is my recommendation and my fix . A 14 gmc 5.3 Sierra 85000 miles The older truck gets 19 mpg the newer truck with fuel management gets 14. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. For fun, he runs his 427-powered C5 Z06 in ECTA land-speed racing, at OPTIMA street car events, and at a mix of autocross, drag racing, and track days. 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. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. I always have done my oil changes on time, not sure about the people who owned it before me though. I can literally drive from Seattle to Redding CA on one tank. it is the regulator guy! I just did the delete and replaced the cam as well. My question is: do I install the electronic disabler on the new engine to avoid future issues? 1. New plugs and wires. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. Thanks for the advice Brian! On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . Excess oil will be pushed out of the pressure relief valve into the oil pan. Very confusing stuff out there. []. I ran 0W-20 no more the 5000 miles between changes. Welcome to socialism folks . I want to put a AFM disabler in it what all do I need to have done. 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. Was a disaster then but a profitable disaster. RANGE TECNOLOGY.COM. It actavated the lifter? I have read synthetic isnt good for AFM lifters. This really sucks. has 92,000 miles and was just told I have cam and lifter failure. Hi. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. The car runs great apart from the shuddering at those speeds. Our 2013 yukon with 47k miles just failed. 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. The collapsed lifters will not engage the pushrods and both valves remain closed. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. Open to suggestions about best course of action. 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. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. The oil is baked on to every component. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. I am hoping this does the trick. Number 7 cylinder lifters stops moving when truck starts. Is this an issue only with GM SUVs and trucks, or does it include cars too? Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. I had privilege to work on some of that garbage they never did work . The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. Brian, thank you for the quick response. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. 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? Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . Replacing engine due to issues caused by AFM. All ready done valve job . I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. It only has about 9k miles on it. Did not help. The original version sprayed oil on the cylinder walls and increased oil consumption. 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? 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. Ive been reading, with disgust and concern of the lifter/cam situation. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). Their tech guys have seen it all and may have some thoughts on this as well. If I had wanted a 4 banger I would have bought one. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. 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. Its got a hundred forty-five thousand miles on it. Please report back if you have any issues, but I think you are in good shape. What would you do if you were in my situation? Why cant u just unplug the solenoid on back of engine by oil pressure sensor? The engine also had 799 or 243 casting heads which are closely related to the LS6. You may want to update your post. A 14 gmc 5.3 Sierra 85000 miles I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. I have 4 GMCs in my driveway right now only one with AFM its always popping DTCs, 06 Yukon (not AFM)never had a light in 12 years! Have misfire code and engine has what I would call a surge while driving. I ordered a electronic disabler for it today. I got the AMF disabler anyway and so far so good. Verified over hundreds of trips, makes no sense. If the 4th cylinder lifter has failed, would driving it damage the engine? 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. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? they are known to become plugged. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . Thank you for your time. Some guys have been able to use a tool through the top with the cover off to get it to release. It prevents the computer from switching over to four-cylinder mode. The most common issue GM vehicle owners with AFM report is increased fuel consumption. Dod is the biggest failure sence the 8-6-4 caddie in 1981. If you left the original cam in, the AFM cylinders will be down about 25 lbs. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. Call chevy.They should being paying most of that. Since no air can get in or out, four cylinders provide no power. Lost number four So now at 168 thousand miles it still runs good but gets bad gass mileage. I loved this rtuck until this happened!! The trucks are only supposed to use two four. Just recently, GM announced a temporary closure. Does the Pressure relief vavle ever go bad?? This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. This is my project car and will be my drive (about 5000 miles a year). 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. 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. So I did the job one more time. The only problem is the extra spray on the cylinder models if a deflector isnt used and this can show up as increased oil consumption. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. Ayush Srivastava 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. My Wifes 17 Buick with afm was my attempt to get back to gm. Pod. IMHO . It has the orings in place, that seals the towers. There is a chance the cam lobe was stressed and started to deteriorate. The wife however found this deal on an Envoy Denali . what deleter (if thats a real word) have you heard good things about. My 2002 I had over 298K on it with no engine related issues. What type of disabler did you go with? 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. 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 . 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. A tuner can often fix that as well by giving it some more ignition advance in these regions. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? Another option is to plug it entirely if the AFM is already removed. When you drain the oil at three to four thousand miles its still clean. I have had some say that it is the valves and others say that it is the cats plugged. Still have no power. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. After taking a $3.6h bath on the lifter/valve work and doing a little research, how can GM allow a problem like this AFM continue from 07 to present? I would appreciate any feedback. You were lucky that it worked. Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. Fortunately I received a reducing in house shop hourly rate. Also putting in a new transmission vs. rebuilding. Had similar problems under warranty, no telling what they rigged me up with at the dealer. I ran 0W-20 on more the 5000 miles between changes. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. Love the truck. Have an intake and Borla exhaust. Looking to tear down myself. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. You are correct. 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. 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??? I plan on getting a tuner to disable the AFM. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. "The idea behind cylinder deactivation is that when you're cruising down the freeway and there's low load, the engine can turn off half the cylinders and in theory burn half as much gas. Put everything back together proper torque, gakets, valve seals, etc. It will show up as a misfire code in a cylinders 1,4,6, or 7. The engine will switch to operating on fewer cylinders when cruising at a constant speed. In other words, the crankshaft and bearings were not visible. Oil flows to the special lifters through theAFMtowers. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. I didnt have lifters fail, I had the 4 cylinders 1,4,6,7 have such blow by that my choice was a valve and piston job or a new motor. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. You will get codes thrown if the afm is physically removed without telling the ECM you did so. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. More information can be found in the GM TSB bulletin number 10-06-01-008g. Im crossing my fingers it does the trick! the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. My dad ended up running seafoam through it and some transmission fluid, changed the oil pressure sensor which I definitely think was bad and also cleaned out the little screen and he said it was so full of junk and metal scraps.

Hobby Lobby Train Set Play Table Instructions, Jose Chepito Areas Height, Honokohau Falls Trail, A Command Economic System Is Characterized By Quizlet, Articles G