gm cylinder deactivation problemsis bill bruns still alive

Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? They lasted one year with big problems. How do you know if the lifter has failed? Can they be faulty? Get this, rebuild is only rings and maybe lifters. If someone didnt want to spend gas buy a Toyota. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. When cruising on the freeway (for example) in 4 cylinder mode and jumping on the throttle to pass or get out in the fast lane, there is CONSIDERABLE and annoying and dangerous lag, like 3 seconds, and this is a problem. The 2nd went with a conventional valvetrain. Would installing the Disabler solve this? I know a few guys with Tundras. Problems regarding Chevy 5.3L engines ticking noise and misfire. How about if they just let us have a manual transmission agains for fuel mileage? What was happening to the first is slowly (or quickly in your case) happening to the others. I dont know where to being to look for the problem. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. 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. How long did it take? 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. With the nipple, or without? I quites down to nothing after running for about a minute. Any help would be appreciated. 1. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. You also need the disabler installed in your obd connector. 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. I am wondering the same thing. i have a 2007 suburban 6.0 and the number 4 intake lifter took a dive.i have already started to disassemble the engine as i plan on replacing all the lifters and reassemble the engine as i never had any other problems with it. I wont bother with blocking the relief valve. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. All the time. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. Brian, I have been reading your article about the AFM. I was getting ~ 30 mpg, so I love that. any help? 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . The Hit and Miss Nature of Cylinder Deactivation Systems In other words, the crankshaft and bearings were not visible. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. On one hand it has an aluminum block, which is nice. Or not because it is the cast iron block and not he aluminum block? AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. 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 []. It has has 9000 miles and no lifter or other issues or codes so far. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. Easier said than done. If buying a tuner/chip which works best for that truck/engine? 50,000 miles. Ditto , never buy a throw away vehicle again is my recommendation and my fix . Im crossing my fingers it does the trick! You were lucky that it worked. 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. I dont plan on installing the delete kit at this time. 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. The engine will switch to operating on fewer cylinders when cruising at a constant speed. I am hoping this does the trick. There are so many moving components in an engine these days as opposed to the past. The 1 Big Problem People Are Having With the Chevy Silverado - MotorBiscuit HP tuners is not for someone like me that doesnt know how to use it and from what I read neither the range nor diablo plug and play device will work since the buicks pcm files are different than all other GM vehicles that came with afm because it was tuned in house at gms performance division. Nine plaintiffs filed the General . 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. So I researched and got an AFM disabler. How to Delete or Disable Active Fuel Management (AFM) on GM Engines Only thing I noticed with the oil consumption issue. 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. Keith, were happy to help. Dont drive it if you have a dead cylinder due to afm failure. 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. Any guidance would surely be appreciated. I have a 2013 1500 with the LC9. misfire or anything. [], [] way. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. []. Then again, it should have never been controlling those solenoids. I can literally drive from Seattle to Redding CA on one tank. 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. 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. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. 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? Would doing the disabler option once I get it back be the right one? Ayush Srivastava With 40000 Looking forward to input from the forum, Thank you. I hate it. They dont so any better than domestics on mpgs. I went with the new motor for the warranty. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. CHANGE YOUR OIL!!!!! Now Im here tring to figure out what to do. Thanks for your help. It is also known as Displacement on Demand (DoD) or cylinder deactivation. Most will want to get rid of the AFM immediately. I have seen more internal engine failures in the last 5 years or so than I have in the first 15 years in the business. I contacted service manager in Gastonia, NC and he was kind enough to tell me the whole history of the problem.. EPA required better fuel mileage and less emissions and GM, Ford and Honda(V-6) came up with this failed AFM system. GM claims fuel improvements ranging from 5%-15% depending on the engine. 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 07 Yukon with 180K and no issues what so ever. Once the lifter has been damaged, the cam is probably also damaged. Just one or two. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. the body is in great shape. You cannot compare them to old 350s. Hi Grant is that disabler still working for you ? You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. At this state, a disabler would probably do what you need it to do. Does the Pressure relief vavle ever go bad?? If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. It has the orings in place, that seals the towers. Ill Never Ever buy another gm. 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. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? 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. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. It has AMF. 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. On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . Cylinders two, three, and eight are all similar in cylinder deactivation. A tuner can often fix that as well by giving it some more ignition advance in these regions. chevrolet - How does cylinder deactivation work? - Motor Vehicle https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. Then I guess I have to spend a bunch of money and get the delete kit. Traded it with 180K miles and did not experience any problems. I would. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! Whats the next step? Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Please report back if you have any issues, but I think you are in good shape. Cylinder deactivation | GM Truck Club Forum What type of ODBII gadget did you use? I would appreciate any feedback. Is this due to the AFM being shut off? I have always loved Ford and Chevys , I dont like this Vehicle not one bit, starring shaft has to be lubed or it whines, front A arms has done been replaced, tapping in motor, leaf springs has been lubed, retorqued, put completely new leaf springs back in on the rear , grease all down from rims to body of truck, you have to clean often,console shakes as if milk shakes in console which later they also put rubber bushings in front of coils of shocks ( front end) .You lock it down in 44 it s metal to metal , As of now Im at 32,000 done gone threw all the arbitrator laws depending on how it goes? I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. 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. 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. One the other hand, it came without AFM, VVT, or flex fuel capability. I have a noise in the engine but it seems to go away when revved up. Is this the shield you referred to in a past post? Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. Oil 0w or 5w -20 How to Deactivate AFM, DFM, MDS, and Start/Stop To Prevent - Holley Mine did at the exact same time. The oil collapses the plunger inside the lifter. The lifter seems to recharge whenever the truck sits for some time. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! Can you tell me what needs to be done with the VVT? I have a 2014 Silverado with a 5-3. My fear now is not will it happen but when! Lost number four September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. It is usually first noticed during highway driving. This is my second Avalanche and I never had any issues with either of them. 2 15 with 5.3 Sierras both with 100k and This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. Thank you for your time. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? Brian, thank you for the quick response. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? .or something similar . They have plastic casing, so you can imagine what will happen with aged plastic. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? She had driven it for a couple of months that way. The LZ1 was upgraded with AFM and []. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. Hello. A 14 gmc 5.3 Sierra 85000 miles 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 . Junk . 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. Learn how your comment data is processed. 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 ! 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? My 5.3 is. TheAFMsystem can be identified by its components. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. If AFM has been deleted, its common just to use a Dorman drain plug (m14 x 1.5) to remove the pressure relief valve entirely. GM Active Fuel Management Cylinder Deactivation Technology - GM Authority 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. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . Had similar problems under warranty, no telling what they rigged me up with at the dealer. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. Any problems to watch out for?Did you replace the VLOM? Was a disaster then but a profitable disaster. It actavated the lifter? If I put the Range module on, is that all I need to do, both now and long term? Would never take it on a long trip. The engine had 200K miles. [], [] as the LS engine familys hybrid engine in trucks and SUVs. Took it to the dealer and was told I had a collapsed lifter. I had purchased an extended warranty when I bought the truck new. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. So I did the job one more time. Then changed the oil. There are no changes in the valves or the springs. I noticed this discussion mainly addresses Chevy Silverados and other trucks? Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. But then she passed away from cancer. It also has an electrical connector on the back. I have no clue what to do now. If I were to put a 2006 5.3L in a 2007 Avalanche and buy the unit to plug into my OBD2 port would it work? It is being covered under warranty since I only have 72,000 miles on it. Don't even get me started on the shortened life of the cooling, starting and charging systems. Replace the cam or do the delete kit? Then had to drive the truck back to Tampa from Cheifland Fl. Change your oil. It will show up as a misfire code in a cylinders 1,4,6, or 7. These trucks cost too much to have a terrible product. will feel like a jerk asking the clerk at lowes to cut them again. 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 am considering the same. Sylinder one lost compression on my 09 5,3. [], [] LS Tech: How to Delete VVT or DisableAFM []. I have a 2008 Buick Lacrosse super that I am having a hard time finding a tuner or a tune shop that can turn off the afm. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. Should I wait until the warranty runs out, or will that be too late to stop possible damage? GM offers the following diagnostic steps in determining if this is the problem. After reading these forums Im a little concerned about my decision to stay with GM. I havent has any lifter or cam issues. No other V-8 truck of similar weight can do that (except another GM with AFM). Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. Seafoam with syn oil change only fixed for a week. A 17 with 5.3. The collapsed lifters will not engage the pushrods and both valves remain closed. It uses a M14 x 1.5 thread plug like Dorman 65217. 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. GM Releases Valve Lifter Service Update For V8 Engines

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