gm cylinder deactivation problems

Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. It has 8,000 miles on it. They should let us the better mileage. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. has 92,000 miles and was just told I have cam and lifter failure. Any problems to watch out for?Did you replace the VLOM? 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. Traded it with 180K miles and did not experience any problems. Then again, it should have never been controlling those solenoids. 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. My daughters car had about 230,000 miles when she complained of the problem. Open to suggestions about best course of action. How about if they just let us have a manual transmission agains for fuel mileage? Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. He unstuck it and I took it for a drive and same thing happened. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. I cant really tell from driving. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. Just shut AFM off. One the other hand, it came without AFM, VVT, or flex fuel capability. 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 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. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. 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. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . 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. 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. 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. Only wish Id did my homework, nothing but issues, from 14,000 miles it starts this motor noise,as if lifters at cold starts, let set up for 8 hrs same noise, this noise is on the right side of engine, it lasts 5 seconds but never heard this until we had this cold spell in the state low temperatures or it was just time for this to start? No problems with any to this point. Billy, there is some interesting trivia here on the L92. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. Im curious as to how much tran fluid you put in? I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? The car runs great apart from the shuddering at those speeds. Very confusing stuff out there. It works . But after reading this thread, Im a little concerned about the long-term reliability. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. I could just transfer over the AFM lifter cover, but it is really nasty on the bottom side & I do not want to risk damaging this replacement engine if it is loaded with debris from the lifter & camshaft failure. There are so many more oil passages on engines these days. The collapsed lifters will not engage the pushrods and both valves remain closed. Definitely dont want to do anything to fix one problem and create another. .IMHO . 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. Brian, thank you for the quick response. , Production date on the vehicle is 04/2006 oddly enough. 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. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. What makes you think it was a design flaw ? The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. Then had to drive the truck back to Tampa from Cheifland Fl. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. 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. It does seem that when they start goingthey go quickly. 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. 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. Truck has an active P0300 code and runs very rough. Another option is to plug it entirely if the AFM is already removed. Last GM Ill ever buy unless its got a diesel. There are no changes in the valves or the springs. Where can I buy a bolt to replace this relief valve ?? Pulled the inntake and replaced valleypan With all the solenoids. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? I did noticed the oil consumption but it was rare that I would have to add oil. Are you saying that I am in the clear by a year and issues fixed? I ran 0W-20 on more the 5000 miles between changes. I recently bought a low mileage 2013 Silverado and the lifters collapsed. 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 []. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. 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. Some drivers want V8 power under their foot at all times. 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 just took a long trip and it used 1.5 quarts of oil. Engine oil pressure is fine. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. 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 []. I drive the same 320 mile trip every two weeks and drive the same route and full tank. Just recently, GM announced a temporary closure. Every one of these engine will have a lifter fail, this is a travesty! General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. Thank you again for the response. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. I am hoping this does the trick. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. All Gen IV engine blocks haveAFMtowers and oil passages cast in. Battery was unplugged for a week.. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. The valve itself is part number W0133-2574213. The dealer in Rockhill, SC when asked only said they had not had a problem. How is that an improvement. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. Ive been reading, with disgust and concern of the lifter/cam situation. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). Im confused from the write up about the plug in. I still get a P0336 code every once in a while but still good to drive around town. 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. Since it is not costing me anything out of pocket, I did not go with the Delete Kit (did not want to spend the money). Id wait until the warranty expires then disable. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. If you left the original cam in, the AFM cylinders will be down about 25 lbs. 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. Does the Pressure relief vavle ever go bad?? Very expensive repair too! Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. Toyota will be my next truck unless GM owns up and makes wright with consumers. 1. But the problem at that time was the computer technology. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM 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. Getting ready to diy for $450. Apparently all passkey III keys are not the same,, I bought one that said for 2006 impala assuming all pk3 would be the same, and I could not get it programmed in my saab 9-7,, so how Im waiting on ones that specially said for saab 9-7. hoping they will work. Would installing the Disabler solve this? I just got new warranty engine and dont want this issue again? 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 Batten, followed by several years developing performance pistons at Wiseco Piston Co. Today, Brian develops performance parts for Summit Racing Equipment and is a regular OnAllCylinders contributor. 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. Keith, were happy to help. My question on a 2007 Chevy Tahoe 5.3 AFM 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. [], [] as the LS engine familys hybrid engine in trucks and SUVs. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . 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. You also need the disabler installed in your obd connector. The write up confuses me. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. 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! is it still working good since you have done that with the trans fluid? What was happening to the first is slowly (or quickly in your case) happening to the others. Does the disabler prevent the engine damage in the first place? Thank you. There may be an ignition related issue on that cylinder. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . Drives way better for my mostly paved road driving. These trucks cost too much to have a terrible product. My Wifes 17 Buick with afm was my attempt to get back to gm. Im always sorry to hear when people run into issues like these. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. Everything was fine for two weeks, ow customer complains s it same noise it made as before. 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. They may be able to find some of those missing ponies. 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. I dont know where to being to look for the problem. Wed recommend a call to our partners at Summit Racing. Wow, thanks for the wisdom,, i checked my VIN Code (position #8, M=LH6) and my 2005 Saab 9-7x does have the LH6 motor with iron block, Are you sure its only 2007 & newer motors? Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. A 14 gmc 5.3 Sierra 85000 miles Nine plaintiffs filed the General . The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. AFM - active fuel management strategy which deactivates the lifters on specific . I have an 07 Yukon with over 180K. I have an 07 Silverado 1500 ltz. Replaced all lifters. I have a 12 with 4.8 Silverado 75000 miles We were getting a code that the cam position sensor was not functioning properly. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. Is there any reaction to the disabler when pulling a boat or trailer? 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? Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. But not sure very annoying. Hello. All ready done valve job . The Jury is still out on the Gen. 5s but the warranty could be an issue. Why would GM ever produce such problems with such little to gain. 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. 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. This really sucks. 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. There are two ways to disable or delete Active Fuel Management on your GM or Chevy Gen IV LS or LS-based Vortec engineone is to install an AFM Disabler, and the second is to install an AFM Delete Kit. We chickened out though and just bolted the AFM solenoid plate onto the used engine. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. I have a 2014 Silverado with a 5-3. With 40000 I couldnt agree with you less, yet I respect your opinions. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. Pushing forward. Fortunately I received a reducing in house shop hourly rate. Thanks. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. 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). Looking to tear down myself. Truck ran fine before that. Don't even get me started on the shortened life of the cooling, starting and charging systems. We believe this confirmed that the AFM has never been operating in this vehicle. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. I got the AMF disabler anyway and so far so good. The computers had not evolved enough to control the sytem. As you said, the ECM was never seeing the AFM so I think youre good to go. So I researched and got an AFM disabler. This video covers the steps youll need to take before upgrading to a larger [], I am installing a complete delete system, just wondering what it will do if dont plug the oil pressure relief valve? The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? Now Im here tring to figure out what to do. This should be added to your earlier model if you experience oil consumption. All Cylinders. Yes, always change all the lifters at once. 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. 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. Had nothing but trouble out of it. I own a reputable repair shop. Disable the afm. But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. I loved this rtuck until this happened!! Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. 2 15 with 5.3 Sierras both with 100k and 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 told her to never pull the gadget out. With 40000 If the 4th cylinder lifter has failed, would driving it damage the engine? Or not because it is the cast iron block and not he aluminum block? Their tech guys have seen it all and may have some thoughts on this as well. No problems with any to this point. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. 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? They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. So I did the job one more time. Only running on drivers side cylinders. I am considering the same. Thank you. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. 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. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. But then she passed away from cancer. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? 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. It seems this tough engine has everything incorporated into it. Pod. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy It actavated the lifter? Change your oil. However, the fuel savings are not always as much as expected. My fear now is not will it happen but when! Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? GM claims fuel improvements ranging from 5%-15% depending on the engine. in your opinion will this work, i really dont see any reason it wouldnt. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. . As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. While it does still use the GM Active Fuel Management cylinder deactivation technology that caused a plethora of issues on the gen-four Vortec 5300 engines, it seems that GM has solved the issues related to excessive oil consumption. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. Everything else looked good. Accept i only have 60K on my truck and it hasnt recovered. Im servicing a 2011 Chevrolet 5.3 with AFM. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. You are correct. Run it and let it soak overnight. Just one or two. It is usually first noticed during highway driving. When you drain the oil at three to four thousand miles its still clean. I have an 07 Yukon with 230k on the engine. Hopefully he can free up the stuck/collapsed lifter. Any advice that you could offer would be great. "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. Theyre also notorious for bad cam tower oil leaks. Your email address will not be published. Sylinder one lost compression on my 09 5,3. In other words, the crankshaft and bearings were not visible. More information can be found in the GM TSB bulletin number 10-06-01-008g. Once I get it back, could I install the Disabler safely. I just bought a 2015 5 3 17000 miles I was thinking about eliminating the 4-cylinder if I delete it with just the programmer will it hurt my motor? 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. Its ribbed with solenoids on the underside. Yes thats true. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? I have the towing package on my 13 Tahoe LTZ. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . I speak from some experience. However, they are only functional on engines that usedAFM. What type of ODBII gadget did you use? A tuner can often fix that as well by giving it some more ignition advance in these regions. Help appreciated. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. How do you know if the lifter has failed? After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. Logic says that it should not as the ECM isnt programmed to use AFM, but will it see a lack of resistance from no solenoid pack plugged in? The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Did Obama make them do this? please respond with your opinion. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. . This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. Just pulled it down in the garage there was no other damage , luckily. Brian, I have been reading your article about the AFM. We need availability of a replacement engine without the AFM.

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