It is usually first noticed during highway driving. 2 15 with 5.3 Sierras both with 100k and Thank you for your time. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. As a side note, Range Technologies recommends removing the disabler between visits to the dealer as they will need to access the OBD-2 port. The 1 Big Problem People Are Having With the Chevy Silverado - MotorBiscuit Getting ready to diy for $450. Any help would be appreciated. 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. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. CHANGE YOUR OIL!!!!! A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. Take a look at what bmw did in its R1250 bike. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. This reduces expense when you build it [], [] intake, and a cable-driven throttle body, plus Im also installing Trick Flows VVT and AFM delete kits. Thank you again for the response. Sylinder one lost compression on my 09 5,3. I have an 07 Silverado 1500 ltz. chevrolet - How does cylinder deactivation work? - Motor Vehicle This should be added to your earlier model if you experience oil consumption. Definitely dont want to do anything to fix one problem and create another. I have a 12 wit 4.8 Silverado 75000 miles 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? Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. I know a few guys with Tundras. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. 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. Friend will send to me from Arizona. Its Chrysler and Ford. Nine plaintiffs filed the General . A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. Yes thats true. 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). $8500.00 fix. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. I love the car so far. There may be an ignition related issue on that cylinder. Ayush Srivastava I have a 2013 1500 with the LC9. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. Your email address will not be published. Open to suggestions about best course of action. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. I can literally drive from Seattle to Redding CA on one tank. 1981 Cadillac V 864. The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. The engine also had 799 or 243 casting heads which are closely related to the LS6. On the AFM lifters that dosnt work i have installed them With the oil hole Down! [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. Next day, fired it up to take the the junk yard and it ran great. The engine has flex-fuel capability. Weve written some articles on the various Vortec engine upgrade paths, such as this one on LQ4 and LQ9it discusses some of the better options for choosing a cam intended for use in a truck. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. TheAFMsystem can be identified by its components. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. A custom tune by a knowledgeable tuner with access to a chassis dyno will pay a lot of other dividends other on top of turning off afm and VVT. in your opinion will this work, i really dont see any reason it wouldnt. Disable the afm. I wont bother with blocking the relief valve. Looking forward to input from the forum, Thank you. I know I felt the same way. All New lifters were from AC delco. Would it be fine to go ahead with the AFM Disabler? I have 1999 5.3 Silverado that gets 19-20 miles to the gallon all the time this shit pile with dod only gets 14 miles to the gallon. is it still working good since you have done that with the trans fluid? GM switched over to the 4100 v-8 in 1982. 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. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes 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? of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. Any truth to that? It is replaceable.. just remove oil pan and it will be on top at the filter. bought at Brian Tooley Racing ! []. I cant really tell from driving. 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. 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 want to put a AFM disabler in it what all do I need to have done. 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 you left the original cam in, the AFM cylinders will be down about 25 lbs. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. [] 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. I have already dropped a lot of money on this truck (08 suburban). My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. 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. 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. The biggest problem is nobody changes their oil on time. 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. We believe this confirmed that the AFM has never been operating in this vehicle. Really could use some pointers. So I did the job one more time. Please report back if you have any issues, but I think you are in good shape. The older truck gets 19 mpg the newer truck with fuel management gets 14. If the lifter actually fails so that the mechanism wont release, it wont work. Did Obama make them do this? Lost number four I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. Toyota has their own problems. 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? It also mentions a valve cover replacement with revised PCV valve 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? The lifter seems to recharge whenever the truck sits for some time. 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 asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. Replaced all lifters. GM get a clue! I would just have the AFM disabled (tuned out) then. With 44, its a enormous Jon to remove the oil pan. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. I just took a long trip and it used 1.5 quarts of oil. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . She had driven it for a couple of months that way. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. I ave noticed the point about excess oil spray. 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. We figured we already had the intake manifold off to install the engine, why run the risk of MIL only to have to removed the intake manifold again without being paid. I have a shop 39 yrs . Because its not just GM that have engine problems. 2011 Chevy Avalanche LTZ. 1. GM claims fuel improvements ranging from 5%-15% depending on the engine. Truck has an active P0300 code and runs very rough. I am a long time GM fan but after reading how they messed up the 5.3 ( I had a fantastic 2003 Z72 off road) Ill look else ware for my next vehicle. Im servicing a 2011 Chevrolet 5.3 with AFM. I will be installing the AFM deactivator tonight when I get hoe. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . Engines with AFM use a high-volume oil pump. I have a noise in the engine but it seems to go away when revved up. I have a 12 with 4.8 Silverado 75000 miles AFMlifters have a history of failing and oil consumption can be a problem. I ran 0W-20 on more the 5000 miles between changes. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. 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. Driver reported this occurred suddenly while driving down the highway. Ever since that which was Feb/March 2020 i get a intermittent rattle does not do it all the time and I am not getting any codes i.e. Just one. She started to have the lifter problem again after 60,000 miles more. I ordered a electronic disabler for it today. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. Thats not all bad because it saves the cost of an AFM delete kit. Why would GM ever produce such problems with such little to gain. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. Everything was fine for two weeks, ow customer complains s it same noise it made as before. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. Most of all, my concern is reliability. Its not possible to install them wrong? I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Regards, I have a 2014 Chevy Z51 [w/dry sump oiling etc.] Ill Never Ever buy another gm. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. Whats the next step? https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. 2 15 with 5.3 Sierras both with 100k and I had the same issue and had to have the AFM information deleted from the computer and the car tuned. 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. I also have 08 Burb, but have different symptoms (high oil consumption, blue exhaust smoke at start, and now a really rough start after sitting overnight). It prevents the computer from switching over to four-cylinder mode. I quites down to nothing after running for about a minute. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. thank You so much! Now Im here tring to figure out what to do. I just got new warranty engine and dont want this issue again? She drove it for another 35,000 and it went out again. I havent has any lifter or cam issues. . I had privilege to work on some of that garbage they never did work . If buying a tuner/chip which works best for that truck/engine? Took it to my dads and he tore things apart and found that I had a lifter that was stuck. As the problem gets worse, youll hear a lifter tick and eventually you may see clearance between the pushrod and the rocker which will quickly destroy the cam. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. Hi Mike, the metal shield you noticed is probably the windage tray. Replaced all 16 lifters due to collapsed lifter on CYl #4. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). Bought an 07 GMC Yukon 5.3 with the AFM, 87k. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. We were getting a code that the cam position sensor was not functioning properly. I am confused about the plug in disabler. Id wait until the warranty expires then disable. Verified over hundreds of trips, makes no sense. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. Pulled the inntake and replaced valleypan With all the solenoids. I dont plan on installing the delete kit at this time. Runs better than new now and no more oil consumpsion!! It is currently at the dealer having a new long block installed under warranty. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). But then she passed away from cancer. He stated if I continued to exceed 4500 RPM it would blow the lifters out. Don't even get me started on the shortened life of the cooling, starting and charging systems. What Is Hemi MDS? - MotorTrend Billy, there is some interesting trivia here on the L92. I did noticed the oil consumption but it was rare that I would have to add oil. Every one of these engine will have a lifter fail, this is a travesty! Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. 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 . I would say maybe 5% of my customers keep up on their oil changes. Basically rebuilt most of the engine while in the vehicle. I have an 07 Yukon with 230k on the engine. Love the truck. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. GM should recall every vehicle with this terrible design flaw! The engine had 200K miles. Thankfull for any ideeas! I have a 2011 GMC with over 162,000 miles on it and it runs great! Put everything back together proper torque, gakets, valve seals, etc. Have not had a problem yet. 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. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. I wii be using this truck to haul a camper for full time RV living and am thinking of a tuner to shut off AFM and maximize performance and economy. Seafoam with syn oil change only fixed for a week. Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. 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". The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. GM Dynamic Fuel Management Cylinder Deactivation Technology - GM Authority Just pulled it down in the garage there was no other damage , luckily. will feel like a jerk asking the clerk at lowes to cut them again. I ran 0W-20 no more the 5000 miles between changes. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? Is there any potential down-side to doing this in other words, might this do more harm than good? Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. 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? AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. Any thoughts or suggestions would be appreciated. It essentially turns your V8 engine into a V4 which saves fuel. Any problems to watch out for?Did you replace the VLOM? I still get a P0336 code every once in a while but still good to drive around town. GM offers the following diagnostic steps in determining if this is the problem. Theyre also notorious for bad cam tower oil leaks. I drive the same 320 mile trip every two weeks and drive the same route and full tank. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. 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. stalled in a certain way a warning wouldn be a bad idea. 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? I have an 07 Yukon with over 180K. Your email address will not be published. Chris, when you did your delete, did you also change the cam at the same time? Will the plug in deactivater fix the oil consumption or will it cause more consumption? Is this due to the AFM being shut off? PDF Service Bulletin Bulletin No.: 20-NA-038 Date: March, 2020 We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Not sure what else it can be. Had nothing but trouble out of it. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. misfire or anything. Then it takes out the lifter again and again until you bite the bullet and replace the cam. Brian, Does the disabler prevent the engine damage in the first place? There is a good chance that some of the drivers side lifters decided to go. Can they be faulty? The engine is running on only four cylinders. They are taller and have special oil holes. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM The system uses solenoids to deliver oil pressure to control. For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). You are correct. Im confused from the write up about the plug in. 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. One must anticipate this. If someone didnt want to spend gas buy a Toyota. Or not because it is the cast iron block and not he aluminum block? They have plastic casing, so you can imagine what will happen with aged plastic. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. The Cylinder Deactivation system, known as the Active Fuel Management system by GM, shuts off some of the cylinders when extra power is not needed which improves fuel economy. I recently bought a 2018 Silverado 5.3L with AFM. How about if they just let us have a manual transmission agains for fuel mileage? Given that, would you recommend buying one of the OBD-II devices to disable AFM? On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . i just bought a 2018 Silverado with the 5.3 Is the Pressure relief valve replaceable? Send response to tkrieg@cox.net. This system is the most effective way to disable AFM. If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. So I researched and got an AFM disabler. 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. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. Some guys have been able to use a tool through the top with the cover off to get it to release. If possible, will simply not using VVT provide a powerful,good running engine? The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? I also notice that it doesnt go into V4 when it is cold. This is what I keep telling people. GM Releases Valve Lifter Service Update For V8 Engines 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. A 14 gmc 5.3 Sierra 85000 miles The oil is baked on to every component. Im curious as to how much tran fluid you put in? My 5.3 is. Although the last oil change I had they offered a more expensive oil that would let me go every 5,000 miles and when this happened I was almost at 4,000 so needless to say I will never do that again. 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? GM Active Fuel Management Cylinder Deactivation Technology - GM Authority Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. The oil pump is high volume, but there are a lot of people that dont change it and rely on the pressure valve to keep the volume manageable. Wed recommend a call to our partners at Summit Racing. 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. When I first bought my newer truck with fuel management, the GM tech at the dealership told me; if I wanted the engine to live a long life keep the RPMs below 4500. It works . We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? im going to plug in a dissabler when im done to keep it V8 mode all the time. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. []. Cylinders two, three, and eight are all similar in cylinder deactivation. Ive only put a straight pipe exhaust, intake, and a boost controller on it. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? The original version sprayed oil on the cylinder walls and increased oil consumption. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? It has the orings in place, that seals the towers. If you think GM pioneered cylinder deactivation, guess again I have a 2014 Silverado with a 5-3. It has plenty of oil pressure and I put all new lifters in it. I guess I might have to call a dealership or GM to get a definite answer on this one. You were lucky that it worked. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. You will get codes thrown if the afm is physically removed without telling the ECM you did so. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on.
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gm cylinder deactivation problems