I hate it. Dummy Me thought gm learned its lesson in 1981 but they never did and I Too am stuck with a Buick thats just waiting to self destruct. A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. Billy, there is some interesting trivia here on the L92. Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. Thankfull for any ideeas! Can I (should I) also change to a standard volume oil pump? One the other hand, it came without AFM, VVT, or flex fuel capability. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. 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. With 40000 From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. You cannot compare them to old 350s. The motor I pulled was a 2007 LY5 with about 77k on it. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. What type of ODBII gadget did you use? My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. Well, they move a couple of times after startup thats all.Asume its the same on syl 7 on the other side.Disconected the Connector to the solenoids, no difference. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. Cylinder Deactivation: What Is It and How Does It Help Save Fuel? 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. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. If possible, will simply not using VVT provide a powerful,good running engine? It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. Traded it with 180K miles and did not experience any problems. GM Making New Trucks Without Cylinder Deactivation Due To Chip - Motor1 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. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. But the problem at that time was the computer technology. 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. how many miles do you have on your engine? It also has an electrical connector on the back. .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. Ketil, let us know what you find out. Your email address will not be published. lol. It only has about 9k miles on it. 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. Verified over hundreds of trips, makes no sense. 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. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. Take a look at what bmw did in its R1250 bike. They have plastic casing, so you can imagine what will happen with aged plastic. I recently bought a 2018 Silverado 5.3L with AFM. Because your Saab is mechanically similar to the Trailblazer, wed suggest that you are correct and no changes need to be made to the relief valve. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. What was happening to the first is slowly (or quickly in your case) happening to the others. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. GM should recall every vehicle with this terrible design flaw! I have a 2011 GMC Sierra 1500 with the 5.3. The only solution is to replace the entire cylinder head. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. Having a hard time finding one .. There is a chance the cam lobe was stressed and started to deteriorate. The oil collapses the plunger inside the lifter. 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. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! If you ignore it and keep driving, odds are you will destroy the cam as well. Its ribbed with solenoids on the underside. 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. Active Fuel Management (AFM) is a trademarked General Motors technology that improves gas mileage by shutting down half of the cylinders under light-load conditions to reduce fuel consumption. 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. Thank you. Have a lifter problem on my 2010 5.3 Silverado. 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. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. Any thoughts or suggestions would be appreciated. They took the engine down today found so much damage inside they ordered a new engine from Detroit. Was thinking maybe I could trick the ruck into thinking the engine was not warmed up, however, this might cause some problems for other processes, such as mix ratio and timing. if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage . If so what would the vin code be? This really sucks. Cylinder deactivation | GM Truck Club Forum I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. Driver reported this occurred suddenly while driving down the highway. My Wifes 17 Buick with afm was my attempt to get back to gm. Have there been improvements in more recent model years employing AFM [2014 or newer]? Brian, I have the same question as Scott. 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. Then again, it should have never been controlling those solenoids. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. 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). Bought an 07 GMC Yukon 5.3 with the AFM, 87k. The detergent. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. Changing the sensor didnt help. [], [] LS Tech: How to Delete VVT or DisableAFM []. The biggest problem is nobody changes their oil on time. [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Go Small? Common Problems With the Chevy Silverado 2.7L Turbo Thank you. Stopped at nearest gas station and found I was a quart low on oiladded oil and lights eventually went off and luckily we made it the 5 hour drive home. I have a 2014 Silverado with a 5-3. Your 1981 caddy was your fmu I got glue inside of it and it stuck the potentiometer for stochiometric if you get a new fmu or you pick the glue out of the potentiometer you can set it to stoichiometric and get a lot better fuel mileage as far as your truck why dont you look at the intake manifold I got a crack or a vacuum leak somewhere for gas mileage thank you truck service, Near 1981 its your fmu it has glue inside the potentiometer you have to either RNR it for a new one or pick the glue out of the potentiometer for stochial magic is the only variable resistor inside that you can turn with a screwdriver once you get the glue out of it itll read still kill metric just be careful and then you can set it properly with your own meter on your monitoring your O2 sensor and then on your Silverado thingy your 5.3 just check the intake manifold for lakes Ill get you a better gas mileage if you dont have any intake cuz theyre plastic and they crack and stuff like that other than that yeah thats it, Larry Jenkins, I have a 17 GMC Sierra 6.2 SLT, I got 25 to 27mpg regularly with 93 gas and cylinder deactivation. 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. Where can I buy a bolt to replace this relief valve ?? 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 just bought a 2018 Silverado with the 5.3 You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. Help appreciated. hi brian when you replace the lifters do you have to change the guides also? I cant really tell from driving. 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 Thanks. Do you think I can still disable AFM? If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. Most will want to get rid of the AFM immediately. Your email address will not be published. Looking to tear down myself. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. Once the failure has occurred, the AFM shut off methods other than that probably wont work. My 5.3 is. 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. Sylinder one lost compression on my 09 5,3. Brian, thank you for the quick response. I want to put a AFM disabler in it what all do I need to have done. 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. Gary, [] 3 engines didnt have AFM (Active Fuel Management) or VVT (Variable Valve Timing), so you dont have the expense of an AFM or VVT delete []. Cylinder Deactivation to the Rescue. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. I tried the trans fluid in the oil. I wear hearing aids, but I thought I heard more engine noises, but after checking the gas cap, the light went out for a week. Replaced all lifters on passenger side as well as pushrods for even wear. Would never take it on a long trip. CHANGE YOUR OIL!!!!! A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. The exhaust valve remains open during the intake stroke and closes just before BDC. No it runs fine on sylinder one but not on 6 or 7!!! It has has 9000 miles and no lifter or other issues or codes so far. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. AFM/DFM Disabler - Range Technology Pulled the inntake and replaced valleypan With all the solenoids. any help? There are 5.3 cylinder deactivation problems that can occur. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. There is no light on my dash or anything that indicates the system is active or exists, so its very confusing, Im still not sure if my vehicle has it or not. Fouls those plugs. 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. . [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). 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. My daughters car had about 230,000 miles when she complained of the problem. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Its got a hundred forty-five thousand miles on it. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. (Non-AFM engines have a smooth cover.). A 17 with 5.3. However I do have 7 year bumper to bumper warranty that covers this problem if I start to get lifter problems over the next 2 years.. On the other hand if get the AFM disabler installed I am pretty sure that I void the warranty from what I read on the policy. It was well researched and tested back in the late seventies and eighties . Why would GM ever produce such problems with such little to gain. Brian, I have an 07 Silverado 1500 ltz. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. How about if they just let us have a manual transmission agains for fuel mileage? All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. . We believe this confirmed that the AFM has never been operating in this vehicle. do you fill to capacity anyways???? 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 cost of just rings $4,000.00, [] Disable your Chevy AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] like front timing cover, knock sensor location, cylinder head style (cathedral ports), AFM (Active Fuel Management), and other components are key clues to which engine family youre looking []. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . If under the truck while parked and it is doing it it sounds like it is towards the back of motor. Love the truck. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? All Cylinders. Below youll see references to the L99 as a result. They layed over night in engine oil before instalation. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. I am wondering the same thing. It does seem that when they start goingthey go quickly. If I had wanted a 4 banger I would have bought one. I guess I might have to call a dealership or GM to get a definite answer on this one. 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. They dont so any better than domestics on mpgs. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. AFM - active fuel management strategy which deactivates the lifters on specific . The 2nd went with a conventional valvetrain. []. Did not help. They may be able to find some of those missing ponies. Chris, when you did your delete, did you also change the cam at the same time? My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. It has 8,000 miles on it. 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. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. Next day, fired it up to take the the junk yard and it ran great. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? Truck ran fine before that. I noticed this discussion mainly addresses Chevy Silverados and other trucks? They should let us the better mileage. Found that all passenger side cylinders are not firing. I had to replace them all and the camshaft as well. 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. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. I have a 2013 1500 with the LC9. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . If I had been able to push the issue and get the time, I would have done the full fix at first without the hassle. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. 50,000 miles. Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? I recently bought a low mileage 2013 Silverado and the lifters collapsed. . She had driven it for a couple of months that way. Thats not all bad because it saves the cost of an AFM delete kit. [], [] way. Engines with AFM use a high-volume oil pump. 1981 Cadillac V 864. Call chevy.They should being paying most of that. Now you tell me AFM works and I will tell you; that you are full of shit! Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. I service plenty of these vehicles with AFM, and the ones I have to open up the engine for repair because of a failure doesnt surprise me anymore. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? 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. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? Im servicing a 2011 Chevrolet 5.3 with AFM. On one hand it has an aluminum block, which is nice. Its a CA EMMISIONS TRUCK. 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. Last GM Ill ever buy unless its got a diesel. Covers me to 100K. I read something the other day which I found to be funny. Since no air can get in or out, four cylinders provide no power. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM My 2002 I had over 298K on it with no engine related issues. Any truth to that? Removing ignition lock cylinder when it won't turn at all So for all of you that continue to complain about how bad these things are. Cost about $250, but it is not fool proof. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Drives way better for my mostly paved road driving. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] So I did the job one more time. 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. It seems this tough engine has everything incorporated into it. 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. Ive heard the Brand name Range thrown around in other forums, This is how mine started outthen 6 months later on the highway the service stabilitrak light and flashing engine light came on. For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). Having it fixed now, just curious Seems like a problematic design. Who knew? To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. Then it takes out the lifter again and again until you bite the bullet and replace the cam. It is usually first noticed during highway driving. It has plenty of oil pressure and I put all new lifters in it. You also need the disabler installed in your obd connector. 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? I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. GM uses 3 different styles all are engine specific. Junk . Im confused from the write up about the plug in. There is a good chance that some of the drivers side lifters decided to go.