With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. Hello! Once the failure has occurred, the AFM shut off methods other than that probably wont work. Install ls3 valley cover. Not sure which direction to go from here. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. 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. 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. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). Then had to drive the truck back to Tampa from Cheifland Fl. 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. Number 7 cylinder lifters stops moving when truck starts. Have an intake and Borla exhaust. If the 4th cylinder lifter has failed, would driving it damage the engine? Replaced all 16 lifters due to collapsed lifter on CYl #4. 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. Truck ran fine before that. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. You can unplug the sensor on the vacuum booster and it will fool the computer into thinking there is a high demand on the engine and shut down the AFM system but you will have a Check engine light in your face for doing so . Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? I have already dropped a lot of money on this truck (08 suburban). Pod. 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. Excess oil will be pushed out of the pressure relief valve into the oil pan. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. I tried the trans fluid in the oil. No it runs fine on sylinder one but not on 6 or 7!!! Easier said than done. It works . any help? Ayush Srivastava Where can I buy a bolt to replace this relief valve ?? It is also known as Displacement on Demand (DoD) or cylinder deactivation. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . Take a look at what bmw did in its R1250 bike. i just bought a 2018 Silverado with the 5.3 The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. Put an S&B cold air intake on last week with huge oiled filter and it made a big improvement in throttle response and it appears possibly a slight improvement in mileage. Every one of these engine will have a lifter fail, this is a travesty! I am confused about the plug in disabler. 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. Keith, were happy to help. What would you do if you were in my situation? Brian, I have the same question as Scott. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. Then I guess I have to spend a bunch of money and get the delete kit. Wed recommend a call to our partners at Summit Racing. 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). In four-cylinder mode, they act like air springs and allow for smooth operation. Your email address will not be published. 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 want to put a AFM disabler in it what all do I need to have done. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. Carbon Build-Up in the Intake Ports. 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. 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. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. This system was originally used in early 1980s Cadillacs. All eight cylinders are now powering the engine. Welcome to socialism folks . No problems with any to this point. I just took a long trip and it used 1.5 quarts of oil. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. the body is in great shape. Thank you. 330-630-0240. Everything was fine for two weeks, ow customer complains s it same noise it made as before. Oil 0w or 5w -20 I ave noticed the point about excess oil spray. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. 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. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? I just got new warranty engine and dont want this issue again? What type of ODBII gadget did you use? I have the towing package on my 13 Tahoe LTZ. . Sylinder one lost compression on my 09 5,3. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. It is being covered under warranty since I only have 72,000 miles on it. If someone didnt want to spend gas buy a Toyota. 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 ! I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. I cant really tell from driving. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? I own a reputable repair shop. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. Would you get enough power to drive at freeway speeds? I hate it. What was happening to the first is slowly (or quickly in your case) happening to the others. The engine will switch to operating on fewer cylinders when cruising at a constant speed. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. I dont know where to being to look for the problem. I am trying to prevent same issue. There may be an ignition related issue on that cylinder. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. [] engines is that when VVT (variable valve timing) appeared and was later followed by AFM (which is Active Fuel Management, when the engine deletes four cylinders under light load) both of these packages drastically affect []. I am leaning heavily on installing the AFM disabler. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. Our 2013 yukon with 47k miles just failed. Ill Never Ever buy another gm. If buying a tuner/chip which works best for that truck/engine? 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? According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. 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. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. When you don't need the full power of the engine, it provides better fuel economy." The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Having it fixed now, just curious Seems like a problematic design. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. If I put my truck in manual 5, it doesnt try to go into V4 mode. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy If you dont have VVT, you could use part number NAL-12561721 (LQ9) along with a 4-pole 3-bolt 2005 Corvette cam sprocket p/n NAL-12586481 to make it compatible with your ECM. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. 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. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. 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. . do you fill to capacity anyways???? A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. I am not in a position to have a new cam and lifters installed but Im also not in a position to not having a running truck! My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. Here's what you need to know: 1. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. All New lifters were from AC delco. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. Dod is the biggest failure sence the 8-6-4 caddie in 1981. After reading these forums Im a little concerned about my decision to stay with GM. 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. My question on a 2007 Chevy Tahoe 5.3 AFM Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? I have a Yukon 116k it now needs its 3rd set of lifters and cam. $8500.00 fix. 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. 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. CAM motion says no just have to disable the AFM and VVT with a stock tune as the camshaft is not an aggressive camshaft but a drop in. I was looking at the 08 escalade hybrid with dod on its 6.0 so wondering if the delete would contribute to the high oil consumption and therefore would adding the deflector be a good idea. 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. This lowers the cost of building it [], [] aluminum block engine. I had privilege to work on some of that garbage they never did work . I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? 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. Brian, thank you for the quick response. I have read synthetic isnt good for AFM lifters. I have 217,000+ on it and it never fails meever! 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. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. 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. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. This is in response to pretty much everyone. 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. Have there been improvements in more recent model years employing AFM [2014 or newer]? Have not had a problem yet. I am hoping this does the trick. 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. Now I get 24 to 26 with deactivation locked out and full power. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. the extra oil isnt needed. It actavated the lifter? I recently took a long trip and it burned 1.5 quarts of oil. Required fields are marked *. Love the truck. [] Here is a guide on how to turn off AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Guide to disabling AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Here is an article on how to deactivate AFM. [], [] LS Tech: How to Delete VVT or DisableAFM []. I know I felt the same way. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. 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. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! https://www.cargurus.com/Cars/Discussion-t30884_ds822284. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes 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. [], [] as the LS engine familys hybrid engine in trucks and SUVs. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. 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. How is that an improvement. So I researched and got an AFM disabler. The oil is baked on to every component. Everything else looked good. Hi Mike, the metal shield you noticed is probably the windage tray. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. 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. So now at 168 thousand miles it still runs good but gets bad gass mileage. You also need the disabler installed in your obd connector. Its got a hundred forty-five thousand miles on it. Theyre also notorious for bad cam tower oil leaks. I recently bought a low mileage 2013 Silverado and the lifters collapsed. Whats the next step? Junk . the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades. There are 5.3 cylinder deactivation problems that can occur. Does the Pressure relief vavle ever go bad?? Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. Is the Pressure relief valve replaceable? Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. 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. 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. [], [] rugged iron block 6.0L came with VVT, but without Active Fuel Management, which saves you the cost of an AFM delete [], [] The LH6 engine is a 5.3L Gen. IV aluminum engine that replaced the LM4 in 2005. You cannot compare them to old 350s. 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. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. Brian, we have a 2007 Yukon Denali in our shop with a 6.2L v-8 that has suffered a lifter failure with camshaft damage. The exhaust valve remains open during the intake stroke and closes just before BDC. When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. 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. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. What the biggest reported problem with Chevy Silverados? Cylinder deactivation works to save fuel, but it may not be for the reasons you think. Change your oil. Should I buy one to disable the V4 mode? The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. stalled in a certain way a warning wouldn be a bad idea. On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . Had nothing but trouble out of it. Having a hard time finding one ..
gm cylinder deactivation problems