All Cylinders. im going to plug in a dissabler when im done to keep it V8 mode all the time. I ordered a electronic disabler for it today. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . The engine is running on only four cylinders. I recently bought a 2018 Silverado 5.3L with AFM. I have a 2013 1500 with the LC9. More information can be found in the GM TSB bulletin number 10-06-01-008g. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). Bought an 07 GMC Yukon 5.3 with the AFM, 87k. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Was a disaster then but a profitable disaster. Most will want to get rid of the AFM immediately. However, they are only functional on engines that usedAFM. Hello! 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. I asume low oil pressure cant make some of the DOD lifters to malfunction? Hi Brian, 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. Im always sorry to hear when people run into issues like these. The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). I love the car so far. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. The market for nonhybrid gasoline-powered vehicles is expected to fall by 20 percent during that time, but with tech like smarter cylinder deactivationin these upcoming GM V-8 trucks, for . they are known to become plugged. A 17 with 5.3. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. 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! I have 217,000+ on it and it never fails meever! The engine will switch to operating on fewer cylinders when cruising at a constant speed. [], [] way. According to some experts, switching to cylinder deactivation reduces the emissions high somewhere between 4 and 10%, which is a huge percentage of saving the air from pollution. If buying a tuner/chip which works best for that truck/engine? General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. They may be able to find some of those missing ponies. Pod. I got a 09 Chevy Ive had the 1 go out then the 7 about 2 weeks apart if I known what I know now I wouldve changed them all at once but now I have a misfire on cyl 4 but it came back in why are these lifters going out one at a time like this the 1st two that went out I was coming off the interstate an stabiltrack came on now the 4 misfired twice both times pullling out my driveway. In other words, the crankshaft and bearings were not visible. 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. Does the Pressure relief vavle ever go bad?? Just recently, GM announced a temporary closure. If I had wanted a 4 banger I would have bought one. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? Thats a tough call, if the warranty will cover itId let it run out. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? Have there been improvements in more recent model years employing AFM [2014 or newer]? I have the towing package on my 13 Tahoe LTZ. Looking to tear down myself. I havent has any lifter or cam issues. We chickened out though and just bolted the AFM solenoid plate onto the used engine. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. As it turned out one of the cam bearings was failing and causing the cam to wobble (my guess) which messed up the AFM and probably some other stuff too. Open to suggestions about best course of action. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. Install ls3 valley cover. This system is the most effective way to disable AFM. Not sure which direction to go from here. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Next day I drove my car to work and was fine but when I left work all lights came back on and terrible noise in the hood. Replaced all lifters. Thanks. Very confusing stuff out there. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. [] 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 []. Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. I ran 0W-20 no more the 5000 miles between changes. This basically deactivates the cylinder deactivation system. Can they be faulty? Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Or not because it is the cast iron block and not he aluminum block? I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. It came back on last Wednesday starting with a flash. Replace the cam or do the delete kit? GM get a clue! Have an intake and Borla exhaust. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? The trucks are only supposed to use two four. Pushing forward. 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. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. I told her to never pull the gadget out. I ran 0W-20 on more the 5000 miles between changes. Would doing the disabler option once I get it back be the right one? In the mean-time I found that you can keep the engine from going into 4 cyl mode by using the manual shift (if so equipped) and keeping it out of 6th gear. I guess I might have to call a dealership or GM to get a definite answer on this one. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Learn how your comment data is processed. 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. will feel like a jerk asking the clerk at lowes to cut them again. So now at 168 thousand miles it still runs good but gets bad gass mileage. There are a few potential causes for Chevy cylinder deactivation problems, including oil consumption problems, harmful to the environment, sludge issues, and lower cylinder temperatures. 1. If you left the original cam in, the AFM cylinders will be down about 25 lbs. 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. Told her that it would not last and that she needed to find a different way to get around. Our 2013 yukon with 47k miles just failed. Now I get 24 to 26 with deactivation locked out and full power. I ave noticed the point about excess oil spray. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? Why cant u just unplug the solenoid on back of engine by oil pressure sensor? 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. I have a 07 Yukon with 180K and no issues what so ever. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. 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. Corvette that does employ AFM. 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! 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? We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? Should I wait until the warranty runs out, or will that be too late to stop possible damage? What makes you think it was a design flaw ? In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. I always have done my oil changes on time, not sure about the people who owned it before me though. However, the fuel savings are not always as much as expected. []. Is there any potential down-side to doing this in other words, might this do more harm than good? If the 4th cylinder lifter has failed, would driving it damage the engine? Better airflow reduces drag on the pistons and the associated pumping losses. I have a 12 with 4.8 Silverado 75000 miles Are you saying that I am in the clear by a year and issues fixed? Replaced all 16 lifters due to collapsed lifter on CYl #4. I had to replace them all and the camshaft as well. We need availability of a replacement engine without the AFM. With 44, its a enormous Jon to remove the oil pan. There are 5.3 cylinder deactivation problems that can occur. [] 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. So for all of you that continue to complain about how bad these things are. 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. My 5.3 is. misfire or anything. I will be installing the AFM deactivator tonight when I get hoe. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . I just bought a 2018 Silverado. Its Chrysler and Ford. It is also known as Displacement on Demand (DoD) or cylinder deactivation. 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. You are correct. How about if they just let us have a manual transmission agains for fuel mileage? This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. Last GM Ill ever buy unless its got a diesel. Everything else looked good. Todays computers are faster so it does work. The engine has flex-fuel capability. This lowers the cost of building it [], [] aluminum block engine. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. 2011 Chevy Avalanche LTZ. 8000 grand for the repair mine was 1,700.00 to repair, I had a 2004 small block v8(4.8) 331,000 miles on the truck,it was the usual on the maintenance front axles,etc. Any help would be appreciated. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. I noticed this discussion mainly addresses Chevy Silverados and other trucks? I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. thank You so much! This is what I keep telling people. 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. I have read synthetic isnt good for AFM lifters. AFM sucks Im paying for a truck that has broke down twice replace the cam and lifters and now its broke down again 105000 miles never heard of that in a 350 Chevrolet. Its not possible to install them wrong? [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. If I put the Range module on, is that all I need to do, both now and long term? It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). Wed recommend a call to our partners at Summit Racing. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? They are taller and have special oil holes. Drives way better for my mostly paved road driving. 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. 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. Covers me to 100K. Driver reported this occurred suddenly while driving down the highway. 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. Yeh truck has 5237 miles on it The engine also had 799 or 243 casting heads which are closely related to the LS6. My daughters car had about 230,000 miles when she complained of the problem. 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. Hi. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. This happened on a camping trip with my kids last friday night. 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. changed oil , its all working now, but want to disable this sorry system. I also notice that it doesnt go into V4 when it is cold. "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. Where can I buy a bolt to replace this relief valve ?? He used seafoam and changed to synthetic oil. I will keep reading and take notes. Any truth to that? Pulled the inntake and replaced valleypan With all the solenoids. The oil is baked on to every component. Only running on drivers side cylinders. 4,7 plugs foul runs rough at idle. There are so many moving components in an engine these days as opposed to the past. I am trying to find out of this is true. . As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode.
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