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Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM Traded it with 180K miles and did not experience any problems. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. AFMengines use special lifters for cylinders 1, 4, 6, and 7. So now at 168 thousand miles it still runs good but gets bad gass mileage. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. 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. the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. [], [] as the LS engine familys hybrid engine in trucks and SUVs. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. Whats the next step? 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! I have 217,000+ on it and it never fails meever! http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. How long did it take? Chevrolet 5.3 Engine Issues and Recommendations Your email address will not be published. The engine had 200K miles. Double digit MPGs in my 98 K1500 would be a dream lmao. It is also known as Displacement on Demand (DoD) or cylinder deactivation. My daughters car had about 230,000 miles when she complained of the problem. 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. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . Im curious as to how much tran fluid you put in? Does the Pressure relief vavle ever go bad?? I drive the same 320 mile trip every two weeks and drive the same route and full tank. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). 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. Also, it is the easiest way [], [] for the 2010 Chevy Camaro SSis also a Gen IV 6.2L aluminum-block V8, but with the addition of Active Fuel Management and Variable Valve Timing. I was getting ~ 30 mpg, so I love that. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. If you installed a performance cam intended for a car, it may be bleeding off some low end compression. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. Todays computers are faster so it does work. If the 4th cylinder lifter has failed, would driving it damage the engine? Why this happens is a more . i just bought a 2018 Silverado with the 5.3 GM Dynamic Fuel Management Cylinder Deactivation Technology - GM Authority It replaces the AFM components with standard parts. I recently bought a 2018 Silverado 5.3L with AFM. My concern is if I leave the non-AFM lifter cover in place & have nothing to plug the 5 pin AFM solenoid connector into, will I get a MIL? But if you dont like it. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. RANGE TECNOLOGY.COM. I had a 2007 Yukon XL 5.3 with the AFM. . Most of all, my concern is reliability. It could be the filter screen under the oil sending unit. That might show up if you cut the filter and looked for debris in the pleats. 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. The original version sprayed oil on the cylinder walls and increased oil consumption. Is Your 5.3L V8 Engine Eating Up Too Much Oil? We - GM Parts Online All Gen IV engine blocks haveAFMtowers and oil passages cast in. They should let us the better mileage. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. whith a disabler. The 1 Big Problem People Are Having With the Chevy Silverado - MotorBiscuit Ive been reading, with disgust and concern of the lifter/cam situation. Required fields are marked *. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. I know a few guys with Tundras. Do you think I can still disable AFM? Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. Not sure what else it can be. If the lifter actually fails so that the mechanism wont release, it wont work. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. I speak from some experience. Cylinders two, three, and eight are all similar in cylinder deactivation. Would doing the disabler option once I get it back be the right one? Friend will send to me from Arizona. I just took a long trip and it used 1.5 quarts of oil. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. 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 []. 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 have also heard that the oil pump is to be changed and I have also heard that it does not matter. Ditto , never buy a throw away vehicle again is my recommendation and my fix . If buying a tuner/chip which works best for that truck/engine? If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. 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 lowers the cost of building it [], [] aluminum block engine. All Cylinders. Send response to tkrieg@cox.net. 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. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. Who knew? One alternative is to swap in one of the larger 6.0 non-AFM truck cams. Because its not just GM that have engine problems. There are so many moving components in an engine these days as opposed to the past. I loved this rtuck until this happened!! Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. The 5 Most Common Chevy EcoTec3 5.3L Engine Problems You also need the disabler installed in your obd connector. I dont know where to being to look for the problem. The exhaust valve remains open during the intake stroke and closes just before BDC. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. No movement on the rocker arms. Number 7 cylinder lifters stops moving when truck starts. Dont drive it if you have a dead cylinder due to afm failure. My point is that the engine likely on uses dod a small percentage of the time so can not really imagine that the delete causes any more issue than normal which may be the high oil consumption but do all of these engines with dod consume a lot of oil? I hate it. 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? Had similar problems under warranty, no telling what they rigged me up with at the dealer. changed oil , its all working now, but want to disable this sorry system. Should I wait until the warranty runs out, or will that be too late to stop possible damage? Found that all passenger side cylinders are not firing. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. What type of ODBII gadget did you use? 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. Excess oil will be pushed out of the pressure relief valve into the oil pan. It came back on last Wednesday starting with a flash. Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. 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. We believe this confirmed that the AFM has never been operating in this vehicle. I may just do that Vic. Yes, always change all the lifters at once. If you ignore it and keep driving, odds are you will destroy the cam as well. No it runs fine on sylinder one but not on 6 or 7!!! 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. 1. 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. If a shop pulled a DTC code P0300 and found AFM to be the issue, it may not be too late to try the disabler. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] Thanks for your help. 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. I ran 0W-20 on more the 5000 miles between changes. Hi Mike, the metal shield you noticed is probably the windage tray. lol. If so what would the vin code be? 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 ! They layed over night in engine oil before instalation. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. Then again, it should have never been controlling those solenoids. I have a 07 Yukon with 180K and no issues what so ever. But after reading this thread, Im a little concerned about the long-term reliability. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. so the trans fluid worked for you then? Thank you for your time. Took the heads off again. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. How to Fix GM's Cylinder Deactivation Problems Thats a tough call, if the warranty will cover itId let it run out. I have no other engine problems and Id like to fix the issue. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. How to Delete or Disable Active Fuel Management (AFM) on GM Engines Now you tell me AFM works and I will tell you; that you are full of shit! Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. GM Escalates Cylinder Deactivation With Dynamic Fuel - EngineLabs I got the AMF disabler anyway and so far so good. Fouls those plugs. It was good for about 10 miles and started with same loud knock noise. Given maximum engine power is not required during the majority of everyday driving, AFM works to deactivate engine cylinders when they are not needed, such as when cruising on the highway, thus. It is being covered under warranty since I only have 72,000 miles on it. Yes thats true. Accept i only have 60K on my truck and it hasnt recovered. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). I can literally drive from Seattle to Redding CA on one tank. Take a look at what bmw did in its R1250 bike. I have a shop 39 yrs . 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. [], [] way. It is usually first noticed during highway driving. Any truth to that? You cannot compare them to old 350s. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. The computers had not evolved enough to control the sytem. Would it be fine to go ahead with the AFM Disabler? 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. they are known to become plugged. the extra oil isnt needed. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? Everything was fine for two weeks, ow customer complains s it same noise it made as before. Seafoam with syn oil change only fixed for a week. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. Yeh truck has 5237 miles on it Im servicing a 2011 Chevrolet 5.3 with AFM. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. 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. It does seem that when they start goingthey go quickly. Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. 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". As you said, the ECM was never seeing the AFM so I think youre good to go. The oil-pressure controlled system that operates the special lifters is VERY prone to failure, if the oil is not changed on time, OR if the wrong oil is used. Keith, were happy to help. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? Basically rebuilt most of the engine while in the vehicle. Lost number four Im confused from the write up about the plug in. Most of the complaints show up in the 2009 to 2011 model years. Im crossing my fingers it does the trick! hi brian when you replace the lifters do you have to change the guides also? Then it takes out the lifter again and again until you bite the bullet and replace the cam. The most common issue GM vehicle owners with AFM report is increased fuel consumption. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? One must anticipate this. Billy, there is some interesting trivia here on the L92. Next day, fired it up to take the the junk yard and it ran great. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. The problem:. How did your turn out? 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). Regardless of the AFM solenoid being commanded on or off. Problems regarding Chevy 5.3L engines ticking noise and misfire. Driver reported this occurred suddenly while driving down the highway. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. 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. 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. On one hand it has an aluminum block, which is nice. What the biggest reported problem with Chevy Silverados? Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? 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. There is a good chance that some of the drivers side lifters decided to go. 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. PDF GM LS AFM Deactivation Lifter Issues - Melling For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? Our 2013 yukon with 47k miles just failed. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? Pulled the inntake and replaced valleypan With all the solenoids. Most will want to get rid of the AFM immediately. i have a 2007 suburban 6.0 and the number 4 intake lifter took a dive.i have already started to disassemble the engine as i plan on replacing all the lifters and reassemble the engine as i never had any other problems with it. Any thoughts or suggestions would be appreciated. Then had to drive the truck back to Tampa from Cheifland Fl. 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. 2011 Chevy Avalanche LTZ. It depends on the failure mode of the lifter however, certainly worth a try. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! The engine will switch to operating on fewer cylinders when cruising at a constant speed. Toyota has their own problems. It only has about 9k miles on it. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. Welcome to socialism folks . The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. "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. It also mentions a valve cover replacement with revised PCV valve design. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! I ave noticed the point about excess oil spray. At this state, a disabler would probably do what you need it to do. 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. She started to have the lifter problem again after 60,000 miles more. Carbon Build-Up in the Intake Ports. I am trying to prevent same issue. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Pulled right valve cover an rockers on syl 6 dont move. Don't even get me started on the shortened life of the cooling, starting and charging systems. They may be able to find some of those missing ponies. I have the towing package on my 13 Tahoe LTZ. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. Now Im here tring to figure out what to do. [] they have a downside? I have a 12 with 4.8 Silverado 75000 miles Delete the AFM, buy a tuner/chip, take it to a performance place and get an actual tune done that fixes it, replace the AFM lifters with non AFM type, change other engine components with thisetc..etc..etc??? It has 8,000 miles on it. Thanks for the advice Brian! A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. How to Delete or Disable Active Fuel Management (AFM) Hello. 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.