Never did strand me on the side of the road way. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. Everything else looked good. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. The Definitive Guide to LS Engine Specs and LS Engine Upgrades, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance - OnAllCylinders, LS Engine Bore & Stroke Chart - OnAllCylinders, http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc, Range Active Fuel Management Disable Device, LS9 6.2L Engine Upgrade Guide: Expert Advice for LS9 Mods to Maximize Performance - OnAllCylinders, LMG 5.3L Engine Upgrade Guide: Expert Advice for LMG Mods to Maximize Performance - OnAllCylinders, L59 5.3L Engine Upgrade Guide: Expert Advice for L59 Mods to Maximize Performance - OnAllCylinders, L76 Car Engine Upgrade Guide: Expert Advice for L76 Car Engine Mods to Maximize Performance - OnAllCylinders, LH8 5.3L Engine Upgrade Guide: Expert Advice for L20 Engine Mods to Maximize Performance - OnAllCylinders, LH6 5.3L Engine Upgrade Guide: Expert Advice for LH6 Engine Mods to Maximize Performance - OnAllCylinders, LFA 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More - OnAllCylinders, LFA 6.0L Engine Upgrade Guide: Expert Advice for LFA Engine Mods to Maximize Performance - OnAllCylinders, LZ1 6.0L Engine Upgrade Guide: Expert Advice for LZ1 Engine Mods to Maximize Performance - OnAllCylinders, What the New LT2 Mid-Engine Corvette Reveals About the Future of GM LT Engines, All the Torques: How Summit Pro LS Truck Camshafts Help Truck Owners Maximize Performance, LMF 5.3L Engine Upgrade Guide: Expert Advice for LMF Mods to Maximize Performance - OnAllCylinders, L98 6.0L Engine Upgrade Guide: Expert Advice for L98 Mods to Maximize Performance, LQ4/LQ9 Engine Upgrade Guide: Expert Advice for LQ4 & LQ9 Mods to Maximize Performance - OnAllCylinders, Range AFM Disabler Reviews | Range Technology AFM Disabler 2019, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance, LM7 5.3L Engine Upgrade Guide: Expert Advice for LM7 Mods to Maximize Performance, LS4 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L76 6.0L Car Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L96 6.0L Engine Upgrade Guide: Expert Advice for L96 Mods to Maximize Performance, LC9 5.3L Engine Upgrade Guide: Expert Advice for LC9 Mods to Maximize Performance, LH6 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, LZ1 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, Chevy 4.3L Vortec Common Engine Problems - Vortec 4300 V6, https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-…, The 5 Most Common Chevy EcoTec3 5.3L Engine Problems, Chevy 6.0L Vortec Engine Problems - Common Vortec 6000 Problems, The 4 Most Common Chevy EcoTec3 6.2L Engine Problems, Gen 3 vs. Gen 4 LS Engines: How to ID Them (Video), Ask Away with Jeff Smith: Upgrades to GM LS 6.0L 4x4, LM4 5.3L Engine Upgrade Guide: Expert Advice for LM4 Mods to Maximize Performance, L33 5.3L Engine Upgrade Guide: Expert Advice for L33 Mods to Maximize Performance, Mailbag: Choosing an Engine Management System for an LS-Swapped '82 Olds Cutlass. The result is improved combustion chamber pressure as the piston approaches top . Thats a tough call, if the warranty will cover itId let it run out. I recently bought a 2018 Silverado 5.3L with AFM. 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. I would. I had one fail and it chattered the cam to the point that I had to Install a new cam. They dont so any better than domestics on mpgs. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. 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. 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. 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. This new lawsuit is essentially identical to the previous. Double digit MPGs in my 98 K1500 would be a dream lmao. Seems like the AFM disabler device is working for a number of people including myself as the 5.3l AFM engine has inherent design faults. When you drain the oil at three to four thousand miles its still clean. Definitely dont want to do anything to fix one problem and create another. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. 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 []. .or something similar . It is replaceable.. just remove oil pan and it will be on top at the filter. Truck ran fine before that. There is a note in the TSB that states the bulletin doesnt apply to the LH6 used in the Rainier, Trailblazer, and Envoy due to a different design oil pan and AFM relief valve. Driver reported this occurred suddenly while driving down the highway. 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. Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Take a look at what bmw did in its R1250 bike. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. More information can be found in the GM TSB bulletin number 10-06-01-008g. My question is: do I install the electronic disabler on the new engine to avoid future issues? []. Im curious as to how much tran fluid you put in? I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. The older truck gets 19 mpg the newer truck with fuel management gets 14. Fortunately I received a reducing in house shop hourly rate. This is my project car and will be my drive (about 5000 miles a year). There are so many moving components in an engine these days as opposed to the past. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. But not sure very annoying. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. 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. On one hand it has an aluminum block, which is nice. Yeh truck has 5237 miles on it Excess oil will be pushed out of the pressure relief valve into the oil pan. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. . With 40000 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??? Chris, when you did your delete, did you also change the cam at the same time? If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? There are so many more oil passages on engines these days. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. Lost number four Did gm make a non-dod version of the 5.3 with iron block that would work in my application? Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Just recently, GM announced a temporary closure. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. TheAFMsystem can be identified by its components. also in the pan is another AFM oil filter near the external engine oil filter. Change your oil. The biggest problem is nobody changes their oil on time. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. I just bought a 2015 5 3 17000 miles I was thinking about eliminating the 4-cylinder if I delete it with just the programmer will it hurt my motor? Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? Looking forward to input from the forum, Thank you. 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). If you ignore it and keep driving, odds are you will destroy the cam as well. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. 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 havent has any lifter or cam issues. do you fill to capacity anyways???? lol. 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. There may be an ignition related issue on that cylinder. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. I have a shop 39 yrs . Fouls those plugs. []. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. My 2002 I had over 298K on it with no engine related issues. Hi Mike, the metal shield you noticed is probably the windage tray. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. My 5.3 is. I ran 0W-20 on more the 5000 miles between changes. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. Cylinder Deactivation (Active Fuel Management) General Motors Active Fuel Management engine control system has the ability, under certain light load driving conditions, to provide maximum fuel economy by deactivating 4 of the engines 8 cylinders. 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. From what Ive read new and low mileage engines with no issues is ideal to do a afm delete, tune, or use of a disabler. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. AFM - active fuel management strategy which deactivates the lifters on specific . Covers me to 100K. I noticed this discussion mainly addresses Chevy Silverados and other trucks? I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? Cylinders two, three, and eight are all similar in cylinder deactivation. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. 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? A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. im going to plug in a dissabler when im done to keep it V8 mode all the time. hi brian when you replace the lifters do you have to change the guides also? WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. I am hoping this does the trick. 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. 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. GM switched over to the 4100 v-8 in 1982. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. I dont plan on installing the delete kit at this time. Will the plug in deactivater fix the oil consumption or will it cause more consumption? Having a hard time finding one .. Accept i only have 60K on my truck and it hasnt recovered. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. I called my service station and they told me to get it in ASAP. How long did it take? . Because its not just GM that have engine problems. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes This happened on a camping trip with my kids last friday night. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. Thanks for the advice Brian! Love the truck. 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. Given that, would you recommend buying one of the OBD-II devices to disable AFM? changed oil , its all working now, but want to disable this sorry system. 50,000 miles. 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! Its Chrysler and Ford. Basically rebuilt most of the engine while in the vehicle. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. Your email address will not be published. Because I want to. If the lifter actually fails so that the mechanism wont release, it wont work. 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. 2011 Chevy Avalanche LTZ. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] Also putting in a new transmission vs. rebuilding. Have not had a problem yet. Its a CA EMMISIONS TRUCK. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? Very confusing stuff out there. it is the regulator guy! Now I know why there wa such a push to get older ,less efficient vehicles off the roads. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. Send response to tkrieg@cox.net. That inherently less smooth operation requires additional NVH dampening. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. 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. Just shut AFM off. 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? [] they have a downside? It will show up as a misfire code in a cylinders 1,4,6, or 7. If someone didnt want to spend gas buy a Toyota. However, they are only functional on engines that usedAFM. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . All ready done valve job . A 14 gmc 5.3 Sierra 85000 miles The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. Since the tranny oil worked, you should now change the oil, right? Hi Grant is that disabler still working for you ? I will be installing the AFM deactivator tonight when I get hoe. 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 ! But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. 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. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. I have also heard that the oil pump is to be changed and I have also heard that it does not matter. But the problem at that time was the computer technology. will feel like a jerk asking the clerk at lowes to cut them again. Most will want to get rid of the AFM immediately. Thank you. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? It has AMF. Thank you again for the response. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. Hi my name is noel I am a mobile mechanic and I have a client that was having trouble with the lifters on a 2011 gmc yukon Denali 6.2 I placed the lifters after finishing I still had a problem with cylinder 8,6,3 rocker arms were not moving so I replaced the cam OEM part but still having miss fire on cylinder 6 what should I do to get rid of this problem, [] computer cannot switch over to four-cylinder mode. 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 just bought a 2018 Silverado with the 5.3 How do you know if the lifter has failed? Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. Another option is to plug it entirely if the AFM is already removed. thank You so much! With 44, its a enormous Jon to remove the oil pan. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. One must anticipate this. On the AFM lifters that dosnt work i have installed them With the oil hole Down! 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. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. General Motors has issued a service update for 2021 model year full-size truck and SUV models that are being shipped to dealerships and may be affected by valve lifter problems. Teflon coatings does not last. Im praying that my RangeTech buys me a few years. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. Install an AFM Delete Kit Most of the complaints show up in the 2009 to 2011 model years. Correct me if Im wrong- If such an item was available couldnt you then just replace the lifters in the 4 AFM cylinders and then just run a disabler or have your ECM/PCM reprogrammed to have AFM disabled permanently. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. Who knew? The detergent. Sometimes it will do it all the time and other times can drive it for 10 miles and then it starts but doesnt do it constantly when driving. The collapsed lifters will not engage the pushrods and both valves remain closed. Getting ready to diy for $450. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? 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. Hello. I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? In other words, the crankshaft and bearings were not visible. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. There is a chance the cam lobe was stressed and started to deteriorate. You cannot compare them to old 350s. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. 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! If the 4th cylinder lifter has failed, would driving it damage the engine? I have a 2014 Silverado with a 5-3. Nine plaintiffs filed the General . Theyre also notorious for bad cam tower oil leaks. When you eliminate the AFM system, the extra oil is no longer needed. I quites down to nothing after running for about a minute. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. 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. .IMHO . Yes, always change all the lifters at once. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Just pulled it down in the garage there was no other damage , luckily. The engine has flex-fuel capability. It was good for about 10 miles and started with same loud knock noise. Fortunately, the old engine hadnt been shipped back to the remanufacturer. Having it fixed now, just curious Seems like a problematic design. Found that all passenger side cylinders are not firing.
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