im going to plug in a dissabler when im done to keep it V8 mode all the time. No clue what to do. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. 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. 50,000 miles. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. Also putting in a new transmission vs. rebuilding. Any advice that you could offer would be great. A 17 with 5.3. 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. I recently bought a low mileage 2013 Silverado and the lifters collapsed. Thank you for your time. I am having that done today on my 08 Suburban and its only costing me $225. It has has 9000 miles and no lifter or other issues or codes so far. I call it active obama fuel management .A scam . I already ordered the parts to replace myself and remove the code. Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors.It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy.Estimated performance on EPA tests shows a 5.5-7.5% improvement in fuel economy. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. This is in response to pretty much everyone. Have there been improvements in more recent model years employing AFM [2014 or newer]? HELP, I have 2005 envoy that runs makes lifter noise then dies in about 30 seconds then I started it one day and it ran with little noise for 5 min started next day and it starts and dies again got heads off was told I could put ls 3 lifters in is that true or is there something else I could do thanks Duane. any help? I would say maybe 5% of my customers keep up on their oil changes. The original version sprayed oil on the cylinder walls and increased oil consumption. Have misfire code and engine has what I would call a surge while driving. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. 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! https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. 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. Please report back if you have any issues, but I think you are in good shape. Any truth to that? Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. It seems this tough engine has everything incorporated into it. 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. yep, you are 100% Right, I called a local saab shop and they filled me in, in 2005 the trailblazer and clones have DOD (displacement on demand), My next issue is getting extra ignition keys on the cheap. The LFA was upgraded with AFM and [], [] improvement over AFM, DFM has 17 different cylinder firing patterns and switches seamlessly between them to provide just []. Accept i only have 60K on my truck and it hasnt recovered. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. Was a disaster then but a profitable disaster. But if you dont like it. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. It also mentions a valve cover replacement with revised PCV valve design. has 92,000 miles and was just told I have cam and lifter failure. []. 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? Thanks. Can you tell me what needs to be done with the VVT? We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? "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. Not sure which direction to go from here. . Its ribbed with solenoids on the underside. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! I would appreciate it if you let me know how you make out. He used seafoam and changed to synthetic oil. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. I dont know where to being to look for the problem. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. Another option is to plug it entirely if the AFM is already removed. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. I wont bother with blocking the relief valve. My Wifes 17 Buick with afm was my attempt to get back to gm. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. Sylinder one lost compression on my 09 5,3. We chickened out though and just bolted the AFM solenoid plate onto the used engine. The 2nd went with a conventional valvetrain. [] they have a downside? AFM Sucks!!! so the trans fluid worked for you then? If under the truck while parked and it is doing it it sounds like it is towards the back of motor. It is replaceable.. just remove oil pan and it will be on top at the filter. [], [] LS Tech: How to Delete VVT or DisableAFM []. The engine is running on only four cylinders. stalled in a certain way a warning wouldn be a bad idea. Seafoam with syn oil change only fixed for a week. It does seem that when they start goingthey go quickly. Logic says that it should not as the ECM isnt programmed to use AFM, but will it see a lack of resistance from no solenoid pack plugged in? This is what I keep telling people. Their tech guys have seen it all and may have some thoughts on this as well. She started to have the lifter problem again after 60,000 miles more. GM offers the following diagnostic steps in determining if this is the problem. Thank you. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. 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. They should let us the better mileage. I couldnt agree with you less, yet I respect your opinions. I have successfully used a gadget that plugs into the ODBII. It is being covered under warranty since I only have 72,000 miles on it. Mine did at the exact same time. At this state, a disabler would probably do what you need it to do. I have an 07 Yukon with 230k on the engine. Everything was fine for two weeks, ow customer complains s it same noise it made as before. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? I have a noise in the engine but it seems to go away when revved up. If possible, will simply not using VVT provide a powerful,good running engine? Yes thats true. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. I have an 07 Yukon with over 180K. The oil collapses the plunger inside the lifter. Disable the afm. I guess they also went to aluminum blocks in 2007, not sure if that has anything to do with this issues thanks for the advice! Put everything back together proper torque, gakets, valve seals, etc. 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. How did your turn out? My 5.3 is. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. Who knew? 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. 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. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. Are you saying that I am in the clear by a year and issues fixed? Never did strand me on the side of the road way. .IMHO . The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. Some guys have been able to use a tool through the top with the cover off to get it to release. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? If you just crack it without it starting it moves all the time . I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? I have been assuming this is just a slow to pump-up lifter or lifters. How do you know if the lifter has failed? Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. will feel like a jerk asking the clerk at lowes to cut them again. In other words, the crankshaft and bearings were not visible. misfire or anything. 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. 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. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? hi brian when you replace the lifters do you have to change the guides also? Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. AFMlifters have a history of failing and oil consumption can be a problem. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. Yeh truck has 5237 miles on it This is my project car and will be my drive (about 5000 miles a year). A 17 with 5.3. Traded it with 180K miles and did not experience any problems. Should I buy one to disable the V4 mode? I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. Verified over hundreds of trips, makes no sense. a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. You cannot compare them to old 350s. If so what would the vin code be? 190k on the motor always ran AMSOIL full synth since new. I was told that before I start the vehicle up I will need to have the AFM and VVT disabled in the ECU but that would require a custom tune from a tuner as the ECU cannot just be told that the AFM and the VVT is gone. how many miles do you have on your engine? Junk . 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. Engine starts but is throwing a misfire on cyls 4,7. The trucks are only supposed to use two four. This new lawsuit is essentially identical to the previous. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. A tuner can often fix that as well by giving it some more ignition advance in these regions. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. It has AMF. So I researched and got an AFM disabler. 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. Seems my oil pressure sensor is bad, are showing the same oil pressure at all times, even when it dosnt run.Dont know it that fault was there before i replaced the lifters. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. 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. Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? With 44, its a enormous Jon to remove the oil pan. Just shut AFM off. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. It is usually first noticed during highway driving. Now the problems back, I have 180k miles on it now. NOTE:If you were in a situation where youve installed the AFM delete kit, but dont have access to a programmera disabler can still be a viable option. I have the towing package on my 13 Tahoe LTZ. I am a long time GM fan but after reading how they messed up the 5.3 ( I had a fantastic 2003 Z72 off road) Ill look else ware for my next vehicle. 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. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). Thanks. Once the lifter has been damaged, the cam is probably also damaged. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. I have a 07 Yukon with 180K and no issues what so ever. The motor I pulled was a 2007 LY5 with about 77k on it. it is the regulator guy! Only running on drivers side cylinders. 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. 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". 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. . Bought an 07 GMC Yukon 5.3 with the AFM, 87k. [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. Any help would be appreciated. All the time. []. Plug the tuner into your GM vehicle's OBDII diagnostic port, and follow the instructions provided to update the engine control module's program The new program will make sure that AFM never engages. What type of disabler did you go with? 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. I am considering the same. This happened on a camping trip with my kids last friday night. 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. I asume low oil pressure cant make some of the DOD lifters to malfunction? Hi. If I had wanted a 4 banger I would have bought one. Can I (should I) also change to a standard volume oil pump? Just one. the body is in great shape. whith a disabler. Most will want to get rid of the AFM immediately and VVT isnt for []. I always have done my oil changes on time, not sure about the people who owned it before me though. Thanks for the detailed post! another common cause for low OP is the oil pick up tube O ring. Truck ran fine before that. I would just have the AFM disabled (tuned out) then. Now you tell me AFM works and I will tell you; that you are full of shit!