AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. Since no air can get in or out, four cylinders provide no power. I recently bought a 2018 Silverado 5.3L with AFM. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. I havent has any lifter or cam issues. AFM Sucks!!! It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. No it runs fine on sylinder one but not on 6 or 7!!! There are so many more oil passages on engines these days. I have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. The detergent. It depends on the failure mode of the lifter however, certainly worth a try. They took the engine down today found so much damage inside they ordered a new engine from Detroit. 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? Im confused from the write up about the plug in. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? Any advice that you could offer would be great. The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. It is being covered under warranty since I only have 72,000 miles on it. I have only put about 600 miles on it and noticed that the oil was a bit low and am hoping that it was that way when I picked it up. Another option is to plug it entirely if the AFM is already removed. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? I have an 07 Yukon with 230k on the engine. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. It was good for about 10 miles and started with same loud knock noise. 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 . The result is improved combustion chamber pressure as the piston approaches top . Do you think I can still disable AFM? Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. 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. 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. 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 had one fail and it chattered the cam to the point that I had to Install a new cam. 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? I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. []. Cylinder Deactivation to the Rescue. That might show up if you cut the filter and looked for debris in the pleats. It has has 9000 miles and no lifter or other issues or codes so far. Replaced all 16 lifters due to collapsed lifter on CYl #4. The problem I am facing is that I want to drive this vehicle for at lease another 77K and do not want to drive my vehicle with this AFM issue. I am hoping this does the trick.
2019 Chevy, GMC Trucks Get Smarter Cylinder Deactivation - Car and Driver [], [] 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. Ive only put a straight pipe exhaust, intake, and a boost controller on it. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. Just one or two. All the time. One the other hand, it came without AFM, VVT, or flex fuel capability. Fouls those plugs. Then it takes out the lifter again and again until you bite the bullet and replace the cam. 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??? Did not help. It replaces the AFM components with standard parts. My 5.3 is. 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. The most common issue GM vehicle owners with AFM report is increased fuel consumption. 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". 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 exhaust valve remains open during the intake stroke and closes just before BDC. I still get a P0336 code every once in a while but still good to drive around town. Thanks. I service plenty of these vehicles with AFM, and the ones I have to open up the engine for repair because of a failure doesnt surprise me anymore. 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. 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. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. The engine will switch to operating on fewer cylinders when cruising at a constant speed. No problems with any to this point. I am trying to find out of this is true. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. 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? My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. Not sure what else it can be. Its Chrysler and Ford. There is a chance the cam lobe was stressed and started to deteriorate.
Chevy 5.3 Engine Problems Are They That Long-Lasting? - Motor Verso I went with the new motor for the warranty. Everything was fine for two weeks, ow customer complains s it same noise it made as before. Installed them again, all facing upwards, will know tomorrow if that was the solution.If this is the cause i cant beleve why they arnt build so that it is impossible to install them the wrong way in the plastic holder.And altso that there was no warning or installation advice With the New lifters.If these are the only lifters in the Whole world that must be in
Another General Motors 5.3L V8 Lawsuit Filed | GM Authority Replace the cam or do the delete kit? Didnt change exhaust nor tune so likely no change in power/torque. A 14 gmc 5.3 Sierra 85000 miles I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? Shame this happened. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. Unfortunately, I found out about the lifters too late. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. The lifter seems to recharge whenever the truck sits for some time. They may be able to find some of those missing ponies. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. She had driven it for a couple of months that way. Number 7 cylinder lifters stops moving when truck starts. Clean oil is crucial. Question i just bought a 2005 Saab 9-7 with 5.3 v8, (same as GMC envoy) which came with AFM, the car runs fine, so if i just install the OBDII electronic device, is it just as likely that my lifters will still go bad? Who knew? Does the Pressure relief vavle ever go bad?? 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! 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. Pushing forward. Im curious as to how much tran fluid you put in? Id wait until the warranty expires then disable. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. 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. Replaced all lifters. For fun, he runs his 427-powered C5 Z06 in ECTA land-speed racing, at OPTIMA street car events, and at a mix of autocross, drag racing, and track days. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. If you left the original cam in, the AFM cylinders will be down about 25 lbs. 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. On June 4th you stated 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) I am looking at purchasing a 2012 Tahoe with the LMG per the build sheet. Hi Brian, If you installed a performance cam intended for a car, it may be bleeding off some low end compression. I drive the same 320 mile trip every two weeks and drive the same route and full tank. Their tech guys have seen it all and may have some thoughts on this as well. I would appreciate it if you let me know how you make out. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. All New lifters were from AC delco. [], I have a 2012 Silverado Z71 bought new. stalled in a certain way a warning wouldn be a bad idea. 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. They are taller and have special oil holes. However, the fuel savings are not always as much as expected. It seems this tough engine has everything incorporated into it. One must anticipate this. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). Would installing the Disabler solve this? Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. . If so what would the vin code be? Did Obama make them do this? 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? [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. 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. 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. Todays computers are faster so it does work. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. 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. You could also have tried that if the trans oil didnt work. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. The motor I pulled was a 2007 LY5 with about 77k on it. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. the extra oil isnt needed. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. [], [] LS Tech: How to Delete VVT or DisableAFM []. I want to put a AFM disabler in it what all do I need to have done. 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. Would it be fine to go ahead with the AFM Disabler? This system was originally used in early 1980s Cadillacs. Truck has an active P0300 code and runs very rough. I noticed this discussion mainly addresses Chevy Silverados and other trucks? I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. The engine had 200K miles. 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. I have no other engine problems and Id like to fix the issue. With 40000 Most of all, my concern is reliability. I did noticed the oil consumption but it was rare that I would have to add oil. Sylinder one lost compression on my 09 5,3. 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. GM uses 3 different styles all are engine specific. Ill Never Ever buy another gm. I will be installing the AFM deactivator tonight when I get hoe. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. This happened on a camping trip with my kids last friday night. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. Any guidance would surely be appreciated. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. It has the orings in place, that seals the towers. No other truck my ass .lol my 99 silverado 1500 with the junk LR4 4.8l and 320k miles 9n itgets 21mpg all day long with 93 octane gas in it. NOT GOOD!! I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. I cant really tell from driving. 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. [] 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.
If you think GM pioneered cylinder deactivation, guess again 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. I recently took a long trip and it burned 1.5 quarts of oil. 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. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. 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. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Had similar problems under warranty, no telling what they rigged me up with at the dealer. Its a CA EMMISIONS TRUCK. .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. Ketil, let us know what you find out. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. Hello. When you eliminate the AFM system, the extra oil is no longer needed. Brian, Pulled the inntake and replaced valleypan With all the solenoids. You also need the disabler installed in your obd connector. What type of disabler did you go with? Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . Install the disabler when you get your Yukon back and it will remain in good working order. 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. 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? Have a lifter problem on my 2010 5.3 Silverado. I would say maybe 5% of my customers keep up on their oil changes. As we were installing the sensors prior to installation in the vehicle, we noticed that there was no fitting on the oil pan for the oil level sensor. [] 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. Hi Mike, the metal shield you noticed is probably the windage tray. will feel like a jerk asking the clerk at lowes to cut them again. But it also restricts passages that the oil runs through. Does the disabler prevent the engine damage in the first place? The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. Install an AFM Delete Kit Since the tranny oil worked, you should now change the oil, right? 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. On the AFM lifters that dosnt work i have installed them With the oil hole Down!