My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. GM get a clue! Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. Can they be faulty? Another option is to plug it entirely if the AFM is already removed. I also notice that it doesnt go into V4 when it is cold. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. $8500.00 fix. 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. 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. All the time. 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. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. Replacing engine due to issues caused by AFM. This is what I keep telling people. Chevy 5.3 Engine Problems Are They That Long-Lasting? - Motor Verso They are taller and have special oil holes. He used seafoam and changed to synthetic oil. It also has an electrical connector on the back. Now Im here tring to figure out what to do. 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. After taking a $3.6h bath on the lifter/valve work and doing a little research, how can GM allow a problem like this AFM continue from 07 to present? Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 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. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. This basically deactivates the cylinder deactivation system. Replaced all 16 lifters due to collapsed lifter on CYl #4. 50,000 miles. Id wait until the warranty expires then disable. With 40000 The write up confuses me. But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. 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. Thank you. 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. Last GM Ill ever buy unless its got a diesel. Covers me to 100K. At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. The oil is baked on to every component. If you think GM pioneered cylinder deactivation, guess again Can I (should I) also change to a standard volume oil pump? There are 5.3 cylinder deactivation problems that can occur. I did noticed the oil consumption but it was rare that I would have to add oil. If you are using VVT, you could use the NAL-12612273 (L92) cam. I have no other engine problems and Id like to fix the issue. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). After all we bailed them out of bankruptcy. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Now I get 24 to 26 with deactivation locked out and full power. I cant really tell from driving. Have a lifter problem on my 2010 5.3 Silverado. If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. Was a disaster then but a profitable disaster. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. All these comments on the 5.3 are blowing my mind!!!. Install an AFM Delete Kit Is this an issue only with GM SUVs and trucks, or does it include cars too? I quites down to nothing after running for about a minute. If I put my truck in manual 5, it doesnt try to go into V4 mode. The most common issue GM vehicle owners with AFM report is increased fuel consumption. Then again, it should have never been controlling those solenoids. Told her that it would not last and that she needed to find a different way to get around. Thankfull for any ideeas! PDF Service Bulletin Bulletin No.: 20-NA-038 Date: March, 2020 .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. I just did the delete and replaced the cam as well. September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. Why does GM's cylinder deactivation cause lifter failure? It seems this tough engine has everything incorporated into it. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. misfire or anything. The Hit and Miss Nature of Cylinder Deactivation Systems One the other hand, it came without AFM, VVT, or flex fuel capability. AFMlifters have a history of failing and oil consumption can be a problem. I am leaning heavily on installing the AFM disabler. I have a Yukon 116k it now needs its 3rd set of lifters and cam. 1981 Cadillac V 864. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. Hi Brian, 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? I love the car so far. Removing ignition lock cylinder when it won't turn at all You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. 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. The biggest difference between the Vortec engines that used to be found in Chevy and GMC vehicles and the EcoTec engines found in them now are the fueling methods. Most of all, my concern is reliability. Because I want to. Should I buy one to disable the V4 mode? Cant believe they havent fixed this in a decade. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. Any help would be appreciated. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. My question is: do I install the electronic disabler on the new engine to avoid future issues? Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. This system was originally used in early 1980s Cadillacs. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. But after reading this thread, Im a little concerned about the long-term reliability. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). Do not pay that amount. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . But the problem at that time was the computer technology. Brian, thank you for the quick response. All eight cylinders are now powering the engine. Had similar problems under warranty, no telling what they rigged me up with at the dealer. Your email address will not be published. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. They dont so any better than domestics on mpgs. GM offers the following diagnostic steps in determining if this is the problem. Brian, I have been reading your article about the AFM. Since no air can get in or out, four cylinders provide no power. 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. I have a 2011 GMC Sierra 1500 with the 5.3. GM Dynamic Fuel Management Cylinder Deactivation Technology - GM Authority 330-630-0240. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. I call it active obama fuel management .A scam . So I did the job one more time. It is a bad deal for sure.ive fixed a few best thing u can do is delete it in buy kit.no sense in fixing a flawed problem with the same flawed parts. 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. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM Any truth to that? module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. AFM - active fuel management strategy which deactivates the lifters on specific . Does anyone know how to disable the new Dynamic Fuel Management on the 2019 Silverados? Would it be fine to go ahead with the AFM Disabler? Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. It is usually first noticed during highway driving. I guess I might have to call a dealership or GM to get a definite answer on this one. If the 4th cylinder lifter has failed, would driving it damage the engine? 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. 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. This lowers the cost of building it [], [] aluminum block engine. Pulled right valve cover an rockers on syl 6 dont move. With the nipple, or without? 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. Drives way better for my mostly paved road driving. Fortunately I received a reducing in house shop hourly rate. AFM Sucks!!! The biggest problem is nobody changes their oil on time. 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.
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