After reading these forums Im a little concerned about my decision to stay with GM. I still get a P0336 code every once in a while but still good to drive around town. My daughters car had about 230,000 miles when she complained of the problem. It works . I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. whith a disabler. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? 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. The lifter seems to recharge whenever the truck sits for some time. I guess I might have to call a dealership or GM to get a definite answer on this one. I had a 2007 Yukon XL 5.3 with the AFM. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. Its Chrysler and Ford.
How to Fix GM's Cylinder Deactivation Problems An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. It also has an electrical connector on the back. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. is it still working good since you have done that with the trans fluid? On one hand it has an aluminum block, which is nice. they are known to become plugged. Change your oil. . . []. How about if they just let us have a manual transmission agains for fuel mileage?
Chevrolet Silverado 2014-Present: Common Problems Glad I did. Absolutely agree, but we all know GM cant afford to recall them all & definitely wont, gettin a Toyota, but first will go to GM dealer and ask to see a truck without AFM & when they say they dont have it Ill say See ya, I have an appointment with the Toyota dealer! Always had GMs never anything else till now. Thankfull for any ideeas! . Thank you for your time. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. She drove it for another 35,000 and it went out again. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. What type of disabler did you go with? Can you tell me what needs to be done with the VVT?
PDF GM LS AFM Deactivation Lifter Issues - Melling So for all of you that continue to complain about how bad these things are. Seafoam with syn oil change only fixed for a week. If you ignore it and keep driving, odds are you will destroy the cam as well. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. I have a 2011 GMC with over 162,000 miles on it and it runs great! Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve .
GM Active Fuel Management Cylinder Deactivation Technology - GM Authority 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. Send response to tkrieg@cox.net. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. Still have no power.
What Is Hemi MDS? - MotorTrend Ayush Srivastava Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. 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. When they are locked into position, they wont wear further and cause issues down the road. I always have done my oil changes on time, not sure about the people who owned it before me though. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. []. Took the heads off again. After all we bailed them out of bankruptcy. It has AMF. Is this the shield you referred to in a past post? This update also saw the usage of cylinder deactivation technology or Active Fuel Management. Last GM Ill ever buy unless its got a diesel. 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.
2014 Chevy, GMC Pickups Recalled For Cylinder-Deactivation Issue On the AFM lifters that dosnt work i have installed them With the oil hole Down! Are you saying that I am in the clear by a year and issues fixed? IMHO . Really could use some pointers. They should let us the better mileage. 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. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. 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? 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! Or not because it is the cast iron block and not he aluminum block? You could also have tried that if the trans oil didnt work. I am trying to prevent same issue. Any problems to watch out for?Did you replace the VLOM? Been driving with no issues but I did notice that the AFM disabler removed a P0449 code (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction) dont know if this is a coincidence or they are related??? Just pulled it down in the garage there was no other damage , luckily. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. I have a 2014 Silverado with a 5-3. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. My 5.3 has a vin code of O. What was happening to the first is slowly (or quickly in your case) happening to the others. Are there errors or something only the dealer can clear? . 50,000 miles. Replaced all lifters. Unfortunately, I found out about the lifters too late. Yes a poor design but a flaw ? Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! Would installing the Disabler solve this? I have a Yukon 116k it now needs its 3rd set of lifters and cam. This is in response to pretty much everyone. Definitely dont want to do anything to fix one problem and create another. A custom tune by a knowledgeable tuner with access to a chassis dyno will pay a lot of other dividends other on top of turning off afm and VVT. Dont want to make a move on a new truck or jump to a 2500 yet. Then had to drive the truck back to Tampa from Cheifland Fl. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. It is usually first noticed during highway driving. 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. Is this an issue only with GM SUVs and trucks, or does it include cars too? We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. HP tuners is not for someone like me that doesnt know how to use it and from what I read neither the range nor diablo plug and play device will work since the buicks pcm files are different than all other GM vehicles that came with afm because it was tuned in house at gms performance division. Have misfire code and engine has what I would call a surge while driving. If possible, will simply not using VVT provide a powerful,good running engine? You also need the disabler installed in your obd connector. GM's Active Fuel Management (AFM) works under certain light load driving conditions to maximize fuel economy by deactivating 4 of the engines 8 cylinders.
The write up confuses me. Better airflow reduces drag on the pistons and the associated pumping losses. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order.
Why does GM's cylinder deactivation cause lifter failure? 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. We chickened out though and just bolted the AFM solenoid plate onto the used engine. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. Carbon Build-Up in the Intake Ports. I would appreciate it if you let me know how you make out. I am having that done today on my 08 Suburban and its only costing me $225. Ditto , never buy a throw away vehicle again is my recommendation and my fix . Cost about $250, but it is not fool proof. They may be able to find some of those missing ponies. Dave, I also have a 2008 LTZ avalanche with 106,000 I have the exact same symptoms at this point I just want to sell it will the disabler help remove the check engine light wont pass inspection with light on thanks for your help Chris.
Is Your 5.3L V8 Engine Eating Up Too Much Oil? We - GM Parts Online module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. Brian, I have been reading your article about the AFM. I would. On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . They are taller and have special oil holes. I love the car so far. Would doing the disabler option once I get it back be the right one? Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you.
Cylinder deactivation | GM Truck Club Forum 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 . Not sure what else it can be. One must anticipate this. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). The older truck gets 19 mpg the newer truck with fuel management gets 14. (Non-AFM engines have a smooth cover.). Will the plug in deactivater fix the oil consumption or will it cause more consumption? I havent has any lifter or cam issues. When you eliminate the AFM system, the extra oil is no longer needed. Truck ran fine before that. Why cant u just unplug the solenoid on back of engine by oil pressure sensor?
GM Releases Valve Lifter Service Update For V8 Engines I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. Most of all, my concern is reliability. The engine is running on only four cylinders. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Hi. AFMengines use special lifters for cylinders 1, 4, 6, and 7. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? Ive read at many websites that the GMCs envoys, Chevys and saabs did start to come with AFM in 2005 with the LH6 motor,It says here it started in 2006 on the saabs, then the pick-ups got AFM in 2007. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Clean oil is crucial. 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. But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. It has the orings in place, that seals the towers. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . The trucks are only supposed to use two four. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. 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.
Chevy Silverado V8 To V4 Problems - Tools Bible 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. What the biggest reported problem with Chevy Silverados? 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. 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. He used seafoam and changed to synthetic oil. In other words, the crankshaft and bearings were not visible. I couldnt agree with you less, yet I respect your opinions. I would say maybe 5% of my customers keep up on their oil changes. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. If you just crack it without it starting it moves all the time . Take a look at what bmw did in its R1250 bike.
Problems regarding Chevy 5.3L engines ticking noise and misfire. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . GM uses 3 different styles all are engine specific. Wed recommend a call to our partners at Summit Racing. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. Thanks. 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. 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. Pod. I know a few guys with Tundras. has 92,000 miles and was just told I have cam and lifter failure. Had similar problems under warranty, no telling what they rigged me up with at the dealer. I wont bother with blocking the relief valve. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. Fortunately, the old engine hadnt been shipped back to the remanufacturer. It is being covered under warranty since I only have 72,000 miles on it. Thats not all bad because it saves the cost of an AFM delete kit. This system is the most effective way to disable AFM. I just bought a 2018 Silverado. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. Do you think I can still disable AFM? Pulled the inntake and replaced valleypan With all the solenoids. The only solution is to replace the entire cylinder head. Hopefully he can free up the stuck/collapsed lifter.
If you think GM pioneered cylinder deactivation, guess again I got the AMF disabler anyway and so far so good. I just got new warranty engine and dont want this issue again? Looking to tear down myself. Thank you. it is the regulator guy! There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. Ive been reading, with disgust and concern of the lifter/cam situation.
Active Fuel Management About Gone From 2022 Silverado Lineup - GM Authority Any thoughts or suggestions would be appreciated. The oil pump is high volume, but there are a lot of people that dont change it and rely on the pressure valve to keep the volume manageable. 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. Found that all passenger side cylinders are not firing. Ive been a Ford guy my whole life, so I was unaware of AFM until a recent trip where I did a lot of highway driving and happened to bring up the real-time mpg display, where I saw it switch between V6 and V4. 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. I contacted service manager in Gastonia, NC and he was kind enough to tell me the whole history of the problem.. EPA required better fuel mileage and less emissions and GM, Ford and Honda(V-6) came up with this failed AFM system. what deleter (if thats a real word) have you heard good things about. , Production date on the vehicle is 04/2006 oddly enough. 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? Love the truck so far. I have a 2007 Yukon XL with the 5.3L and am planning to do this as my lifters have failed and it rattles loudly if it starts, and runs limp. Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? The 2nd went with a conventional valvetrain. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. changed oil , its all working now, but want to disable this sorry system.
Chevy 5.3 Engine Problems Are They That Long-Lasting? - Motor Verso I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. They layed over night in engine oil before instalation. Pushing forward. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. I would appreciate any feedback.
Another General Motors 5.3L V8 Lawsuit Filed | GM Authority My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. If buying a tuner/chip which works best for that truck/engine? Constant engine and transmission problems. While it does still use the GM Active Fuel Management cylinder deactivation technology that caused a plethora of issues on the gen-four Vortec 5300 engines, it seems that GM has solved the issues related to excessive oil consumption. Disable the afm. 1981 Cadillac V 864. 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. 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. I have an 07 Yukon with over 180K. 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. Because I want to. 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. in your opinion will this work, i really dont see any reason it wouldnt.
The Hit and Miss Nature of Cylinder Deactivation Systems Replace the cam or do the delete kit? So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. This is my second Avalanche and I never had any issues with either of them. 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. All ready done valve job . He stated if I continued to exceed 4500 RPM it would blow the lifters out. Replacing engine due to issues caused by AFM. Im confused from the write up about the plug in. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. Dont drive it if you have a dead cylinder due to afm failure. [], [] way. Nine plaintiffs filed the General . It could be the filter screen under the oil sending unit. Only wish Id did my homework, nothing but issues, from 14,000 miles it starts this motor noise,as if lifters at cold starts, let set up for 8 hrs same noise, this noise is on the right side of engine, it lasts 5 seconds but never heard this until we had this cold spell in the state low temperatures or it was just time for this to start? Help appreciated. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. i just bought a 2018 Silverado with the 5.3 hi brian when you replace the lifters do you have to change the guides also? It seems to me that the high volume oil pump should not hopefully cause premature wear but if it is pushing more oil through the heads than I guess the valve stem seals have more work to do. If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. The exhaust valve remains open during the intake stroke and closes just before BDC. I just did the delete and replaced the cam as well. I have 217,000+ on it and it never fails meever! Im servicing a 2011 Chevrolet 5.3 with AFM. All the time. Now the problems back, I have 180k miles on it now. The engine has flex-fuel capability. Most will want to get rid of the AFM immediately. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. You may want to update your post. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. Batten, followed by several years developing performance pistons at Wiseco Piston Co. Today, Brian develops performance parts for Summit Racing Equipment and is a regular OnAllCylinders contributor. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. If I put the Range module on, is that all I need to do, both now and long term?
Go Small? Common Problems With the Chevy Silverado 2.7L Turbo I have also heard that the oil pump is to be changed and I have also heard that it does not matter. I drive the same 320 mile trip every two weeks and drive the same route and full tank. The engine will switch to operating on fewer cylinders when cruising at a constant speed. I have already dropped a lot of money on this truck (08 suburban). 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. If the 4th cylinder lifter has failed, would driving it damage the engine? I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine.
The 1 Big Problem People Are Having With the Chevy Silverado - MotorBiscuit Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines.