gm cylinder deactivation problems
Cylinder Deactivation to the Rescue. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. Ketil, let us know what you find out. Do you think I can still disable AFM? I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Why would GM ever produce such problems with such little to gain. With 44, its a enormous Jon to remove the oil pan. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. Its Chrysler and Ford. I noticed this discussion mainly addresses Chevy Silverados and other trucks? Nine plaintiffs filed the General . Is this the shield you referred to in a past post? You cannot compare them to old 350s. Thats not all bad because it saves the cost of an AFM delete kit. I own a reputable repair shop. A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. Question is, since my 2004 ECM and wiring harness were made before the AMF came about will this motor work properly as a V8 or will I need to replace the lifters, cam, oil sensor, etc as the delete method mentions? Pulled right valve cover an rockers on syl 6 dont move. will feel like a jerk asking the clerk at lowes to cut them again. Thanks. 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. No problems with any to this point. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. it is the regulator guy! Basically rebuilt most of the engine while in the vehicle. Our 2013 yukon with 47k miles just failed. Loved the looks and interior and thought a I got a great deal at $6k even. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. . You will get codes thrown if the afm is physically removed without telling the ECM you did so. This lowers the cost of building it [], [] aluminum block engine. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. I couldnt agree with you less, yet I respect your opinions. 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. That might show up if you cut the filter and looked for debris in the pleats. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. 50,000 miles. is it still working good since you have done that with the trans fluid? My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. 1. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. 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. Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. The most common issue GM vehicle owners with AFM report is increased fuel consumption. I just bought a 2018 Silverado. I still get a P0336 code every once in a while but still good to drive around town. Perhaps a flaw by design would be a more appropriate description . 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. It is being covered under warranty since I only have 72,000 miles on it. I can literally drive from Seattle to Redding CA on one tank. I have read synthetic isnt good for AFM lifters. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. Required fields are marked *. Welcome to socialism folks . [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. 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. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. [] engines is that when VVT (variable valve timing) appeared and was later followed by AFM (which is Active Fuel Management, when the engine deletes four cylinders under light load) both of these packages drastically affect []. I would say maybe 5% of my customers keep up on their oil changes. While the system sounded good, the microprocessors scrambled to activate, deactivate, and then reactivate cylinders as driving conditions quickly changed, causing the car to hesitate, buck, and stall. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. This happened on a camping trip with my kids last friday night. A tuner can often fix that as well by giving it some more ignition advance in these regions. I have no other engine problems and Id like to fix the issue. Hopefully he can free up the stuck/collapsed lifter. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. [] for performance, LS9 engines didnt use Active Fuel Management (AFM), Variable Valve Timing (VVT), or Flex Fuel (E-85) technology. The oil collapses the plunger inside the lifter. so the trans fluid worked for you then? Put an S&B cold air intake on last week with huge oiled filter and it made a big improvement in throttle response and it appears possibly a slight improvement in mileage. That inherently less smooth operation requires additional NVH dampening. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. But then she passed away from cancer. Toyota will be my next truck unless GM owns up and makes wright with consumers. What type of disabler did you go with? This update also saw the usage of cylinder deactivation technology or Active Fuel Management. The oil is baked on to every component. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? This is my project car and will be my drive (about 5000 miles a year). My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. Yes a poor design but a flaw ? He stated if I continued to exceed 4500 RPM it would blow the lifters out. It has AMF. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Regarding the cylinder deactivation impact on fuel consumption . I have a Yukon 116k it now needs its 3rd set of lifters and cam. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] Since it is not costing me anything out of pocket, I did not go with the Delete Kit (did not want to spend the money). The only problem is the extra spray on the cylinder models if a deflector isnt used and this can show up as increased oil consumption. December 20, 2021 A GM lifter recall should allegedly be ordered for Buick, Cadillac, Chevrolet and GMC vehicles equipped with 5.3L, 6.0L or 6.2L V8 engines. One the other hand, it came without AFM, VVT, or flex fuel capability. 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. I recently bought a 2018 Silverado 5.3L with AFM. I am leaning heavily on installing the AFM disabler. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. I have a 2011 Chevy Tahoe with the 5.3 Gen 4 LS (VIN Code 0) and I bought a CAM motion DOD/AFM delete kit, 3 bolt drop in CAM Motion stage 2 camshaft, VVT delete kit and finally a Diablo Predator 2 Premium for GM programmer. The motor I pulled was a 2007 LY5 with about 77k on it. 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. Im praying that my RangeTech buys me a few years. Are you saying that I am in the clear by a year and issues fixed? Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. Anyway that horrible experiment was in the late 70s early 80s along with those converted Diesel engines..those like the 8-6-4 nonsense were just terrible failures. TheAFMsystem can be identified by its components. (Non-AFM engines have a smooth cover.). Run it and let it soak overnight. 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? The computers had not evolved enough to control the sytem. Still have no power. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . Cost about $250, but it is not fool proof. This system is the most effective way to disable AFM. Hello. It has plenty of oil pressure and I put all new lifters in it. Number 7 cylinder lifters stops moving when truck starts. Theyre also notorious for bad cam tower oil leaks. 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. When you don't need the full power of the engine, it provides better fuel economy." But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. []. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. I have a 12 wit 4.8 Silverado 75000 miles This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. Don't even get me started on the shortened life of the cooling, starting and charging systems. All Cylinders. 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). I have always loved Ford and Chevys , I dont like this Vehicle not one bit, starring shaft has to be lubed or it whines, front A arms has done been replaced, tapping in motor, leaf springs has been lubed, retorqued, put completely new leaf springs back in on the rear , grease all down from rims to body of truck, you have to clean often,console shakes as if milk shakes in console which later they also put rubber bushings in front of coils of shocks ( front end) .You lock it down in 44 it s metal to metal , As of now Im at 32,000 done gone threw all the arbitrator laws depending on how it goes? Then I guess I have to spend a bunch of money and get the delete kit. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. Fortunately I received a reducing in house shop hourly rate. I call it active obama fuel management .A scam . Im confused from the write up about the plug in. 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? Not sure what else it can be. If you swapped in a LS9 cam, you will find it makes good power at the very top, but its actually down from 5,000 rpm and lower where the truck spends the majority of its time. I had one fail and it chattered the cam to the point that I had to Install a new cam. 2 15 with 5.3 Sierras both with 100k and If AFM has been deleted, its common just to use a Dorman drain plug (m14 x 1.5) to remove the pressure relief valve entirely. All these comments on the 5.3 are blowing my mind!!!. It replaces the AFM components with standard parts. 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). The problem:. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. There are so many more oil passages on engines these days. Just recently, GM announced a temporary closure. He used seafoam and changed to synthetic oil. I would appreciate it if you let me know how you make out. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. Your email address will not be published. I ran 0W-20 on more the 5000 miles between changes. . I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles.
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