She had driven it for a couple of months that way. 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. 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. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. I have a 2013 1500 with the LC9. On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . Everything was fine for two weeks, ow customer complains s it same noise it made as before. But the problem at that time was the computer technology. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. Is this the shield you referred to in a past post? With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. Theyre also notorious for bad cam tower oil leaks. Now I know why there wa such a push to get older ,less efficient vehicles off the roads. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. Glad I did. I have a 2011 GMC Sierra 1500 with the 5.3. I just got new warranty engine and dont want this issue again? 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. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. 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! This lowers the cost of building it [], [] aluminum block engine. I had a 2007 Yukon XL 5.3 with the AFM. 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? Wed recommend a call to our partners at Summit Racing. There is no light on my dash or anything that indicates the system is active or exists, so its very confusing, Im still not sure if my vehicle has it or not. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. changed oil , its all working now, but want to disable this sorry system. There are no changes in the valves or the springs. Did not help. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes (Non-AFM engines have a smooth cover.). Why this happens is a more . The wife however found this deal on an Envoy Denali . document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. I love the car so far. how many miles do you have on your engine? The 2016+ Tacomas are junk. Learn how your comment data is processed. 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. (Bought car 1 day before lifter died!) I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. What type of ODBII gadget did you use? Corvette that does employ AFM. The older truck gets 19 mpg the newer truck with fuel management gets 14. Teflon coatings does not last. If the 4th cylinder lifter has failed, would driving it damage the engine? TheAFMcylinders are opposite of one another in the firing order. 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. I have no other engine problems and Id like to fix the issue. 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. If so what would the vin code be? 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. I recently bought a low mileage 2013 Silverado and the lifters collapsed. Fouls those plugs. It has plenty of oil pressure and I put all new lifters in it. GM switched over to the 4100 v-8 in 1982. Im confused from the write up about the plug in. Hi Grant is that disabler still working for you ? 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. Yeh truck has 5237 miles on it However, the fuel savings are not always as much as expected. Stopped at nearest gas station and found I was a quart low on oiladded oil and lights eventually went off and luckily we made it the 5 hour drive home. But it also restricts passages that the oil runs through. Basically rebuilt most of the engine while in the vehicle. I have successfully used a gadget that plugs into the ODBII. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). [], [] 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. This is my project car and will be my drive (about 5000 miles a year). My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. Plugs spark fine engine has power at higher RPMs although it is still in Limp mode / stabilitrack message, even after driving it a few times above 60 MPH then clearing errors with handheld programmer. My question is: do I install the electronic disabler on the new engine to avoid future issues? Yes, always change all the lifters at once. This reduces expense when you build it [], [] intake, and a cable-driven throttle body, plus Im also installing Trick Flows VVT and AFM delete kits. From what Ive read new and low mileage engines with no issues is ideal to do a afm delete, tune, or use of a disabler. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? i just bought a 2018 Silverado with the 5.3 There has been a lifter noise since I bought the truck 1 year ago. Do you think I can still disable AFM? Thanks for the advice Brian! Driver reported this occurred suddenly while driving down the highway. 2 15 with 5.3 Sierras both with 100k and 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). 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. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. This is in response to pretty much everyone. I will keep reading and take notes. 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. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. It is currently at the dealer having a new long block installed under warranty. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). 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. This is what I keep telling people. She started to have the lifter problem again after 60,000 miles more. 330-630-0240. .IMHO . I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. It does seem that when they start goingthey go quickly. do you fill to capacity anyways???? 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. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. 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? It seems this tough engine has everything incorporated into it. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. It depends on the failure mode of the lifter however, certainly worth a try. The trucks are only supposed to use two four. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. [] 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. The result is improved combustion chamber pressure as the piston approaches top . Who knew? In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Told her that it would not last and that she needed to find a different way to get around. 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. 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? 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. I told her to never pull the gadget out. It came back on last Wednesday starting with a flash. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. bought at Brian Tooley Racing ! Would installing the Disabler solve this? Not sure what else it can be. With 40000 Should I wait until the warranty runs out, or will that be too late to stop possible damage? It is being covered under warranty since I only have 72,000 miles on it. Remembered that after I bought my Tahoe. Truck ran fine before that. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. When they are locked into position, they wont wear further and cause issues down the road. 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. Run it and let it soak overnight. Hopefully more is known by then. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. Hello. Would never take it on a long trip. Have a lifter problem on my 2010 5.3 Silverado. The system uses solenoids to deliver oil pressure to control. Still have no power. 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. Hi. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). Pod. If I put my truck in manual 5, it doesnt try to go into V4 mode. I asume low oil pressure cant make some of the DOD lifters to malfunction? Sylinder one lost compression on my 09 5,3. 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. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. With 44, its a enormous Jon to remove the oil pan. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. You mentioned that it will shoot oil into the pan and on the cylinder walls possibly causing some oil consumption So i have a running vehicle and my only concern is making it as reliable as possible, should I disable the AFM or not?? 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. Next day, fired it up to take the the junk yard and it ran great. Is this an issue only with GM SUVs and trucks, or does it include cars too? We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. I have a 2012 Chevy Avalanche. Very expensive repair too! My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. Id wait until the warranty expires then disable. I drive the same 320 mile trip every two weeks and drive the same route and full tank. 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. [] 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 []. Cylinder deactivation works to save fuel, but it may not be for the reasons you think. These trucks cost too much to have a terrible product. It is also known as Displacement on Demand (DoD) or cylinder deactivation. Thats not all bad because it saves the cost of an AFM delete kit. So I researched and got an AFM disabler. If i am successful locating a non-dod vin would i just need to have the ecm reprogrammed? Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. This really sucks. hi brian when you replace the lifters do you have to change the guides also? All these comments on the 5.3 are blowing my mind!!!. If the lifter actually fails so that the mechanism wont release, it wont work. No movement on the rocker arms. Once the lifter has been damaged, the cam is probably also damaged. Did Obama make them do this? I would appreciate it if you let me know how you make out. Carbon Build-Up in the Intake Ports. Put everything back together proper torque, gakets, valve seals, etc. i have a 2007 suburban 6.0 and the number 4 intake lifter took a dive.i have already started to disassemble the engine as i plan on replacing all the lifters and reassemble the engine as i never had any other problems with it. They should let us the better mileage. I was looking at the 08 escalade hybrid with dod on its 6.0 so wondering if the delete would contribute to the high oil consumption and therefore would adding the deflector be a good idea. I have a 12 with 4.8 Silverado 75000 miles We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. The cost of just rings $4,000.00, [] Disable your Chevy AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] like front timing cover, knock sensor location, cylinder head style (cathedral ports), AFM (Active Fuel Management), and other components are key clues to which engine family youre looking []. This system is the most effective way to disable AFM. 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. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. I am worrking on a 2007 chev Silverado 6.0 engine, [] the L76 that was equipped with AFM and had a ribbed valley cover, the L98 cover was []. Can I (should I) also change to a standard volume oil pump? I can tell you for the past 2 years I changed out my LC9 5.3L fully synthetic oil every 3,000, even though Mobile Oil claims 10,000 miles or more. I am wondering the same thing. 2018 new truck has me really disgusted If I had checked this out better, there would have been one less POS Chevy sold last year ! Stop-start cylinder deactivation, direct injection, variable valve timing, thermal management, and continuously variable oil pump; are just some of the Silverado features of . I always have done my oil changes on time, not sure about the people who owned it before me though. The Jury is still out on the Gen. 5s but the warranty could be an issue. 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. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? 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? Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. But not sure very annoying. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. AFM Sucks!!! I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. Constant engine and transmission problems. The engine also had 799 or 243 casting heads which are closely related to the LS6. What was happening to the first is slowly (or quickly in your case) happening to the others. 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. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. 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. Unfortunately, I found out about the lifters too late. Your email address will not be published. What type of disabler did you go with? That inherently less smooth operation requires additional NVH dampening. I am having that done today on my 08 Suburban and its only costing me $225. Required fields are marked *. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Its not possible to install them wrong? I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? At this state, a disabler would probably do what you need it to do. I dont plan on installing the delete kit at this time. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. 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. Definitely dont want to do anything to fix one problem and create another. Took the heads off again. September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine.

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