Salty Taste In Mouth After Tooth Extraction, Articles G

A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. Still have no power. What the biggest reported problem with Chevy Silverados? I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. You may want to update your post. Who knew? All Gen IV engine blocks haveAFMtowers and oil passages cast in. 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. 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 ! Battery was unplugged for a week.. [] 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 oil is baked on to every component. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. Id wait until the warranty expires then disable. Thank you for your time. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. 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. Our 2013 yukon with 47k miles just failed. Also putting in a new transmission vs. rebuilding. Can I (should I) also change to a standard volume oil pump? Im crossing my fingers it does the trick! Thanks for the advice Brian! The 2nd went with a conventional valvetrain. They are taller and have special oil holes. Can they be faulty? The write up confuses me. 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. [], [] as the LS engine familys hybrid engine in trucks and SUVs. These trucks cost too much to have a terrible product. Seems like the AFM disabler device is working for a number of people including myself as the 5.3l AFM engine has inherent design faults. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. [], I have a 2012 Silverado Z71 bought new. I already ordered the parts to replace myself and remove the code. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. Are there errors or something only the dealer can clear? It essentially turns your V8 engine into a V4 which saves fuel. GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. 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 . Driver reported this occurred suddenly while driving down the highway. I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. Some guys have been able to use a tool through the top with the cover off to get it to release. I have an 07 Yukon with over 180K. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. do you fill to capacity anyways???? the body is in great shape. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? I also have 08 Burb, but have different symptoms (high oil consumption, blue exhaust smoke at start, and now a really rough start after sitting overnight). The collapsed lifters will not engage the pushrods and both valves remain closed. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. Unfortunately, I found out about the lifters too late. The Tundra fares better but the frame has the rigidity of wet spaghetti and the 5.7 has had problems with VVT solenoids and the plastic timing chain tensioners. 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? You cannot compare them to old 350s. Just shut AFM off. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). When they are locked into position, they wont wear further and cause issues down the road. Number 7 cylinder lifters stops moving when truck starts. At this state, a disabler would probably do what you need it to do. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. I also notice that it doesnt go into V4 when it is cold. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM I only had 81k on the motor. One the other hand, it came without AFM, VVT, or flex fuel capability. I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. Does the Pressure relief vavle ever go bad?? Everything was fine for two weeks, ow customer complains s it same noise it made as before. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. 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. Easier said than done. If you just crack it without it starting it moves all the time . Once I get it back, could I install the Disabler safely. Since the tranny oil worked, you should now change the oil, right? 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. Any thoughts or suggestions would be appreciated. Wed recommend a call to our partners at Summit Racing. However, the fuel savings are not always as much as expected. The valve itself is part number W0133-2574213. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. Thanks. Get this, rebuild is only rings and maybe lifters. How long did it take? Wow, thanks for the wisdom,, i checked my VIN Code (position #8, M=LH6) and my 2005 Saab 9-7x does have the LH6 motor with iron block, Are you sure its only 2007 & newer motors? 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. Really could use some pointers. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. After reading these forums Im a little concerned about my decision to stay with GM. Just pulled it down in the garage there was no other damage , luckily. Fortunately, the old engine hadnt been shipped back to the remanufacturer. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. I had a 2007 Yukon XL 5.3 with the AFM. 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. 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. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. Glad I did. Did Obama make them do this? [], [] Its a Gen. 4 5.3L iron-block engine, so youre getting the better intake manifold, connecting rods, and ECM. It is being covered under warranty since I only have 72,000 miles on it. NOT GOOD!! I drive the same 320 mile trip every two weeks and drive the same route and full tank. 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. Never did strand me on the side of the road way. Its not possible to install them wrong? Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. 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. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. I speak from some experience. 50,000 miles. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. She started to have the lifter problem again after 60,000 miles more. 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. 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. CAM motion says no just have to disable the AFM and VVT with a stock tune as the camshaft is not an aggressive camshaft but a drop in. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. No it runs fine on sylinder one but not on 6 or 7!!! General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. You are correct. Yeh truck has 5237 miles on it We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. 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. Pod. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! The only solution is to replace the entire cylinder head. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. He used seafoam and changed to synthetic oil. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? Had nothing but trouble out of it. All eight cylinders are now powering the engine. []. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. Sylinder one lost compression on my 09 5,3. Theyre also notorious for bad cam tower oil leaks. Having it fixed now, just curious Seems like a problematic design. Its got a hundred forty-five thousand miles on it. I recently took a long trip and it burned 1.5 quarts of oil. Send response to tkrieg@cox.net. However I do have 7 year bumper to bumper warranty that covers this problem if I start to get lifter problems over the next 2 years.. On the other hand if get the AFM disabler installed I am pretty sure that I void the warranty from what I read on the policy. Im curious as to how much tran fluid you put in? Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. 2011 Chevy Avalanche LTZ. There has been a lifter noise since I bought the truck 1 year ago. More information can be found in the GM TSB bulletin number 10-06-01-008g. Their tech guys have seen it all and may have some thoughts on this as well. On the AFM lifters that dosnt work i have installed them With the oil hole Down! When a deactivated cylinder is reactivated, the control system opens the exhaust valve first to evacuate the trapped exhaust gas, before reactivating the intake valve to allow reactivated cylinders to revert to the normal operation of the compression/combustion exhaust/intake cycle. Then again, it should have never been controlling those solenoids. how many miles do you have on your engine? Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. The computers had not evolved enough to control the sytem. another common cause for low OP is the oil pick up tube O ring. AFM sucks Im paying for a truck that has broke down twice replace the cam and lifters and now its broke down again 105000 miles never heard of that in a 350 Chevrolet. Learn how your comment data is processed. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. Thank you. AFM - active fuel management strategy which deactivates the lifters on specific . The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. Seems my oil pressure sensor is bad, are showing the same oil pressure at all times, even when it dosnt run.Dont know it that fault was there before i replaced the lifters. Dont drive it if you have a dead cylinder due to afm failure. 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??? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Pulled right valve cover an rockers on syl 6 dont move. Looking forward to input from the forum, Thank you. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. The engine was not Flex Fuel (E85) capable and did not use Variable Valve Timing (VVT) [], [] TheL76like its LS2 siblingis a 6.0L, Gen. 4, aluminum small block engine that was used both in GM cars and trucks. I don know what else would cause the surge, but Id research the misfire code and see which cylinder is problematic. I couldnt agree with you less, yet I respect your opinions. 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. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. The detergent. GM uses 3 different styles all are engine specific. I ran 0W-20 no more the 5000 miles between changes. Help appreciated. what deleter (if thats a real word) have you heard good things about. 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. I will keep reading and take notes. 190k on the motor always ran AMSOIL full synth since new. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. I have had some say that it is the valves and others say that it is the cats plugged. The GM 2.7-liter L3B Turbo four-cylinder engine for Chevy Silverado and GMC Sierra pickups is meant to change minds about power and torque in a small package. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. When I first bought my newer truck with fuel management, the GM tech at the dealership told me; if I wanted the engine to live a long life keep the RPMs below 4500. . It actavated the lifter? Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. Would you get enough power to drive at freeway speeds? I loved this rtuck until this happened!! This really sucks. Open to suggestions about best course of action. Is this the shield you referred to in a past post? Below youll see references to the L99 as a result. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. 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. 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? This new lawsuit is essentially identical to the previous. Pulled the inntake and replaced valleypan With all the solenoids. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. thx Brian, Knock on wood I drive a 2011 silverado 44 Ltd with the 5.3 AFM/DOD not tuned out or delete being used and have experienced no problems or any sign of problems for that matter juat rolled over 210,000 all original factory parts would you suggest I tune it out or juat let it ride I change my oil religiously and also use lucas products for all aspects of my motor. Ive heard the Brand name Range thrown around in other forums, This is how mine started outthen 6 months later on the highway the service stabilitrak light and flashing engine light came on. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. I have a noise in the engine but it seems to go away when revved up. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. GM switched over to the 4100 v-8 in 1982. 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. Not sure which direction to go from here. The market for nonhybrid gasoline-powered vehicles is expected to fall by 20 percent during that time, but with tech like smarter cylinder deactivationin these upcoming GM V-8 trucks, for . I would. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. Oil flows to the special lifters through theAFMtowers. Engine starts but is throwing a misfire on cyls 4,7. Is this an issue only with GM SUVs and trucks, or does it include cars too? [], [] LS Tech: How to Delete VVT or DisableAFM []. 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 have read synthetic isnt good for AFM lifters. 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. 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. What type of disabler did you go with? 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. Clean oil is crucial. It only has about 9k miles on it. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. i just bought a 2018 Silverado with the 5.3 it is the regulator guy! Chevrolet 5.3 Engine Issues and Recommendations They lasted one year with big problems. I got the AMF disabler anyway and so far so good. If you want to delete it entirely, its a M14 x 1.5 pipe plug or you could use the Improved Racing plug p/n IRP-814-M14-Kit. It is replaceable.. just remove oil pan and it will be on top at the filter. What makes you think it was a design flaw ? Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? Im always sorry to hear when people run into issues like these. All New lifters were from AC delco. Hello. Then it takes out the lifter again and again until you bite the bullet and replace the cam. I always have done my oil changes on time, not sure about the people who owned it before me though. They have plastic casing, so you can imagine what will happen with aged plastic. [] they have a downside? But yes ultimately, it might be time for a cam and any AFM lifters that werent replaced. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. Does the disabler prevent the engine damage in the first place? Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. so the trans fluid worked for you then? 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. 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. [], [] 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. 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. 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. in your opinion will this work, i really dont see any reason it wouldnt. I call it active obama fuel management .A scam . Thank you again for the response. My question is: do I install the electronic disabler on the new engine to avoid future issues? [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. They dont so any better than domestics on mpgs. (Non-AFM engines have a smooth cover.). lol. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. 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. .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. I had privilege to work on some of that garbage they never did work . . Thanks to a properly maintained 5.3 with AFM, I can routinely get over 20 MPG on the highway. 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. 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. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. 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. Brian, Loved the looks and interior and thought a I got a great deal at $6k even. With the nipple, or without? 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. Any problems to watch out for?Did you replace the VLOM? [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes Regards, As it turned out one of the cam bearings was failing and causing the cam to wobble (my guess) which messed up the AFM and probably some other stuff too. The wife however found this deal on an Envoy Denali . I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). You could also have tried that if the trans oil didnt work. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? In four-cylinder mode, they act like air springs and allow for smooth operation. 330-630-0240. Love the truck. 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. 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. All the time. My point is that the engine likely on uses dod a small percentage of the time so can not really imagine that the delete causes any more issue than normal which may be the high oil consumption but do all of these engines with dod consume a lot of oil? I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. I ordered a electronic disabler for it today. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? Took it to a shop and they advised that it could be due to the AFM system not functioning properly. I am wondering the same thing. I would say maybe 5% of my customers keep up on their oil changes. Chris, when you did your delete, did you also change the cam at the same time? 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. New plugs and wires. No other V-8 truck of similar weight can do that (except another GM with AFM). IMHO . Drives way better for my mostly paved road driving. I dont plan on installing the delete kit at this time. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. I just took a long trip and it used 1.5 quarts of oil. Toyota will be my next truck unless GM owns up and makes wright with consumers. The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. So I researched and got an AFM disabler. Remembered that after I bought my Tahoe. 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. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts.