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Chevy Silverado V8 To V4 Problems - Tools Bible Then had to drive the truck back to Tampa from Cheifland Fl. We recommend taking the truck to a local chassis dyno tuner and talking with them about a reflash. 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. Thanks. . The Hit and Miss Nature of Cylinder Deactivation Systems I noticed this discussion mainly addresses Chevy Silverados and other trucks? NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades. I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. Because its not just GM that have engine problems. I call it active obama fuel management .A scam . Im considering just replacing the 5.3 ( should be LMG, 2007 YUKON ) with the L96 crate engine. 2 15 with 5.3 Sierras both with 100k and Yes, always change all the lifters at once. The only solution is to replace the entire cylinder head. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. Basically rebuilt most of the engine while in the vehicle. I have had some say that it is the valves and others say that it is the cats plugged. A 14 gmc 5.3 Sierra 85000 miles I have a 07 Yukon with 180K and no issues what so ever. Is the Pressure relief valve replaceable? It only has about 9k miles on it. The 1 Big Problem People Are Having With the Chevy Silverado - MotorBiscuit I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes The problem:. 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. Because I want to. Im praying that my RangeTech buys me a few years. The lifter seems to recharge whenever the truck sits for some time. This should be added to your earlier model if you experience oil consumption. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. 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. 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. No problems with any to this point. At this state, a disabler would probably do what you need it to do. Chevrolet 5.3 Engine Issues and Recommendations 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??? If buying a tuner/chip which works best for that truck/engine? They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. Plus the 5.7 has its own problems with VVT reliability and the rest of the truck is flimsy junk. 50,000 miles. Required fields are marked *. 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?? 5.3-liter Chevy Engine Problems: What Should You Look Out For? My fear now is not will it happen but when! Thats not all bad because it saves the cost of an AFM delete kit. Some drivers want V8 power under their foot at all times. He used seafoam and changed to synthetic oil. [], [] as the LS engine familys hybrid engine in trucks and SUVs. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. [], [] LS Tech: How to Delete VVT or DisableAFM []. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Hi Mike, the metal shield you noticed is probably the windage tray. 4,7 plugs foul runs rough at idle. any help? Brian, I have the same question as Scott. Excess oil will be pushed out of the pressure relief valve into the oil pan. Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors.It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy.Estimated performance on EPA tests shows a 5.5-7.5% improvement in fuel economy. 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. I sold them when they were new. I speak from some experience. Regardless of the AFM solenoid being commanded on or off. I went with the new motor for the warranty. This system is the most effective way to disable AFM. 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 []. It was well researched and tested back in the late seventies and eighties . The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. He unstuck it and I took it for a drive and same thing happened. But the problem at that time was the computer technology. TheAFMsystem can be identified by its components. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. The older truck gets 19 mpg the newer truck with fuel management gets 14. How about if they just let us have a manual transmission agains for fuel mileage? Open to suggestions about best course of action. I am trying to find out of this is true. I drive the same 320 mile trip every two weeks and drive the same route and full tank. However, they are only functional on engines that usedAFM. I dont plan on installing the delete kit at this time. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. 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. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. Remembered that after I bought my Tahoe. She started to have the lifter problem again after 60,000 miles more. Im curious as to how much tran fluid you put in? 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. whith a disabler. It has plenty of oil pressure and I put all new lifters in it. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. In other words, the crankshaft and bearings were not visible. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. 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. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. Thanks for the detailed post! And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. When you eliminate the AFM system, the extra oil is no longer needed. the vehicle has 120,000 on it and 30 to 60 psi of oil pressure never lower or higher. 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. 2011 Chevy Avalanche LTZ. 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. The valve itself is part number W0133-2574213. 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. You may want to update your post. 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 ! 190k on the motor always ran AMSOIL full synth since new. Any thoughts or suggestions would be appreciated. You cannot compare them to old 350s. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. how many miles do you have on your engine? Ever since that which was Feb/March 2020 i get a intermittent rattle does not do it all the time and I am not getting any codes i.e. With 40000 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? They are taller and have special oil holes. In the mean-time I found that you can keep the engine from going into 4 cyl mode by using the manual shift (if so equipped) and keeping it out of 6th gear. Power will be sent to the rear axle via a beefed-up 4L60E [], Have a problem with 09 Chevy Cant believe they havent fixed this in a decade. My Wifes 17 Buick with afm was my attempt to get back to gm. This basically deactivates the cylinder deactivation system. 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. Have a lifter problem on my 2010 5.3 Silverado. The dealer in Rockhill, SC when asked only said they had not had a problem. Install an AFM Delete Kit Dont drive it if you have a dead cylinder due to afm failure. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? Delete the AFM, buy a tuner/chip, take it to a performance place and get an actual tune done that fixes it, replace the AFM lifters with non AFM type, change other engine components with thisetc..etc..etc??? The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. This happened on a camping trip with my kids last friday night. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. I only had 81k on the motor. Shame this happened. Verified over hundreds of trips, makes no sense. I recently bought a low mileage 2013 Silverado and the lifters collapsed. If someone didnt want to spend gas buy a Toyota. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. The engine is running on only four cylinders. [] 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. The oil collapses the plunger inside the lifter. One month to the day driving on the highway got the Service Stabiltrak message quickly followed by the misfire code. However, the fuel savings are not always as much as expected. How to Deactivate AFM, DFM, MDS, and Start/Stop To Prevent - Holley Most will want to get rid of the AFM immediately. Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. 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. It is also known as Displacement on Demand (DoD) or cylinder deactivation. I also notice that it doesnt go into V4 when it is cold. Disable the afm. Thank you. In four-cylinder mode, they act like air springs and allow for smooth operation. Thanks. Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? 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. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. 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. 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. Why would GM ever produce such problems with such little to gain. Fortunately I received a reducing in house shop hourly rate. A 17 with 5.3. I will be installing the AFM deactivator tonight when I get hoe. He stated if I continued to exceed 4500 RPM it would blow the lifters out. Hello. My local mechanic suggested whatever I buy with an AFM he will send off the ECU to have the AFM flashed out. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. A 17 with 5.3. Traded it with 180K miles and did not experience any problems. I just bought a 2015 5 3 17000 miles I was thinking about eliminating the 4-cylinder if I delete it with just the programmer will it hurt my motor? of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. (Non-AFM engines have a smooth cover.). Oil flows to the special lifters through theAFMtowers. Thanks for your help. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. I have a 2007 Gmc Envoy Denali with LH6 cant find a good LH6 engine but I found a 2011 LC9 engine w 52000 miles will everything plug up or what am I getting into? Just pulled it down in the garage there was no other damage , luckily. 1. Any truth to that? Engines with AFM use a high-volume oil pump. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. If I were to put a 2006 5.3L in a 2007 Avalanche and buy the unit to plug into my OBD2 port would it work? My 5.3 is. But it also restricts passages that the oil runs through. GM offers the following diagnostic steps in determining if this is the problem. the body is in great shape. With the nipple, or without? Replacing engine due to issues caused by AFM. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. Ditto , never buy a throw away vehicle again is my recommendation and my fix . Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. A 14 gmc 5.3 Sierra 85000 miles I read something the other day which I found to be funny. is it still working good since you have done that with the trans fluid? Double digit MPGs in my 98 K1500 would be a dream lmao. I love the car so far. If possible, will simply not using VVT provide a powerful,good running engine? You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). 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. Toyota has their own problems. Should I buy one to disable the V4 mode? 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. Are you saying that I am in the clear by a year and issues fixed? Why this happens is a more . [] they have a downside? I always have done my oil changes on time, not sure about the people who owned it before me though. NOTE:If you were in a situation where youve installed the AFM delete kit, but dont have access to a programmera disabler can still be a viable option. 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. Told her that it would not last and that she needed to find a different way to get around. My ignition lock cylinder is completely stuck in lock position with the steering wheel locked as well. The wife however found this deal on an Envoy Denali . There are so many moving components in an engine these days as opposed to the past. Should I wait until the warranty runs out, or will that be too late to stop possible damage? These trucks cost too much to have a terrible product. Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. Have misfire code and engine has what I would call a surge while driving. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? The biggest problem is nobody changes their oil on time. Ketil, let us know what you find out. If you are using VVT, you could use the NAL-12612273 (L92) cam. Engine starts but is throwing a misfire on cyls 4,7. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. Friend will send to me from Arizona. I have no clue what to do now. The computers had not evolved enough to control the sytem. All the time. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. 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. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. Your email address will not be published. My question on a 2007 Chevy Tahoe 5.3 AFM [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. [] Here is a guide on how to turn off AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Guide to disabling AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Here is an article on how to deactivate AFM. I have a 2012 Chevy Avalanche. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. We were getting a code that the cam position sensor was not functioning properly. 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. Im crossing my fingers it does the trick! Solenoids, new lifters also test voltage to solenoid pack all good their, A lot of drivers reported losing 2-4 quarts of oil in between oil changes. The exhaust valve remains open during the intake stroke and closes just before BDC. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. The lifter came apart and chewed up the lobe on the cam Im selling it I also told my friend at work when he asked me about my truck .I said Ill never by another GM ever. They may be able to find some of those missing ponies. The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. 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. New plugs and wires. I wii be using this truck to haul a camper for full time RV living and am thinking of a tuner to shut off AFM and maximize performance and economy. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? Have an intake and Borla exhaust. Loved the looks and interior and thought a I got a great deal at $6k even. So for all of you that continue to complain about how bad these things are. I recently bought a 2018 Silverado 5.3L with AFM. Another General Motors 5.3L V8 Lawsuit Filed | GM Authority Its a CA EMMISIONS TRUCK. Ive been reading, with disgust and concern of the lifter/cam situation. AFM - active fuel management strategy which deactivates the lifters on specific . Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. On the AFM lifters that dosnt work i have installed them With the oil hole Down! 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. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . We chickened out though and just bolted the AFM solenoid plate onto the used engine. Most will want to get rid of the AFM immediately and VVT isnt for []. Does the Pressure relief vavle ever go bad?? Another option is to plug it entirely if the AFM is already removed. Billy, there is some interesting trivia here on the L92. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. I can literally drive from Seattle to Redding CA on one tank. Ayush Srivastava A tuner can often fix that as well by giving it some more ignition advance in these regions. Will the plug in deactivater fix the oil consumption or will it cause more consumption? I had the same issue and had to have the AFM information deleted from the computer and the car tuned. What Is Hemi MDS? - MotorTrend Given that, would you recommend buying one of the OBD-II devices to disable AFM? Pushing forward. 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. Does the disabler prevent the engine damage in the first place? Just one. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. Runs better than new now and no more oil consumpsion!! So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. There may be an ignition related issue on that cylinder. 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.

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