It only has about 9k miles on it. I had to replace them all and the camshaft as well. A 14 gmc 5.3 Sierra 85000 miles Should I buy one to disable the V4 mode? An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. CHANGE YOUR OIL!!!!! Should I wait until the warranty runs out, or will that be too late to stop possible damage? Its ribbed with solenoids on the underside. It has the orings in place, that seals the towers. 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. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. Its a CA EMMISIONS TRUCK. I have 1999 5.3 Silverado that gets 19-20 miles to the gallon all the time this shit pile with dod only gets 14 miles to the gallon. so the trans fluid worked for you then? Active Fuel Management (AFM) is a trademarked General Motors technology that improves gas mileage by shutting down half of the cylinders under light-load conditions to reduce fuel consumption. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. I have a Yukon 116k it now needs its 3rd set of lifters and cam. 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 .
chevrolet - How does cylinder deactivation work? - Motor Vehicle is it still working good since you have done that with the trans fluid? Who knew? Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . Truck has an active P0300 code and runs very rough. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? 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 . Hello! Had nothing but trouble out of it. I would just have the AFM disabled (tuned out) then. The oil collapses the plunger inside the lifter. Had similar problems under warranty, no telling what they rigged me up with at the dealer. IMHO . We did take it apart to check for metal possibly being trapped inside, it looked like brand new. Call chevy.They should being paying most of that. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. 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? Plug the tuner into your GM vehicle's OBDII diagnostic port, and follow the instructions provided to update the engine control module's program The new program will make sure that AFM never engages. I am trying to find out of this is true.
Problems regarding Chevy 5.3L engines ticking noise and misfire. Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? Verified over hundreds of trips, makes no sense. 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? Welcome to socialism folks . I would. Are you saying that I am in the clear by a year and issues fixed? My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. Have an 06 Yukon with 5.3, original engine had bad knock, was told it was lifters so had them replaced. Hello. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. I own a reputable repair shop. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. A 17 with 5.3. Any guidance would surely be appreciated. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. 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.
GM Lifter Recall Needed, Says Class Action Lawsuit The computers had not evolved enough to control the sytem. The trucks are only supposed to use two four. Most of all, my concern is reliability. This lowers the cost of building it [], [] aluminum block engine. A 17 with 5.3. It could be the filter screen under the oil sending unit. Thats a tough call, if the warranty will cover itId let it run out. Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. it is the regulator guy! Battery was unplugged for a week.. 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 []. My 2012 Silverado 5.3L just did the same thing as your Tahoe Brian. Once the failure has occurred, the AFM shut off methods other than that probably wont work. Cant believe they havent fixed this in a decade. 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. I drive the same 320 mile trip every two weeks and drive the same route and full tank. 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. This is my project car and will be my drive (about 5000 miles a year). All I can say is they now try this again and they are still having trouble..when will they ever leave well enough alone. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. We chickened out though and just bolted the AFM solenoid plate onto the used engine. Ketil, let us know what you find out. A tuner can often fix that as well by giving it some more ignition advance in these regions. Was a disaster then but a profitable disaster. 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. Love the truck so far. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. 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? I have an 08 Suburban that is currently getting the lifters replaced a second time within a three month span. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. 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. Now Im here tring to figure out what to do. I have also heard that the oil pump is to be changed and I have also heard that it does not matter. Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. You were lucky that it worked. bought at Brian Tooley Racing ! Please report back if you have any issues, but I think you are in good shape. 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. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. 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. [], [] as the LS engine familys hybrid engine in trucks and SUVs.
GM Active Fuel Management Cylinder Deactivation Technology - GM Authority 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.
Active Fuel Management About Gone From 2022 Silverado Lineup - GM Authority Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. 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. I may just do that Vic. They learned that the oil level sensor was necessary and that we were supposed to have been advised that we needed to reuse the original oil pan. Its not GMs choice to use AFM. will feel like a jerk asking the clerk at lowes to cut them again. I have the towing package on my 13 Tahoe LTZ. The exhaust valve remains open during the intake stroke and closes just before BDC. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. She had driven it for a couple of months that way. The result is improved combustion chamber pressure as the piston approaches top . AFMlifters have a history of failing and oil consumption can be a problem.
How to Delete or Disable Active Fuel Management (AFM) on GM Engines I quites down to nothing after running for about a minute. . 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. Diablo says yes but they do not provide tunes. 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. This basically deactivates the cylinder deactivation system. Or not because it is the cast iron block and not he aluminum block? How long did it take? [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. any help? There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. Covers me to 100K. Is this an issue only with GM SUVs and trucks, or does it include cars too? if GM wont make a dependable truck for 60,000 Toyota is sure to take over even with very poor gas mileage .
PDF Service Bulletin Bulletin No.: 20-NA-038 Date: March, 2020 You are correct. The lifter seems to recharge whenever the truck sits for some time. I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. He used seafoam and changed to synthetic oil. On the caddis it helped to relocate the computer inboard the passenger compartment to keep them cool helped . 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. TheAFMcylinders are opposite of one another in the firing order. Number 7 cylinder lifters stops moving when truck starts. Can you tell me what needs to be done with the VVT? TheAFMsystem can be identified by its components. also in the pan is another AFM oil filter near the external engine oil filter. Side note, after 200 hundred miles of trouble free driving the transmission failed so we had to replace that too. changed oil , its all working now, but want to disable this sorry system. The 1st design (built prior to April 1, 2006) was had afm components but wasnt connected. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. 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. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. Pushing forward. You could also have tried that if the trans oil didnt work. 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. Bought an 07 GMC Yukon 5.3 with the AFM, 87k. There are no changes in the valves or the springs. When you eliminate the AFM system, the extra oil is no longer needed. If buying a tuner/chip which works best for that truck/engine? If I put my truck in manual 5, it doesnt try to go into V4 mode. 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. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! 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. Solenoids, new lifters also test voltage to solenoid pack all good their, 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. Change your oil. I have an 07 Silverado 1500 ltz. thanks brian love the info Im thinking of buying a ford now, I am going to buy a new truck in about a month it would be a Chevy but Dodge has lifter problems so they are out and Chevy has DoD problem.If they come out with Silverado without the DoD then i would buy one.But they arent so i will become a Ford man from now on, Have fun with that Ecobust motor & stretched timing chain . What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? My 5.3 is. No problems with any to this point. Its not possible to install them wrong? Is this the shield you referred to in a past post? 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??? I hate it. They dont so any better than domestics on mpgs. 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. Todays computers are faster so it does work. In four-cylinder mode, they act like air springs and allow for smooth operation.