gm cylinder deactivation problems

Most of the complaints show up in the 2009 to 2011 model years. I haven't had any issues and don't even notice when it does it most of the time. But I only have 700 mile on it so far. Problems that can be directly connected to cylinder shut off? Delphis Dynamic Skip Fire (DSF) technology is making its production debut in some versions of the fully redesigned 2019 Chevrolet Silverado with 5.3- The Computer Command Module that monitored and controlled the deactivation was said to be able to process over 300,000 operations per second. February 22, 2017. Specifically, the cylinder deactivation system closes the intake and the exhaust valves for the unneeded cylinders. The AFM cover is called the Lifter Oil Manifold Assembly (LOMA). There are only a couple of places in the DIC that show the V6/V4 symbol. Ford F-150. 1. Chevrolet 5.3 Engine Problems and Recommendations This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. 2022 GMC Sierra 1500 Denali Ultimate driver w-Super Cruise + HUD. Jan 16, 2018. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Here's how all three GM EcoTec3 engines in the 2014 Chevy Silverado and GMC Sierra shut down two or four cylinders at low power demand to reach 22 mpg AFM on Gen IV and Gen V engines deactivate cylinder 1, 4, 6 and 7. Off the top of my head seems like it shows on the instant MPG screen and the average past 50 miles MPG etc. The GM lifter problems seem to be most prevalent in the L84 5.3-V-8 and L87 6.2-liter EcoTec3 V-8 engines with build dates between September 2020 and March 2021. Replace the valley cover with a flat, non-AFM valley cover. While it does still use the GM Active Fuel Management cylinder deactivation technology that caused a plethora of issues on the gen-four Vortec 5300 engines, it seems that GM has solved the issues related to excessive oil consumption. To provide maximum fuel economy under light load driving conditions, the engine control module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders 1 and 7 on the left bank, and cylinders 4 and 6 on the right bank, switching to a V4 mode. With Tula Technologys Dynamic Skip Fire, GM is banking on the former. Cylinder Deactivation: GM temporarily halts production of 3.0L Duramax diesel Back to video. I am not 100% convinced that turning the AFM off permanently is the "BEST" solution I have a Hypertech hand held tuner that i used to set it to onl Google GM cylinder deactivation for the details. 2020 2SS, M6, staying in 'Tour' on the freeway, top gear, in cruise. CORRECTION: The original version of this article stated that Active Fuel Management cylinder deactivation allows trucks to idle on two cylinders. Engines operate as V-4s, with two cylinders shut off on V-6s and four cylinders shut off on V-8s. Follow GreenCarReports on Facebook, Twitter, and Google+. Chevrolet. GM 6.2L L86/L87 Common Problems. Reply Like. It also has an 2. We recently heard the next-generation small-block V-8 engines coming from GM will have a unique cylinder-deactivation capability that can reduce or activate from one to eight cylinders. It's not 100% efficient but the air (or lack thereof) can act like a spring in these cases. Ram's MDS system is also a common source of complaints regarding the way it engages, and Honda's system is associated with excessive oil consumption, ruined spark plugs, and reduced fuel economy. We say this not to excuse GM, but to explain that - for a time - a lot of automakers viewed cylinder deactivation systems as a good feature. tom3; Nov 16, 2021; Engine & Drivetrain; Replies 2 Views 336. De activation leads to low temperatures and generally the moisture accumulates and lets the crud build up. The cylinder deactivation problems on the Gen 4 engines were massively blown out of proportion in my opinion. The AFM deactivation process begins by first not opening the exhaust valve, trapping the combusted gas in the cylinder. The 4-6-8 engine debuted in 1981 to a lot of fanfare. Ford F-250. AFM, cylinder deactivation - temporary disable. the early years of cylinder deactivation at GM definitely had issues. You can expect to get a 10-15% improvement in fuel economy with this feature. A stored code P3400 means that the powertrain control module (PCM) has detected an abnormality in the cylinder deactivation system for engine bank one. Seems everyone has had trouble with cylinder deactivation. The AFM is a cylinder deactivation technology that alternates between V-4 and V-8 modes depending on load conditions. Carbon Build-Up in the Intake Ports. All six years of the seventh generation Corvette are among the cars included in a class action lawsuit filed this week against General Motors, alleging that a lifter recall should be ordered for GM vehicles with 5.3-liter, 6.0-liter, or 6.2-liter V8 engines.. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. Engine oil pressure is between 187455 kPa (2766 psi) Engine coolant temperature is between 40129C (100264F) 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. Only the automatics have it. 2022 GMC Sierra 1500 AT4X - Obsidian Rush interior_ front. A recent GM class action lawsuit claims that GMC and Chevrolet vehicles manufactured by the auto company are equipped with defective engines. j cAT. But neither of us will know why it actually did. Part Number: TFS-30678503. While there are some pumping losses, the expansion acts like a gas spring. The air in the cylinder can act as a spring. I'm looking for a newer used truck. Only show this user. And I don't know if there is atop speed. Answer (1 of 5): It Does have an adverse effect on the engine life, in the following ways. To get the maximum possible benefit, the valves have to be disconnected as well, and as GM learned with the V-8-6-4, that adds mechanical complexity to the system. Cylinder Deactivation to the Rescue. All cylinders, all the time! GM LS AFM Deactivation Lifter Issues We have noticed an increase in the issues surrounding the replacement of deactivation lifters in GM LS engines with Active Fuel Management or AFM. its ample torque is a treat and its no Does not vibrate while normal low speed cruising but when stopping. Murrow said: Cylinder deactivation has never bothered me in any car I've ever owned or driven. I got ~28 - 30mpg on the freeway, which I'm pretty happy with, but there's several places in the cluster screens where's there a V8 icon, but it doesn't change to anything. Turning off cylinder deactivation is possible in most Active fuel management-enabled cars. Engine has been running for greater than 30 s. Engine speed is between 700 and 2800rpm. Not questioning your knowledge or background. But the same way my statement might have came out a bit too "general" for your liking. I would like t Cylinder Deactivation (Active Fuel Management) General Motors Active Fuel Management engine control system has the ability, under certain light load driving conditions, to provide maximum fuel economy by deactivating 4 of the engines 8 cylinders. It is an oil-operated system that deactivates the lifters on selected cylinders, closing the valves for those cylinders. The concept is simple: use fewer cylinders under light loads to improve fuel economy. Automotive electronics company Range Technology has released its new Active Fuel Management / Dynamic Fuel Management disabler for General Motors vehicles. On the 5.3L V8, 4 of the cylinders are shut off, essentially making your truck a V4. Disable fuel flow. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. Lifters. The History of the 6.2L Engine by GMC. Only at light throttle. The suit was filed by nine plaintiffs in the U.S. District Court for the Eastern District of Michigan: Harrison, et al., v. On BOTH the Ram's and GM/Chevy it's lifter issues, then oil issues. If tries to compress, then when the piston goes down the air pushes down. Summit Racing SpeedCard - Open a World of Possibilities - Apply Today! Your valve most likely didn't drop from the cylinder deactivation. The vehicles seem to be failing with less than 10,000 miles on the odometer. 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. On the GMC side, the Sierra, Yukon, and Denali were all blessed with this powerplant. Here is some info I found out: There are a few parameters that must be meet before AFM will kick in. Also Amazon sells the Cylinder Deactivation Device Its ribbed with solenoids on the underside. Deactivating the exhaust valve first allows the capture of a burnt air/fuel charge or exhaust gas charge in the combustion chamber. The LV3 4.3L V6 motor was designed for primary use in pickup trucks and commercial vans. 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. Cylinder Deactivation Problems Today's cylinder deactivation systems are largely reliable, but they do introduce another layer of complexity that could go 4. The technology a result of the automakers 2012 equity investment in the startup via GM Ventures uses advanced digital signal Oil Pressure Relief Valve. General Motors has played with cylinder deactivation technology since the days of Carter, sometimes successful, sometimes with more disastrous results. Got rid of the VVT. Cylinder Deactivation Issues? It runs so poorly in that 4 You have the manual transmission, which does not have cylinder deactivation. This basically deactivates the cylinder deactivation system. Mazda had some issues with it as well in their 2.5L Skyactiv. CT5, however, does not have a switch. Certain 2014 Chevrolet Silverado 1500 and GMC Sierra 1500 models are being recalled due to a fire risk associated with their cylinder-deactivation systems, the Detroit News reports. Average repair cost is $5,600 at 165,700 miles. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. 2022 GMC Sierra 1500 GM Chevy Silverado Ram Ford GMC's. The driver could cut power to three of the Sturtevant six cylinders by turning off one of the magnetos and lifting their exhaust valves. The cylinder deactivation problems on the Gen 4 engines were massively blown out of proportion in my opinion. General Motors (GM) created the 6.2L engine as a part of their LS small-block series in 2007. It reduces the pumping losses of the engine under low power requirements by deactivating 4 of the 8 cylinders. Location: Erlanger, Kentucky 41018. I've had the AFM turned off on my 2014 for the 30k miles I had it from new with 0 issues and on my 2016 truck with 10k miles with 0 issues. Doesn't As far as concerns with reliability of the system, the LT1 engines rarely have any issues. However the deactivation makes it worse. We know that it still uses the Active Fuel Management cylinder deactivation technology which is the root of way too many Chevy 5.3 engine problems. 3. It would help if they rotate the firing cylinders so the temperature difference across the block would not get too much. Posts: 583. How It Works: Fuel injection. According to plaintiff Thomas Szep, GM vehicles with Generation IV 5.3 Liter V8 Vortec 5300 engines suffer from engine failure due to defects.. Location: Erlanger, Kentucky 41018. Nov 16, 2021. Close the valve at any point. Standard, Head Bolts, Lifters, Chevy, GM LS, 5.3L/6.0L/6.2L, Kit. So, with the 5.0's already being notorious for using more than a little oil as it is, I came here to see if anyone notices a lot of usage with this cylinder deactivation, and whether or not the 5.0 oil usage actually gets worse. New GMC HUMMER EV Pickup An All-Electric Supertruck; In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. Also interesting on the TSB is that engine oil consumption of vehicles with higher mileage (approximately 48,000 to 64,000 km (30,000 to 40,000 mi).. One way of doing this is using an AFM delete kit, which replaces the AFM components with standard engine parts. What issues do they typically have? Speaking of the NPP, I *think* when the engine goes into V4 mode the NPP valves partially close, too, even if you're in track mode. Miami-Dade. Engines contain pistons that move up and down in their cylinders, powered by the force of a gas-air mixture as it combusts, to turn a central crankshaft. Shop for cylinder deactivation delete combos at Summit Racing Equipment. Early builds were parcelled out to the automotive media with mostly glowing reports. The cylinder deactivation system functions by doing two things: Close the valves. I was told by the Corvette expert that on the C8 track mode totally disables cylinder deactivation. After installing new lifters the original issue may not have been corrected. Chevy Silverado and GMC Sierra trucks with the 5.3-liter V8 will lose 1 mpg combined due to their cylinder deactivation systems being, well, inactive. Only the automatics have it. You have the manual transmission, which does not have cylinder deactivation. Only show this user. depends on how much load there is on the engine. Auto stop/start, however, is an abomination, if you can't deactivate it. 2020 2SS, M6, staying in 'Tour' on the freeway, top gear, in cruise. I think the idea of cylinder deactivation being this horrible thing is overblown and outdated. The Hit and Miss Nature of Cylinder Deactivation Systems. Regardless of the AFM solenoid being commanded on or off. Realize you addressed one aspect of the cylinder deactivation (AFM) issue and that is it no longer goes into V4 mode. Like its predecessor, the LV3 V6 was built around V8's small block with a pair of cylinders removed. Yep. More Popular New & Used Trucks for Sale . Cylinder deactivation is not exactly a new engine technology, and while it was never widely adopted, GM first used it on some Cadillac models more than 20 years ago. Jeep Gladiator. Turning OFF the cylinder deactivation feature is undesirable because of the concerns regarding harmful emissions to the environment. However, it is an excellent feature to improve the mileage of your truck. You will likely get a warning from police or any other authority on the road if you disable it. I happen to agree with you on that. When I tune my current truck I'm going to ask if this is possible. So that at cruise on the highway you can dro Most lifters returned for analysis are found to be good. The 2007 GMC Yukon has 3 problems reported for engine failure. 3. Cylinder deactivation is very effective in reducing fuel and reducing the emissions of harmful gases. An engine designed and balanced for 4 cylinders will have poor balancing with 3 cylinders. These engines are the newer variable displacement design, which uses DFM rather than the older AFM system. The CTS has a disable switch for the auto stop/start, so it wouldn't be a concern of mine at all. Valley Cover. A class action lawsuit filed against General Motors alleges that 2010 through 2013 vehicles with Generation IV 5.3 Liter V8 Vortec 5300 engines are defective. 40,000 miles on mine. No problems. I never notice it. I did find that my 5.3 runs better on 89 octane. Doesn't like 93 though When cylinder deactivation is commanded ON, the exhaust valve for the deactivated cylinder is in the closed position, allowing the locking pins on the valve lifter to move immediately, and deactivate the exhaust valve. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. Find CHEVROLET Chevy small block Gen III/IV (LS-based engines) Cylinder Deactivation Delete Combos and get Free Shipping on Orders Over $99 at Summit Racing! Estimated Ship Date: Today. Answer (1 of 3): The cylinder deactivation feature doesnt CAUSE lifter failure. Does anyone know if cylinder deactivation within the 3.6 Liter V6 in our Colorados/Canyons deactivates the EXACT same two cylinders every time - or does it choose different cylinders at different times? Mazda had some issues with it as well in their 2.5L Skyactiv. Part Number: CMB-09-0032. The AFM system issues are one of the big reasons that GM transitioned to the new EcoTec3 engine family. Nevertheless, GM has been working on them and it seems like theyve managed to solve a great deal of the excessive oil consumption problems. That may include but is not limited to vehicles from Honda, Dodge, Ram, GMC, Chevrolet, Chrysler, Pontiac, etc. With the fuse pulled so the NPP valves are always open, V4 mode exhaust sounds terrible. Here are a few of the issues that youll want to keep on your radar if you drive a 2017 Chevy or GMC vehicle with a 5.3L engine in it. 1. Second, many of the actual issues with the cylinder deactivation was due to faulty injectors that were shipped to Cadillac. Rumor had it (from a very good source) that GM switched suppliers mid-year. The old supplier got upset and shipped, on purpose, a large batch of bad injectors. Going 60 up a mountain; 8 cyl, going 60 on the breeze way, on flat pavement; 4 cyl. 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. As far as concerns with reliability of the system, the LT1 engines rarely have any issues. Swap out the AFM lifters for standard lifters. The mileage is very close to being exactly the same. And now, they've switch to a new design for the higher RPMs on the Gen 3. By extending cylinder deactivation to all cylinders, DFM allows for a large variety of firing sequences. GM offers the following diagnostic steps in determining if this is the problem. Engine Block. Perform the Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing in SI. So I found a 2010 LS motor, put gen III lifters, Camshaft in it. It is also known as Displacement on Demand (DoD) or cylinder deactivation. Due to its ample power output, 6.2L LS-series engine landed in all the GM trucks and SUVs. Based on the Dynamic Skip Fire technology from a company called Tula, Dynamic Fuel Management allows the small-block V8 in General Motors trucks to operate in 17 different cylinder patterns. RAM 1500. So after getting the dreaded lifter issue (Cylinder 6) I decided to put a reman engine in with the DOD/AFM delete, so hopefully this wouldn't ever happen again- and due the fact that I had 190K miles on my 2007 Avalanche. 12-20-2010, 10:59 AM. Deactivate? DFM can have rotating cylinder deactivation patterns, such as 1/5, 1/3, 2/5, or 2/3, as well as fixed patterns, such as 1/4, 1/2, or 3/4. Cylinder Deactivation (Active Fuel Management) System Description. 1. Bank 1 denotes the bank of the engine which contains the number one cylinder. It was discussed on the forum when introduced to Acadia in 2017. It would depend on the load. If you got your foot to the floor it won't go into 4 cyl mode. If it tries to pull a vacuum, then when the piston comes back up the vacuum helps pull the piston back up. The newer Dynamic Fuel Management (DFM) is a more sophisticated system that can skip cylinder firing order in up to 17 different ways. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. However, you may require performing a few simple crucial steps to disable it in your vehicle. It's based on GM's 5th-generation small block 5.3 V8, replacing the 4.3 Vortec V6 out of the gen-4 small block V8 engine family. Sounds like a manufacturing/material defect or a misadjusted valve. I believe the Denali display won't show AFM mode on Denali's instrument panel at least through model year 2019 - hasn't been mentioned here for the 2020 refresh. The way I understand it is the truck only uses all cylinders when needed. Disable the AMF system with the Range Technology Disabler, or custom tune it out. 2 yr. ago. However, the lifters themselves can still fail, the solenoids in the Lifter Oil Manifold Assembly (LOMA) can still leak causing lifters to collapse, and there can still be glitches in the software causing the lifters to collapse. The first known car to feature cylinder deactivation is one youve probably never heard ofthe Boston-built 1905 Sturtevant.

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