Delphi’s Dynamic Skip Fire (DSF) technology is making its production debut in some versions of the fully redesigned 2019 Chevrolet Silverado with 5.3- … All cylinders, all the time! AFM, also known as cylinder deactivation is where the engine shuts off 50% of the cylinders under certain driving conditions in order to improve fuel efficiency. 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! If tries to compress, then when the piston goes down the air pushes down. 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. The AFM is a cylinder deactivation technology that alternates between V-4 and V-8 modes depending on load conditions. One way of doing this is using an AFM delete kit, which replaces the AFM components with standard engine parts. GMC Sierra 1500. 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 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. As of now, this seems to be the only concern of the Ecotec3 5.3 engine. Early builds were parcelled out to the automotive media with mostly glowing reports. 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+. Automotive electronics company Range Technology has released its new Active Fuel Management / Dynamic Fuel Management disabler for General Motors vehicles. Oil Pressure Relief Valve. Dynamic fuel management was recently announced and will shut off any number of cylinders to achieve its goals. What is DOD and why delete it or GM Oil Consumption Problems LS and LT. Summit Racing SpeedCard - Open a World of Possibilities - Apply Today! Nevertheless, GM has been working on them and it seems like they’ve managed to solve a great deal of the excessive oil consumption problems. I believe you are talking about active fuel management.It's an issue for some but that wouldn't keep me from buying a truck I like. This is my thir... 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 to the Rescue. 2020 2SS, M6, staying in 'Tour' on the freeway, top gear, in cruise. 2 yr. ago. Lifters. 3. These engines are the newer variable displacement design, which uses DFM rather than the older AFM system. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. 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. 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... While there are some pumping losses, the expansion acts like a gas spring. 2 yr. ago. The AFM system issues are one of the big reasons that GM transitioned to the new EcoTec3 engine family. Shop for cylinder deactivation delete combos at Summit Racing Equipment. Cylinder Deactivation: GM temporarily halts production of 3.0L Duramax diesel Back to video. 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. Problems that can be directly connected to cylinder shut off? Only show this user. What the biggest reported problem with Chevy Silverados? This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. 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. 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. Reply Like. The cylinder deactivation problems on the Gen 4 engines were massively blown out of proportion in my opinion. Bank 1 denotes the bank of the engine which contains the number one cylinder. The 4-6-8 engine debuted in 1981 to a lot of fanfare. 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. It was discussed on the forum when introduced to Acadia in 2017. does or has anyone heard of this and if so does GM have a fix for this, I'm talking about G's AMF system. Many of the complaints allege that these problems also affect the Chevy Silverado and GMC Sierra. One thing I heard a little bit about was something called cylinder deactivation technology. The 2007 GMC Yukon has 3 problems reported for engine failure. ... GM 6.2L L86/L87 Common Problems. • Engine oil pressure is between 187–455 kPa (27–66 psi) • Engine coolant temperature is between 40–129°C (100–264°F) tom3; Nov 16, 2021; Engine & Drivetrain; Replies 2 Views 336. February 22, 2017. Mazda had some issues with it as well in their 2.5L Skyactiv. GM offers the following diagnostic steps in determining if this is the problem. A recent GM class action lawsuit claims that GMC and Chevrolet vehicles manufactured by the auto company are equipped with defective engines. 1. This is the shield that GM is putting on their engines to stop the AFM from causing excessive oil loss. CT5, however, does not have a switch. You have the manual transmission, which does not have cylinder deactivation. Here is some info I found out: There are a few parameters that must be meet before AFM will kick in. 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. General Motors has played with cylinder deactivation technology since the days of Carter, sometimes successful, sometimes with more disastrous results. You can expect to get a 10-15% improvement in fuel economy with this feature. AFM on Gen IV and Gen V engines deactivate cylinder 1, 4, 6 and 7. Part Number: CMB-09-0032. Nov 16, 2021. And now, they've switch to a new design for the higher RPMs on the Gen 3. 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. 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. I had an 08 GMC with AFM which was the first year for it. 4.57 out of 5 stars. Your valve most likely didn't drop from the cylinder deactivation. It reduces the pumping losses of the engine under low power requirements by deactivating 4 of the 8 cylinders. The driver could cut power to three of the Sturtevant six cylinders by turning off one of the magnetos and lifting their exhaust valves. This gas acts as a spring, compressing as the piston rises in the cylinder, and helps to push down on the piston as it moves away from top dead center (TDC). After installing new lifters the original issue may not have been corrected. 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. Deactivating cylinders at light load forces the throttle valve be opened more fully to create constant power, and allows the engine to breathe easier. The vehicles seem to be failing with less than 10,000 miles on the odometer. Producing a cylinder deactivation system that is reliable, unobtrusive and avoids bad side effects has been more complicated. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. 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... 2020 2SS, M6, staying in 'Tour' on the freeway, top gear, in cruise. More Popular New & Used Trucks for Sale ›. Part Number: TFS-30678503. ... Also Amazon sells the Cylinder Deactivation Device … 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. Off the top of my head seems like it shows on the instant MPG screen and the average past 50 miles MPG etc. On BOTH the Ram's and GM/Chevy it's lifter issues, then oil issues. ... Standard, Head Bolts, Lifters, Chevy, GM LS, 5.3L/6.0L/6.2L, Kit. 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'm looking for a newer used truck. However the deactivation makes it worse. The cylinder deactivation system functions by doing two things: Close the valves. Chevrolet. 1. Got rid of the VVT. If you operate under low loads for short times, this will happen to every engine. The AFM deactivation process begins by first not opening the exhaust valve, trapping the combusted gas in the cylinder. Close the valve at any point. Posts: 583. Lerch. Answer (1 of 5): It Does have an adverse effect on the engine life, in the following ways. The 3.6L V-6 LGZ is a gasoline engine produced by General Motors for mid-sized pickup trucks and SUVs. It is an oil-operated system that deactivates the lifters on selected cylinders, closing the valves for those cylinders. The LV3 4.3L V6 motor was designed for primary use in pickup trucks and commercial vans. 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. Posts: 583. At least initially, the 4-6-8 worked as promised. 1. 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.

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