In other words, you’ve already caused some engine damage.
The system also includes an oil pressure relief valve in the oil pan to regulate engine oil pressure to the engine lubrication system and the oil manifold. Each solenoid allows pressurized oil to flow to the AFM valve lifters. The oil manifold consists of 4 solenoids that are closed until activated by the ECM. How the Active Fuel Management oil circuit worksĪ valve lifter oil manifold assembly is bolted to the top of the engine block beneath the intake manifold. However, the ignition system still provides high secondary voltage to the spark plugs and the spark still jumps the gap on the deactivated cylinders. The capture of exhaust gases in the combustion chamber contributes to a reduction in oil consumption, noise and vibration levels, and exhaust emissions when operating in V4 mode.ĭuring the transition from V8 to V4 mode, the ECM turns the fuel injectors OFF on the deactivated cylinders. 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.ĭeactivating the exhaust valve first allows the capture of a burnt air/fuel charge or exhaust gas charge in the combustion chamber. The force exerted by the valve spring is acting on the side of the lifter locking pins, preventing them from moving until the intake valve has closed. The ECM times cylinder deactivation on an intake stroke when the intake cam lobe is pushing the valve lifter up to open the intake valve against the force of the valve spring. The intake and exhaust valves aren’t deactivated at the same time. The outer housing moves with the cam profile while the pin housing remains stationary and does not operate the push rod. That unlocks the pin housing from the outer housing. When the ECM commands the V4 mode, the locking pins are pushed forward from oil pressure from the valve lifter oil manifold (VLOM) assembly solenoids.
#SNAP ON MODIS ULTRA CYLINDER DEACTIVATION DISABLE FULL#
The housing contacts the camshaft lobe with a roller.ĭuring full V8 operation, the locking pins lock the pin housing and outer housing together so the AFM lifter work like and ordinary valve lifter. The housing contains a plunger that works with the pushrod. The valve lifters in these engines are fitted with spring loaded locking pins that connect the internal pin housing of the lifter to the outer housing.
When commanded ON, the engine control module (ECM) commands the AFM system to deactivate cylinders 1 and 7 on the left bank and cylinders 4 and 6 on the right bank. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions.
GM’s Active Fuel Management (AFM) works under certain light load driving conditions to maximize fuel economy by deactivating 4 of the engines 8 cylinders. Before you go there, you must first understand how the system works, because performing a disable on an engine with worn active fuel management components may cause additional damage. There are two ways to disable active fuel management on a GM vehicle, but first you have to determine whether your engine is a candidate for the delete or disable procedure. Make and Model > Chevrolet > camero > Disable Active Fuel Management Disable Active Fuel Management Should you delete Active Fuel Management on GM engine? Read this before you delete active fuel management cylinder deactivation
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