when a engine is knocking?
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Knocking (also knock, detonation, spark knock, pinging or pinking) in spark ignition internal combustion engines occurs when combustion of some of the air/fuel mixture in the cylinder does not result from propagation of the flame front ignited by the spark plug, but one or more pockets of air/fuel mixture explode ...
1220795
The cycle begins with a downward piston stroke, which draws a mixture of air and vapourised fuel through the intake port into the combustion chamber. The upward stroke of the returning piston compresses this mixture to around one-tenth of its volume, at which point it is ignited by the spark plug.
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Improper combustion of fuel and air can cause the knock sensor to malfunction. ... Another symptom of a faulty knock sensor is the misfiring of the engine on starting, accompanied by unusual vibrations throughout the vehicle.
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Some new cars equipped with push-button starters have an audible warning that the engine is on after you walk away: Ford, GM, Honda, Hyundai, Mazda, Mitsubishi, Nissan, Subaru and Toyota all have this feature.
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A bad spark plug may cause your engine to sound rough while idling. The vehicle-encompassing, jittery sound will also cause your vehicle to vibrate. It can indicate a spark plug problem in which a cylinder misfires only while idle.
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Valve keepers have been known to get kicked out, letting the valve drop far into the cylinder and cause serious damage. So, revving the engine, if it has accumulated wear, can be destructive to the engine. It may sound great, it may cost you.
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["The engine idles roughly. The sound of your car's engine should be constant and smooth. ... ", 'You have trouble starting your car in the morning. ... ', "Your car's engine misfires. ... ", 'Engine surge or hesitation. ... ', 'High fuel consumption. ... ', 'Lack of acceleration.']
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One symptom of a bad knock sensor is the engine doesn't feel right while driving at speed, or while the vehicle is carrying a light or heavy load. If you notice something seems off with your vehicle, even if no light illuminates, it is best to have your car checked out by a mechanic.
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Engine Mountings/Foundation When the AC is turned on, the mountings undergo additional strain due to immense starting load. So any issue in the mounts will result in shakes or vibrations. The broken mount can lead to increased vibration and noises especially when the compressor of AC puts pressure on the engine.
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It's the same for a compressor with a broken spring. When the air conditioner turns off, the pump loses momentum, which can cause it to knock against the case of the compressor and create a banging or slamming noise. ... The sound isn't necessarily an indication that the compressor will fail anytime soon.
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One of the telltale signs of a suspension system that requires service is unusual noise. As shocks and bushings wear, they lose their ability to properly support the strut. ... When the strut bottoms out, the metal-to-metal contact can cause a knocking sound that emanates from the front or rear wheels.
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If it's a one cylinder engine, just crank it, if you feel the resistance of the compression on every turn of the crankshaft, it's a two stroke engine, if you feel the compression on every other turn of the crank, it's a four stroke engine.
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['Increased difficulty starting the car. ... ', 'Occasional or frequent stalling. ... ', 'Knocking sounds or rough idling/acceleration. ... ', 'Bad gas mileage. ... ', "Pay attention to manufacturer's recommendations."]
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['Engine Misfiring and Lacking Power. When an engine misfires, it is a problem with the valve timing. ... ', 'Metal Shavings in the Engine Oil. This is something that will only be noticed when you have an oil change. ... ', 'Engine Failure. ... ', 'Engine Light is Illuminated. ... ', 'Rattling Noise When Idling.']
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A two-stroke, or two-cycle, engine is a type of internal combustion engine which completes a power cycle with two strokes (up and down movements) of the piston during only one crankshaft revolution. This is in contrast to a "four-stroke engine", which requires four strokes of the piston to complete a power cycle.
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A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either direction.
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This vechicle should have a timing chain which ideally is designed to last the engine's life. You'll hear a sort of slapping noise when they go bad and then it'll need to be replaced. Otherwise, timing chains don't require maintenance.