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We’ll find out why you hear the annoying sound and fix it. Why is my motorcycle engine knocking A motorcycle engine knock likely happens because of premature detonation. Make sure to put the right octane in your engine to avoid unnecessary engine knocking.Ĭall Techway Automotive in Dothan, AL, or our shop in Blakely, GA, if your engine knocks. High-octane fuel, such as 91, burns faster than low-octane gasoline. Fuel Octane Issueįinally, you know how we talked about multiple detonations in the cylinders above? Well, the wrong octane in your engine can also make this happen. This sound is coming from the belt, the tensioner, or a damaged accessory pulley. If the belt stretches or any of the pulleys get bent or damaged, you might hear knocking sounds coming from the engine.
Engine knock series#
Your vehicle’s accessories are powered by a belt and series of pulleys that run through your engine. The sound you hear is the pistons knocking against the crankshaft walls and this can lead to devastating engine damage.
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Rod engine knock is caused when the rod bearings are worn and they cannot support the pistons in the crankshaft any longer. Worn rod bearings can pretty much kill an engine for good. If the ECU or knock sensor is going bad, they will not be able to process the data from the combustion chamber and correct any detonation issues. Your vehicle has an engine control unit (ECU) and knock sensor to ensure the timing and detonation are correct at all times. Excess air slows down combustion and can be caused by clogs in the fuel system or incorrect air-to-fuel ratio measurements. The combustion mixture must have enough gas in it to fire up and burn quickly. If there is too much air in the mixture, the detonations will also multiply and knock in the cylinders. If spark plugs aren’t firing in the right order – bad timing – there could be multiple detonations that make knocking sounds in the cylinders. This creates combustion, which your engine uses to start and run. Detonation Timing Issueįuel injectors spray gas into each cylinder where it’s mixed with air and set on fire by the spark plugs. This can be caused by a disconnected vacuum line, leaking intake gaskets, or a weak fuel pump. This sound is usually sharp - like someone taking a hammer to the inside of the engine. Usually that doesn't result in loss of power, but the noise might discourage you from pushing the engine. Here are six common reasons why an engine will make knocking sounds while idling or while in motion. The engines knock sensor (or sensors) detects preignition and detonation, potentially damaging forms of abnormal combustion. First things first with a lean fuel mixture, you may have a check engine light on for codes P0171 and P0174, a lack of power, stalling concerns, and not to mention the whole reason you’re here, engine knocking. Just so we have a common understanding of the terminology: A knock is an extra noise from the engine. Techway Automotive can inspect your engine and find the cause of your engine knock. Bad engine detonation can cause catastrophic engine failure if the problem is left unchecked. And, to lower the likelihood of this happening again, consider filling up at a station that uses TOP TIER™ gas.An engine knock can usually be attributed to a detonation problem, which is why the knocks shouldn’t be ignored. For others, it might be wise to have the engine components professionally cleaned. In some cases, you may only need to add a fuel injector cleaner. However, carbon can still build up in your engine over time, especially if you're driving a vehicle that's been around for years. Your Engine Has Carbon DepositsĬarbon deposits are much less likely now that all fuels are required to have detergent additives. Both of these could cause a weak spark-or lack of spark-that might cause knocking. However, old spark plugs that are wearing out can also cause knocking. It usually happens when the engine’s running, but sometimes you can hear the sound while it is idle or revving up. If the knock has started after you've had the spark plugs replaced, the new spark plugs may not be the right type. Engine knocking occurs when the fuel in your engine’s cylinders burns unevenly, and this causes knocking or a pinging sound. It's the spark formed by these spark plugs that ignites the fuel and air mixture, causing the combustion that powers your car. The spark plugs play a crucial role in the functioning of gasoline engines.