Both comments and pings are currently closed. Main: Sales: Espanol: Service: IFC: Whatever the noise the best advice is to contact your nearest garage and get professional advice. Get quotes. This site uses "cookies" to give you the best possible experience when using the website. Using this website means you agree to our use of cookies. You can find out more information by reading our cookie policy. This guide will explore the various causes of the knocking noise, dependent on where the noise is coming from and when it is occurring Any unusual noise coming from your vehicle will ring alarm bells in your head.
A knocking noise is no different and is certainly not one to be ignored. Guide Contents: Why is my engine knocking? Car makes knocking noise when accelerating Knocking noise under the bonnet Why is my engine making a knocking noise? Engine knocking may also be the result of: Cambelt or chain issues Low oil pressure Valve lifter failure Blockages that are emissions-related Spark plugs aren't compatible Imbalance air-fuel mixture Worn bearings An engine noise that appears to be coming from the bottom of the engine is more likely to be because of damaged rod bearings than anything else.
Knocking noise when accelerating A knocking noise when you accelerate may well be an engine worn out with low oil pressure or a piston slap. If you are driving a high-performance vehicle that needs a highly compressed fuel and air mixture, then you will need fuel with a high octane rating of 91 or above.
But if the octane rating is too low, the air and fuel mixture will ignite before the spark is generated by the spark plug. This will cause those knocking sounds to be heard. If you are using the wrong type of spark plugs in your vehicle, then this could easily cause knocking noises from your engine.
Basically, spark plugs have different levels of resistance to hotter temperatures from the engine. This will result in a knocking noise in most cases. Gasoline needs to have a carbon cleaning additive to prevent carbon deposits from building up on the spark plugs, valves, and various other parts which assist in the internal combustion process.
Once the air and fuel mixture is ignited, carbon molecules can easily form on these parts if there is no cleaning detergent to wipe them away. If you regularly bring your car in for maintenance, you can have your mechanic add this cleaning agent for you.
Read also: 10 Causes of Car Engine Hesitation. It is important for the upper area of the cylinder head to receive oil for lubrication purposes. If the cylinder head is not adequately lubricated in this area, then you can expect knocking noises from the metal on metal contact. This is usually the result of loose lifters or valves which may not be getting the proper amount of oil they need. In any event, check to ensure that your oil is flowing properly to the cylinder head area.
Either you have an oil leak or perhaps your oil is too old and needs to be replaced. If you start up your car and hear knocking noises, this usually means the fuel of the car was not ignited properly. This could be due to low-quality fuel, bad spark plugs, or another reason above. If the problem is not fixed fast enough then it could damage the components of the engine, which would mean a hefty repair bill.
Instead of spending thousands of dollars on replacing the engine, it would be much cheaper to just repair the cause of engine knock before it does damage. Before taking your car to an automotive repair shop for an expensive diagnosis, there are a few steps you can take to try and get the knocking to go away.
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