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    Knocking Noise in Engine – Inspection & Repairs

    What does a knocking engine mean?

    Inside a combustion engine, air and fuel are burnt to create energy, giving the car the power it needs to run. If the engine’s air/fuel mixture is not being burned correctly, your engine may produce a knocking noise. This happens due to fuel burning unevenly, rather than at a constant rate.

    Learn more about knocking engines >


    Common causes of engine knocking:

    There are many different things that can cause knocking in your car’s engine. Some problems can be easily fixed whereas others can indicate serious damage. Below are some common causes of engine knocking:

    Car running on low-octane fuel – The octane rating of petrol tells you how much the fuel can be compressed before it ignites. When gas ignites by compression rather than through the ignition system spark, it causes knocking in the engine.

    Carbon build-up on the cylinder walls – Low-octane fuel can cause a build-up of carbon contaminants of your cylinder walls. These carbon contaminants can affect your engine’s ability to burn the air/fuel mixture. This can also occur if you piston oil rings are worn. 

    Incorrect spark plugs – The spark plugs ignite the air/fuel mixture in your engine. Using the incorrect spark plugs can create deposit build-up and lead to improper engine temperatures. These two problems can cause knocking in your vehicle’s engine.

    Overheating engine – When an engine reaches high temperatures, the fuel can burn unevenly, causing a knocking noise. Overheating can often be caused by problems in your cooling system. If your engine begins to overheat, we recommend that you stop driving immediately to avoid a very expensive engine repair or replacement. 

    Damaged engine components – Various components surrounding the engine can wear out or break, causing knocking noises in your engine. Some of these include the camshaft bearings, hydraulic valve lifters, big end crankshaft bearings, conrod bearings, piston knock or slap,    water pump bearings. valve train bearings and valve rocker arms, 


    How important are repairs to a knocking engine?

    It is better to treat engine damage sooner rather than later. Unusual sounds including knocking noises from your engine indicate damage is occurring. Therefore the wear on engine components will increase, resulting in a bigger repair bill. Taking your vehicle to a mechanic will allow the problem to be diagnosed. That way, you can decide if it is worth fixing.


    Knocking Engine – Inspection & Repair in Hamilton

    At Grimmer Motors, our team of highly experienced and skilled mechanics can quickly determine the cause of your knocking engine or engine noises. We can then provide reliable, high-quality engine repairs.

    For engine repairs in Hamilton, contact Grimmer Motors today!



    Phone: 07 855 2037

    Email: office@grimmermotors.co.nz

    Address: 998 Heaphy Terrace, Fairfield, Hamilton

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