Common Causes of Subaru Engine Knocking and Repair Solutions

Is your Subaru car producing a knocking sound from the engine area? Are you still unsure if it is just a simple problem that does not require much attention or a problem that will cost you a lot of money to fix? Subaru engine knock is one of the most frequently reported issues by the owners of Subaru vehicles, and if ignored, it can lead to many problems with your car. Engine knocking, also called detonation or pinging, is a knocking or rattling sound produced by your engine when it is running, and this noise is usually produced when fuel in the engine’s cylinders ignites unevenly or prematurely.

Ideally, the fuel-air mixture should burn in a controlled manner to produce smooth power or energy. However, when knocking occurs, the combustion process is interrupted, leading to the formation of shock waves that produce the knocking sound. If left unresolved, this problem can cause a lot of harm to the engine, ranging from worn-out pistons to damaged cylinder walls and even total engine failure. This is why it is recommended that the issue be resolved as early as possible when it is identified.

How to Fix Subaru Engine Knocking

• Use High-Quality Fuel: If you have been using the regular fuel grade, consider using the premium grade fuel. This can help prevent knocking resulting from pre-ignition. Also, the addition of fuel additives used to clean the combustion chamber can help avoid the formation of carbon.
• Spark Plugs: Always check your spark plugs for signs of wear and build-up of deposits. If worn, damaged, dirty, or old, it is advisable to use Subaru-recommended spark plugs. This simple change can enhance the combustion process and eradicate knocking.
• Carbon Build-Up: Carbon deposits on the engine may also cause a knocking sound. This can be resolved by using a fuel system cleaner or seeking the services of a mechanic to have the engine cleaned. In extreme cases, the mechanic may have to manually remove the intake valves and pistons for cleaning.
• Check the Knock Sensor: If the knock sensor is bad, it cannot sense knocking. You will have to take your car to a professional mechanic so that they can read the error codes from the Subaru’s ECU and fix the knock sensor if it is damaged.
• Overheating: Ensure that the coolant level is adequate and check for fluid loss in the cooling system. If the problem is with the radiator, thermostat, or water pump, then these parts must be fixed or replaced to avoid additional damage.
• Address Rod Knock: If you have diagnosed your engine with rod knock, it is advisable to seek the services of a mechanic as soon as possible. This problem usually calls for an engine rebuild or replacement of the bearings and is a highly technical job best left to a mechanic.

Can Subaru Engine Knocking Create a Problematic Ride for You?

Yes, Subaru engine knocking can negatively affect your driving experience. Knocking results from poor fuel combustion, rough running, poor acceleration, and low fuel economy. If the knocking continues, it can lead to serious internal damage, such as piston or bearing wearing, which would be very expensive to fix.

Also, loud knocking may cause your Subaru to become rough to drive, which may affect the smoothness and response of the car. If left unnoticed, it might lead to overheating or complete failure of the engine. Engine knocking is a very serious issue, but it can be prevented if one uses the right fuel, checks the ignition timing, and ensures that the car is adequately oiled.

Come To Our Experts At Franklin Automotive Fort Subaru Solutions

Franklin Automotive knows how essential it is for those Subaru vehicles to run optimally. If you are having an engine knock, our experienced mechanics will identify and fix the problem to avoid further straining the engine. Our shop is in Birmingham, AL, and we work on Subaru and other European and Asian models. However, we also serve Hoover, Pelham, Homewood, Vestavia, Mountain Brook, and Trussville, AL.

Whatever may be the cause of the knocking sound in your car, be it fuel quality, timing, or worn-out components, we are well-equipped and capable of handling it. Call us today and schedule an appointment, and we will bring your Subaru back to its best form.