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Four Common Causes For Engine Knock

You are driving along and you hear that sound again; that knocking sound. Your engine has been knocking a lot lately, and we here at Buckeye Complete Auto Repair want to caution you that engine knocks can signal serious engine trouble. As such, it’s important that you have your engine inspected right away so that the source of the engine knocking can be found and fixed before you end up with further engine damage. Let’s talk about the causes of engine knock.

Carbon Deposits in the Combustion Chamber

No matter the brand, the gasoline that you put into your automobile has detergent in it that is designed to prevent carbon deposits. Despite this, carbon deposits will eventually clog your cylinders and your fuel injectors. This directly affects your vehicle’s ability to detonate the air and gas in the cylinders. The knocking that you are hearing is multiple detonations in each cylinder. It’s important to have a carbon cleaning done when it is needed.

Fuel That Is Lower in Octane Than Needed

Most engines can run on 87 octane gasoline, but high-performance vehicles often need higher octane levels. If you accidentally put the wrong octane in your tank, your engine will knock. Lower octane fuel ignites quicker, which means your high-performance engine is detonating it several times in the cylinders and, as with the carbon deposits, you’re hearing the multiple detonations in the form of knocks. Always put the recommended octane in your tank.

Rods or Rod Bearings That Are Broken or Worn

The piston located inside each cylinder is attached to a rod by a rod bearing. If your engine is old, you run a greater risk of breaking a rod or having to deal with worn rod bearings. This can cause severe engine damage. The reason why you are hearing knocking is that the pistons are knocking against the crankshaft walls. If left unrepaired, you will damage the crankshaft and render your engine inoperable.

Spark Plugs That Are Worn or Misfiring

Finally, because the spark plugs are in charge of firing up the air and fuel in the combustion chamber, misfiring can also sound like knocking. It used to be that spark plugs needed to be replaced every 30,000 miles, but today’s engines can go longer depending on the manufacturer’s recommendations. If your spark plugs are overdue for replacement, your engine knock could be attributed to that and you may also lose engine power.

Columbus, Ohio residents rely on Buckeye Complete Auto Care for all of their auto service needs. Call us today to schedule an appointment right away so we can get to the source of your engine knock and fix it.

Call Buckeye Complete Auto Care for all your Car needs at 614-285-3453

Photo by Nes from Getty Images via Canva Pro
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