It’s not unusual to hear a car engine knocking from time to time. Sometimes, this is simply the result of metal against metal when the car is moving. Other times, it could be a sign that something is wrong with the engine or the exhaust system. In either case, there are ways to fix the problem.
What Causes Car Engine Knock?
If you’re ever experience a persistent knocking noise coming from your vehicle’s engine, there are a few potential causes. Here are three of the most common:
1. Timing Chain Issue
A timing chain issue is often the result of failed or worn gears in the chain. When this happens, the camshafts that drive the valves don’t have enough power to keep them open at the right time, which results in an incessant knocking noise. To diagnose and fix a timing chain issue, your mechanic will need to remove the engine cover and inspect the chain and gears.
2. Bent Valves
If valves are bent or out of alignment, they can cause excessive knocking noise when the engine is running. Your mechanic can use a special tool to straighten out these valves, if necessary. In some cases, however, replacing all of the valves may be necessary to fix the problem.
3. Damaged Oil Pump
A damaged oil pump can also lead to a persistent engine knock. This problem is typically caused by debris getting caught in the teeth on the impeller inside of the oil pump, which causes it to malfunction.
How to Fix Car Engine Knock
If you hear a knocking noise coming from your car’s engine, there may be a simple and easy solution. Follow these steps to fix car engine knock:
1. Check the oil level. Low oil levels can cause knocking noises in engines. Make sure your car’s oil level is properly maintained and topped off.
2. Clean the engine. Engine knock can be caused by debris or carbon build-up on the engine’s pistons and valves. Clear away any obstructions with a quality engine cleaner, then dry off the area thoroughly before re-greasing the parts if necessary.
3. Inspect the spark plugs. Dirty or fouled spark plugs can also cause knocking noises in an engine. Change them as needed, then clean the insulators with a wire brush and gasoline to remove any built-up residue.
4. Replace worn or damaged parts. If none of these steps fix your car’s engine knock, it may be time to replace worn or damaged parts. Replace spark plugs, rings, valves, and piston assemblies as needed.
Conclusion
If your car engine is knocking, there might be a problem with the cylinder head. A knock can mean that one or more of the valves in the cylinder head are sticking, or knocking. If you have an automatic transmission, it may need to be serviced because it could also mean that one or more of the gears is worn out and needs to be replaced.