Usually, a knocking engine is very bad, and requires replacement or rebuild of the engine. If the engine is going "clank-clank-clank" at idle, and the sound gets louder when you get on the gas and disappears for a sec or two when you let off, that means you gotta replace the engine. You ain't gonna go for but a couple more miles before you throw a rod....
knocking noise
NO. A knocking noise in the engine is a problem in the engine.
When your engine has a knocking noise, it could mean that a rod has been thrown. It could also mean you are low on oil.
A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.
sell it
The knocking noise is commonly called spark knock. The knock can be called by the engine timing not being set correctly, or using gas that has too low of an octane for the engine.
A knocking noise can occur from worn engine mounts. When the rubber insert on the engine mounts are old and brittle the chassis is not protected from the weight of the engine. Creating loud vibrations that get louder as the vehicle goes faster.
Having a bad rod bearing could cause a truck to make a loud knocking noise and shake when driving at high speeds. The engine having a coolant leak or an engine timing problem could also cause the knocking noise.
it could be your valves or your engine
can you elaborate? engine noise? stationary/moving? ticking, tapping or a definite knocking?
Noise coming from engine in Oldsmobile Cutlass could be as a result of an oil leak in the rear of your engine. This makes the gears to wear off leading to severe knocking noise.
Crank Shaft.