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.
knocking noise
NO. A knocking noise in the engine is a problem in the engine.
A bad connecting rod bearing can do this
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Your transmission fluid might be low.
It can mean that the engine has a bad main bearing. Can also mean one of the pistons are bad.
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.
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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