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Typically not enough oil. Bad spark plugs or the wrong grade of gasoline or a bad O2 sensor can also contribute.

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16y ago

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Related Questions

What would cause a loud knocking noise in engine upon starting?

Running too lean.


Can a bad harmonic balancer make a knocking noise?

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.


Can the timing chain on a 92 olds cutlass ciera cause knocking noise at idle-- the noise disappears when rpm is increased with the serpentene belt off there is no knocking noise with engine running?

Sorry, disregard this question, I didn't word it properly.


What would cause a loud knocking noise coming from the engine at 70 mph and make the truck shake very badly?

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.


Knocking in the bottom of the engine?

knocking noise


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Crank Shaft.


What would cause a knocking sound when not stepping on the gas?

can you elaborate? engine noise? stationary/moving? ticking, tapping or a definite knocking?


There is a knocking noise in the motor of my 1992 town and country. Could this be the transmission going?

NO. A knocking noise in the engine is a problem in the engine.


What could be causing a knocking noise when coasting in my vehicle?

A knocking noise when coasting in a vehicle could be caused by issues with the engine, transmission, suspension, or brakes. It is important to have a mechanic inspect the vehicle to determine the exact cause of the noise.


What does it mean when your engine has a knocking noise?

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.


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What would cause a knocking noise when the engine is warm?

maybe the carberator i dont know im not a machanic or anything

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