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Bad bearing or rod

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Q: What is the cause of a loud knocking sound in engine compartment?
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What is car engine knocking?

When the fuel in an engine cylinder ignites prematurely or unevenly to cause power fluctuations and a "knocking" sound. usually occurs when an engine is very how or improperly timed.


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?


Why is my 2003 cavalier engine knocking?

Engine knocking can be caused by numerous things. Having the incorrect spark plugs, carbon deposits on the cylinder walls, and being low on engine oil may all cause a knocking sound.


What would be causing a knocking sound in your muffler?

A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.


What is the cause of a knocking from the front end of a 2000 Pontiac grand prix when driving at low speeds?

My 2000 Grand Prix would have a low-speed knocking noise coming from the drivers side as the CV axle was failing. The loss of lubrication in the CV Boots allows the joint to make a knocking/tapping sound at a low speed. If the knocking is coming from the engine compartment, then it could be an entirely different problem.


What would cause a knocking sound in a 1992 Cavalier while its running?

it might be a bent piton rod if you or water or somthing into the engine


Can catalytic converter cause a knocking sound?

Yes


When pushing on gas pedal you hear knocking sound in engine?

No


Your Daewoo lanos is making a knocking sound what do you do?

I would recommend taking it to a mechanic and have them listen to it. Everyone's definition of "knocking" is slightly different. Try not to drive it for too long; engine knocks can usually cause pretty severe damage to an engine.


Does the engine knock with a bad knock sensor?

NO it will not. If you have a knocking sound then you have trouble inside of the engine.


What would make a knocking sound in a 1987 Nissan 5 speed transmission?

A seized gear can cause a knocking sound on a 1987 Nissan 5 speed transmission. A blown gasket can also cause this sound.


What could cause a knocking come clicking sound under the dashboard without the engine started and just the electrics on?

if you have an electrical fuel pump can sometimes do that