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Low oil level....or bad lifter(s) for you pistons. Bad valves. Probably lifters.
Answer:Is the knock from the engine or transmission? In gear or in neutral?This could be a harmonic balancer (crankshaft pulley), loose torque converter bolts, low oil pressure, etc...or maybe a problem with the timing belt.
It is unlikely to be valve lifters. You'd likely hear bad lifters at all times. Lifter noise just at idle suggest oil pressure concerns such as low oil level or failing oil pump or even a sticking oil pressure regulator.
If you had a knock from pistons, crankshaft bearings, etc...you would also hear it most all the time, and louder when the engine was under load like accelerating from a stop or going up hill.
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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.
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 would cause a loud knocking noise in engine upon starting?
Running too lean.
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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Sorry, disregard this question, I didn't word it properly.
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sell it
Knocking noise when accelerating?
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