You have to locate the source of the noise then repost your findings.
Maybe a bearing in the compressor
hippo's make a sort of groaning noise and a roaring noise.
Maybe you have a miss in your engine?
There could be a humming noise from the engine of a 2002 Toyota Corolla because of low oil or a fouled spark plug. It can also indicate a more serious problem.
It makes a kind of groaning, but really really deep!
The fuel injectors make the ticking noise you hear at startup, especially when the engine is cold (colder temperatures).
That is lifter noise, they probably need adjusting
the power steering pump is worn out making internal gears of said pump produce that groaning noise. if not taken care of it will aventually fail.
Probably the best description of how the TARDIS sounds when it materializes or dematerializes is that it makes a wheezing, groaning noise that goes in a cycle. A video of that sound is below...
Difficulty engaging gears and noise when actually engaging
mine needed power steering fluid
1998 rav4 engine wont idle and clacking noise from under timing belt cover
If the Honda Accord makes a groaning noise when reversing the can be caused by bad hub bearings. Hub bearings are what allow the car's wheels to spin, if gone bad they can cause wheels to come fully off the vehicle.
Check the level of the power steering fluid. A low level or no level of fluid will cause the groaning noise.
Noise. Without noise, it can't work. Noise is in an engine, and without it does not work. Every engine has to make some kind of noise, internal or external, inside or outside the engine.
A toilet flushing that creates a groaning sound in the pipes of a house is usually caused by gas buildup in the lines. As the waste and water pass through, it displaces the gases causing the audible noise.
State your noise.
Yes they make a mooing noise. Also moaning and groaning noises. See related link to hear the sound of the camel..
Insufficient information is given - but it could possibly be a sticking valve lifter that quiets down and the noise goes away after the engine is warm and the oil is circulating.
check for leakage from trans master cylinder to slave cylinder at bellhousing. other things. ?? worn synchronizer gears / worn clutch
I think it needs a nose job, a.k.a., rhinoplasty.