A bad exhaust manifold gasket could do that.
If it's the intake manifold, the car won't run very well - if at all. The exhaust manifold will make a loud noise and you should be able to smell the fumes under the hood. Also, it will most probably make a snapping and popping noise when you decelerate.
manifold or downpipe gaskets may be leaking gases or worse, cracked manifold
Hey Teisha===If it sounds like the noise is in the engine it can be a loose spark plug or an ex manifold gasket leaking. It really has to be heard to be diagnoised. GoodluckJoe
your manifold bolts are loose
it can cause excessive noise and excessive heat to electrical lines under the hood. It is also a place for CO gases to build up and find a way into the drivers compartment. Yes, a lot. In the exhaust manifold anyway. In the intake manifold it wouldn't run.
have you checked to see if there is any broken bolt on the manifold, or worped manifold, burnt manifold gasket
This noise is caused by the exhaust manifold gasket being perforated adjacent to the flange of the branch of number one cylinder, the noise is being created by high pressure/back pressure in the exhaust manifold escaping betyween the exhaust manifold and the cylindert head- Owen Diesel
A leaking manifold seal on the intake will cause a popping noise on the 1996 Honda Accord. This can heard most clearly on days when the weather is cold because the seals tend to shrink.
They make noise by making it.
whistling noise from engine will be caused by a leaky gasket,sucking air. this is usually the intake manifold gasket
you are forbidden to make a noise