FORDS ARE A poc
ours was making a teerrible knocking noise like it was low on oil. also the check engine light was stuck on. had a shop replace some gaskets (upper manifold maybe?) and noise is gone.
i think the "swishing noise" you mean is casued by the belts turning on the puleys , you can check this by squirting a little wd40 on the belts as its running and the noise should go away for a short time .
it´s possible that a bad hydraulic lifter is working dry.
Get a new one.
its your engine control module>>>JAC
Bad ignition coil
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.
The most common cause of the whistling in a 2003 Impala is a vacuum leak. Any of the lines under the hood could be causing the noise.
supercharger coupler / bearings
check the upper intake manifold gasket,may have a vacuum leak at high operating temps.
What type and weight of oil are you using in your engine, and how many miles are on it?
i have heard that noise and I believe it is coming from the body frame connection and i also heard that u can get a kit to eliminate the noise. Ed