Would the ignition coil in a 1997 cavalier be reason car is so noisy?

An ignition coil problem is unlikely to be the *primary* reason a 1997 Cavalier is excessively noisy. While a failing coil can cause misfires which might *contribute* to a slightly rougher running engine (and thus a slightly louder sound), it wouldn't typically make the car dramatically noisier.

A significantly louder-than-normal car points towards other mechanical issues, such as:

* Exhaust system leaks: This is a very common cause of increased noise. A hole in the exhaust pipe or muffler will create a roaring or rattling sound.

* Engine mounts: Worn engine mounts allow the engine to move excessively, leading to knocking and vibration sounds.

* Transmission problems: Issues with the transmission can cause various noises, depending on the specific problem.

* Wheel bearings: Worn wheel bearings often produce a humming or growling noise that increases with speed.

* Suspension components: Worn shocks, struts, bushings, or ball joints can all contribute to increased noise and vibration.

To diagnose the noise, you'll need to pinpoint where it's coming from and when it occurs (e.g., only at idle, only when accelerating, only at higher speeds, etc.). A mechanic can help identify the source much more quickly and accurately. While a failing ignition coil *could* be a contributing factor to *some* additional noise, it's unlikely to be the root cause of a suddenly much noisier vehicle.