* Exhaust leak. A hole or crack in the exhaust system can cause a growling sound. Check the exhaust system for any damage and have it repaired if necessary.
* Bad oxygen sensor. An oxygen sensor measures the amount of oxygen in the exhaust gas and sends this information to the engine computer. If the oxygen sensor is bad, it can cause the engine to run rich, which can produce a growling sound.
* Faulty fuel injector. A fuel injector sprays fuel into the engine cylinders. If a fuel injector is faulty, it can cause the engine to run lean, which can also produce a growling sound.
* Worn-out engine mounts. Engine mounts hold the engine in place and absorb vibrations. If the engine mounts are worn out, they can cause the engine to vibrate excessively, which can produce a growling sound.
If you are experiencing a growling sound when you push the gas pedal in your 1997 BMW 328i, it is important to have it diagnosed and repaired as soon as possible.
