1. Describe the noise:
* What does it sound like? (e.g., knocking, rattling, grinding, whining, hissing, etc.)
* How loud is it? (e.g., faint, moderate, loud)
* When does it occur? (e.g., at idle, acceleration, deceleration, specific RPM range)
* Is the noise constant or intermittent?
2. Other symptoms:
* Does the engine have any other issues? (e.g., loss of power, rough idle, smoke from the exhaust)
* Have you noticed any changes in fuel consumption or oil consumption?
3. Vehicle information:
* What make and model is your vehicle?
* What year is it?
* What is the mileage?
Once you provide more details, I can give you some potential causes and suggestions for further diagnosis.
Important: It's always best to consult a qualified mechanic for a professional diagnosis and repair.
