Car engine noises can be alarming and often hint at underlying mechanical issues. Ignoring these sounds could lead to costly repairs or even a breakdown. Understanding the common engine noises and their fixes can save you time, money, and stress. With decades of experience, Grimmer Motors specializes in diagnosing and fixing these issues, ensuring your vehicle runs smoothly.

1. Squealing Noise from the Engine Bay

Inspect and Replace the Serpentine Belt

A high-pitched squealing sound coming from the engine bay is often due to a worn or loose serpentine belt. This belt powers several vital components like the alternator and power steering pump. To fix this, inspect the belt for cracks, fraying, or glazing. If any damage is found, replacing the serpentine belt is crucial. Regular maintenance of this belt ensures that your vehicle’s essential systems function smoothly, preventing breakdowns and costly repairs. For more on maintaining your car, check out this article.

2. Knocking Sound Under the Hood

Check and Refill Engine Oil

A knocking sound from under the hood typically indicates low engine oil levels or poor oil quality. This noise emerges when engine components lack adequate lubrication, leading to increased friction and potential damage. To address this, check the engine oil level using the dipstick and refill or change the oil if necessary. Maintaining proper oil levels not only silences the knocking but also prolongs engine life and enhances performance. For more tips on engine maintenance, visit this page.

3. Clicking or Tapping Noise

Adjust or Replace the Lifters

Clicking or tapping noises often point to issues with the engine’s lifters, which may be worn out or improperly adjusted. Lifters are responsible for opening and closing the engine’s valves, ensuring efficient fuel combustion. To fix this, have a professional mechanic inspect the lifters and perform necessary adjustments or replacements. Properly functioning lifters optimize engine performance and prevent further mechanical issues. Learn more about this and other common issues here.

4. Hissing Sound from the Engine

Inspect the Cooling System for Leaks

A hissing sound typically signals a coolant leak, which can lead to engine overheating. This noise often originates from the radiator, hoses, or the coolant reservoir. To address this, inspect the cooling system for visible leaks, cracks, or loose connections. Repair or replace any damaged components to prevent overheating and potential engine failure. Regular cooling system checks are essential for maintaining optimal engine temperature and preventing severe damage. For more on cooling system maintenance, see this guide.


Recognizing and addressing common engine noises can significantly enhance your vehicle’s performance and longevity. By inspecting and maintaining the serpentine belt, checking engine oil levels, adjusting lifters, and ensuring the cooling system is leak-free, you can prevent costly repairs and enjoy a smoother, safer driving experience. If you’re unsure about any repairs, always consult a professional mechanic to ensure your vehicle remains in top condition.

What engine noise have you noticed recently, and how did you address it? If you’re experiencing any of these issues and need professional help, consider visiting Grimmer Motors. Our team of skilled mechanics offers:

  • Comprehensive engine diagnostics
  • Expert repairs and maintenance
  • Personalized customer service

For more information or to schedule an appointment, visit Grimmer Motors.

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