Engine Clicking at low MPH

[nhastie]

I have noticed a clicking noise in the engine compartment when the vehicle is going between 14-10 MPH. My guess, it is the tappets but when going at higher speed it disappears. Anyone else have or had this issue?

[RX400h]

Quote

1. Low Oil Level: A common cause of ticking sounds is insufficient oil. Ensure that your engine has the proper oil level and that it’s clean. Contaminated oil or using the wrong viscosity can also contribute to engine noise¹.

2. Hydraulic Lifters: Tappets (also known as hydraulic lifters) could indeed be the culprit. These components maintain proper valve clearance and can make noise if they’re not functioning correctly. If they’re worn or malfunctioning, you might hear clicking sounds².

3. Exhaust Manifold Gasket Leak: A leaking exhaust manifold gasket can create ticking noises. Inspect the gasket for any signs of damage or leaks.

4. Worn Engine Components: Over time, engine parts can wear out. Worn bearings, pulleys, or other components might cause clicking sounds. Pay attention to whether the noise changes with engine speed.

5. Motor Mounts: Damaged or worn motor mounts can lead to engine movement and cause clicking or knocking sounds. These mounts stabilize the engine and absorb vibrations.

6. Valve Train Issues: Improper lubrication of valve train components can result in ticking noises. Make sure your engine oil is at the correct level and of the right type.

Recommendations:

• Inspect the Oil: Check your oil level and quality. If needed, top up or change the oil.
• Professional Inspection: Consider having a mechanic inspect your engine to identify the exact cause of the noise.
• Listen Carefully: Pay attention to when the noise occurs (e.g., during acceleration, idle, or warm-up). This information can help diagnose the issue.