DIY: Moderate
Engine Ticking Noise: What Causes It and When to Worry
Not every tick is a problem. Some come from normal parts like fuel injectors, and others point to low oil or worn parts inside the engine. When it happens, and whether it fades as the engine warms, tells you which is which.
Stay safe first
- If the ticking comes with the oil warning light, or turns into a heavy knocking that gets louder, shut the engine off. Running with no oil pressure can destroy an engine.
- Check the oil level before anything else. It is the cheapest and most important check.
Ticks on a cold start and fades as the engine warms
Likely causes
- Exhaust manifold leak from a loose gasket or a broken manifold bolt
- Cold valvetrain noise that quiets as oil reaches the parts
- Fuel injectors, which tick audibly on many engines and are normal
What to check
- Check the oil level and condition.
- Look at the manifolds for black soot streaks, which point to an exhaust leak.
- A tick that fades completely once warm is less urgent, but mention it to a mechanic.
A tick that follows engine speed and does not go away when warm
Likely causes
- Low or very dirty oil
- Worn valve lifter, rocker arm or camshaft
- Valve adjustment out of range on engines that need it
What to check
- Check the oil level first. Low oil makes valvetrain noise much worse.
- If the oil is overdue, change it with the grade the manual specifies and see if the noise changes.
- If the tick stays, get a shop to find where it is coming from before it gets worse.
Ticking together with a misfire or a check engine light
Likely causes
- A failed lifter that stops opening a valve properly
- Ignition coil or spark plug problem on one cylinder
What to check
- Read the stored codes and note which cylinder is named.
- Swap that cylinder's ignition coil with another cylinder's. If the misfire moves, it is the coil. If it stays, a mechanical cause is more likely.
- A flashing check engine light means stop driving soon, since a misfire can damage the catalytic converter.
A tick that follows vehicle speed, not engine speed
Likely causes
- A stone or nail stuck in a tire tread
- Loose wheel cover or lug nut
- Worn CV joint, which clicks on turns
What to check
- If the tick speeds up as the car speeds up, even in neutral or coasting, it is probably not the engine.
- Look at each tire for something stuck in the tread, and check the wheel covers and lug nuts.
- A click only when turning points to a worn CV joint. Look for torn rubber boots and thrown grease.
Narrow it down for your vehicle
The same symptom can have different likely causes depending on your year, make, model and engine. Describe what you are seeing and CaliperAI will help narrow down the likely causes for your vehicle.
Related guides
General information about this symptom, not a diagnosis of your specific vehicle. Safety-critical work such as brakes, fuel and airbags is best left to a qualified mechanic.