Engine Ticking? Hear It With a Stethoscope, Then See It With a Borescope
Key facts
- Some ticking is normal. Direct-injection injectors and some fuel pumps make a steady tick.
- Use the stethoscope with the engine running, and keep hands, hair, sleeves and the probe away from belts and fans.
- Use the borescope only with the engine off and cool. Never insert it near moving parts.
- ROVE manuals prohibit inserting the probe into exhaust components. Look at manifold joints and heat shields from outside.
A new tick is the kind of noise that keeps you up at night. Most are harmless or cheap to fix, and two inexpensive tools tell you which kind you have.
Step 1: Find it by ear
Touch the stethoscope probe to non-moving parts: valve covers, injectors, manifold bolts and accessory brackets. The tick gets clearly louder near its source. Note the spot, then shut the engine off and let it cool.
Step 2: Look at it
| Where it's loudest | Likely sources | Where the borescope looks (engine off, cold) |
|---|---|---|
| Top of the valve cover | Valvetrain: lifters, rockers, cam wear | Through the oil filler opening at cam lobes and rockers |
| At each injector, evenly | Normal injector operation | No need; a steady, even tick at every injector is usually normal |
| Near the exhaust manifold | Exhaust leak at a cracked manifold or blown gasket | The outside of the manifold-to-head joint for black soot trails |
| Under the car, metallic | Loose heat shield touching a pipe | Behind the shields for a broken clamp or rub marks |
| One cylinder area, sharp | Loose spark plug or coil | Remove the coil and look at the plug seat and threads |
| Front of the engine | Pulley or tensioner bearing | Behind the belt path for wobble marks or dust from a failing bearing |
When to stop driving
A deep knock that rises with engine speed, a tick that suddenly gets much louder, or one that comes with low oil pressure warnings all need a mechanic before more driving. Check the oil level first; low oil is a common cause of valvetrain noise.
Frequently asked questions
Is engine ticking normal?
Some is. Direct-injection injectors tick evenly as they fire. A new, louder or uneven tick is worth checking.
How do I use a mechanic's stethoscope safely?
Keep the engine at idle, touch only stationary parts, and stay well clear of belts, pulleys and the cooling fan. Tie back loose clothing and hair.
Can a borescope see lifters?
Sometimes. Through the oil filler you can often see cam lobes and rockers. Lifters may be hidden below them.
How do I check for an exhaust manifold leak?
Listen for a tick that's loudest on a cold start and near the manifold. With the engine cold, look along the outside of the manifold joints for black soot trails. Don't insert the probe into the exhaust.
Can low oil cause ticking?
Yes. Check the oil level and condition first. It's the cheapest fix there is.
Should I record the noise?
Yes. A phone video with sound, plus borescope photos, helps a mechanic diagnose it quickly.
Which ROVE fits this? Looking through an oil filler at cam lobes, or behind a heat shield, means aiming the tip around corners. The ROVE RS4 and its 360° joystick are built for that. The ROVE RS2 handles straight looks, such as a coil well or a plug seat.
Pairing tools like this is how good shops diagnose. See the auto shop equipment list.
About ROVE: ROVE is a U.S. brand headquartered in Orlando, Florida, and the team behind ROVE dash cams. Its borescope line includes the RS2 (two-way articulation) and the RS4 (four-way, 360° articulation): standalone 1080P inspection cameras with a 6.2mm IP67 probe, 1.6m reach and a built-in 4.3-inch screen, backed by a one-year warranty.
Hear the Tick. Find the Cause.
Inspect hard-to-reach engine components and get a closer look at potential problems with a ROVE articulating borescope.
