Noises
Why is my engine making a knocking or ticking noise?
A knock or tick from your engine is one of the more worrying noises a car can make, because the engine is expensive to repair. But not every knock means disaster — some causes are simple and cheap to fix if you catch them early.
Quick Answer
Engine knocking is often caused by low or dirty oil, using a lower fuel octane than your engine requires, or carbon buildup causing pre-ignition. A deeper, rhythmic knock that speeds up with the engine can signal worn rod bearings — a serious problem. Get it diagnosed quickly to avoid major engine damage.
Safety First
A loud, rhythmic knock that gets faster as you rev the engine can indicate internal damage. Stop driving and have it diagnosed before it leads to catastrophic engine failure.
Most Likely Causes
Listed from most to least likely. Only a proper inspection can confirm the exact cause for your vehicle.
- 1
Low or dirty engine oil
Most likelyInsufficient or worn-out oil reduces lubrication, causing valvetrain components to tick or tap. Often the easiest and cheapest cause to correct.
- 2
Wrong fuel octane / engine knock (pre-ignition)
CommonUsing regular fuel in an engine that needs premium can cause a metallic pinging or knocking under acceleration as the fuel ignites at the wrong time.
- 3
Carbon buildup or a failing component
PossibleCarbon deposits, a worn timing chain tensioner, or a sticking lifter can all create ticking that needs proper diagnosis.
- 4
Worn rod or main bearings
Less common (serious)A deep knock that rises with engine speed can mean worn internal bearings — the most serious cause and a reason to stop driving until it is checked.
How Adam & Son Diagnoses It
Check oil level and condition
We start with the simplest cause — oil level, condition, and pressure — before assuming the worst.
Listen and scan
Our technicians pinpoint where the noise originates and pull any stored trouble codes with advanced diagnostic equipment.
Digital report
You receive a clear, plain-English explanation with photos of what we found and your options — no upsell.
Related Services
The repairs and inspections that address this symptom.
Frequently Asked Questions
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