Quick answer
Engine Knocking Sound: the most common causes are rod bearing wear — low oil or wrong oil grade causing deep rhythmic knock, pre-ignition / spark knock from low-octane fuel or carbon deposits in combustion chamber, piston slap from worn cylinder bores. Metre Per Second (KPHB, Hyderabad) diagnoses the exact fault and repairs it same-day — typical work runs ₹1,000 – ₹2,500, with free pickup and drop across Hyderabad, OEM-grade parts and a 1-year warranty. Call +91 8555824915.
What causes Engine Knocking Sound?
These are the faults we most often find behind this symptom on cars driven in Hyderabad's heat and stop-go traffic:
- Rod bearing wear — low oil or wrong oil grade causing deep rhythmic knock
- Pre-ignition / spark knock from low-octane fuel or carbon deposits in combustion chamber
- Piston slap from worn cylinder bores (pronounced when cold, less when hot)
- Hydraulic valve lifter noise from low oil pressure
- Timing chain stretch causing detonation from incorrect ignition timing
Repairs & indicative pricing (INR)
| Repair | Indicative price |
|---|---|
| Engine knock diagnosis | ₹1,000 – ₹2,500 |
| Oil change with correct grade | ₹2,500 – ₹5,000 |
| Carbon cleaning (walnut blast) | ₹5,000 – ₹10,000 |
| Timing chain inspection | ₹2,000 – ₹5,000 |
| Engine internals inspection | ₹5,000 – ₹15,000 |
Final price depends on diagnosis. We share a written estimate before any work — no surprises. Free pickup & drop across Hyderabad, OEM-grade parts and a 1-year warranty.
Frequently asked questions
Is engine knocking sound serious? Can I still drive?
Engine knocking is always serious and should not be ignored. Deep, rhythmic knocking (especially at idle or low RPM) is rod bearing knock — continuing to drive causes catastrophic engine failure within hours to days. Lighter, high-pitched pinging under acceleration is spark knock — less immediately dangerous but causes long-term damage. Bring your car to Metre Per Second immediately for diagnosis. We offer free emergency assessment for knock concerns.
What causes engine knock in Hyderabad cars?
In Hyderabad, the most common knock causes are: 1) Low-octane petrol from some fuel stations causing detonation (use only Shell V-Power or HP Power), 2) Extended oil change intervals in hot weather degrading oil lubrication, 3) Wrong oil viscosity grade (using 20W-50 in modern engines requiring 0W-20), 4) Carbon deposits in combustion chamber causing hot spots.
Related car problems we fix in Hyderabad
Why Hyderabad drivers choose Metre Per Second
- Factory-grade diagnostics — we read the real fault, not just a generic code.
- Free pickup & drop across all of Hyderabad — KPHB, Kukatpally, Miyapur, Hitech City, Gachibowli, Banjara Hills, Secunderabad and more.
- 1-year unconditional warranty on parts and labour.
- Transparent, written estimates — typically 30–50% below authorised dealers.