Quick answer
Car Backfiring: the most common causes are ignition timing retarded too far — unburnt fuel ignites in exhaust, lean mixture causing delayed combustion — common with vacuum leaks, dirty fuel injector causing rich spike followed by lean misfire. Metre Per Second (KPHB, Hyderabad) diagnoses the exact fault and repairs it same-day — typical work runs ₹500 – ₹1,500, with free pickup and drop across Hyderabad, OEM-grade parts and a 1-year warranty. Call +91 8555824915.
What causes Car Backfiring?
These are the faults we most often find behind this symptom on cars driven in Hyderabad's heat and stop-go traffic:
- Ignition timing retarded too far — unburnt fuel ignites in exhaust
- Lean mixture causing delayed combustion — common with vacuum leaks
- Dirty fuel injector causing rich spike followed by lean misfire
- Worn spark plugs causing intermittent misfire and exhaust backfire
- Catalytic converter glowing from unburnt fuel overloading it
Repairs & indicative pricing (INR)
| Repair | Indicative price |
|---|---|
| Ignition timing check | ₹500 – ₹1,500 |
| Spark plug replacement | ₹800 – ₹4,000 |
| Injector cleaning | ₹3,000 – ₹6,000 |
| Vacuum leak smoke test | ₹1,000 – ₹2,500 |
| OBD diagnostic scan | ₹500 |
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
My car makes a popping/backfire sound on deceleration in Hyderabad — is it serious?
Mild popping on deceleration (overrun) is common in performance-tuned or older cars and is usually harmless — it means a small amount of unburnt fuel is igniting in the hot exhaust during engine braking. Loud bangs on deceleration or backfire through the intake are more serious — they can indicate: lean mixture from vacuum leak, sticky injectors, or severe timing issues. Metre Per Second diagnoses backfiring with an OBD scan and fuel trim analysis.
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.