Why do many Changan Kalam owners in Pakistan report excessive black smoke from the exhaust, especially during acceleration?

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Why do many Changan Kalam owners in Pakistan report excessive black smoke from the exhaust, especially during acceleration?

Users have raised concerns about visible emissions affecting air quality. Is this caused by poor engine tuning o r low-quality fuel compatibility?

Lubaba asked on 18 Jun 2025 17:37:54 pm

1 Answer

12 views |

Car Mechanic Expert - on 18 Jun 2025 17:44:36 pm

✅ Yes — black smoke is a common issue, especially under load o r acceleration.

Likely causes:

Poor air-fuel ratio too rich due to faulty injectors o r clogged air filters

Inadequate engine tuning for local fuel quality

Absence o r failure of emission control components

This results in incomplete combustion, releasing unburnt carbon particles soot.

🛑 Conclusion: Black smoke indicates inefficient combustion, worsened by poor engine calibration o r lack of after-treatment systems.