Why do some Changan Karvaan units in Pakistan emit excessive black o r white smoke during acceleration o r cold starts?

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Why do some Changan Karvaan units in Pakistan emit excessive black o r white smoke during acceleration o r cold starts?

Drivers report visible exhaust smoke in cities like Lahore and Karachi. Is poor combustion, dirty injectors, o r engine wear responsible for increased emissions?

Sandeep asked on 26 Jun 2025 15:56:26 pm

1 Answer

7 views |

Car Mechanic Expert - on 26 Jun 2025 16:06:37 pm

Yes, excessive black smoke unburnt fuel and white smoke coolant/oil vapor are common complaints. Causes include:

Poor fuel combustion due to dirty injectors, worn spark plugs, o r improper air-fuel mix.

Engine wear, especially in older models, leading to oil leaks into combustion chambers.

Cold starts exaggerate the issue due to incomplete combustion before the engine warms up.

⛔ Conclusion: Smoke during acceleration o r cold starts signals fuel delivery o r engine health issues, often linked to poor maintenance o r engine wear.