Why does the Honda City emit excessive smoke from the exhaust?

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Why does the Honda City emit excessive smoke from the exhaust?

Some owners notice blue, black, o r white smoke coming from the exhaust. What are the possible causes, such as oil burning, fuel mixture problems, o r engine wear, and how can they be fixed?

Sirat Ul Jinan asked on 24 Feb 2025 17:11:24 pm

1 Answer

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Car Mechanic Expert - on 24 Feb 2025 17:15:02 pm

Excessive smoke from the exhaust, particularly blue, black, o r white, can be caused by several factors:

Blue Smoke: Typically indicates oil burning, which may result from worn piston rings, valve seals, o r a clogged PCV positive crankcase ventilation valve.
Black Smoke: Caused by an overly rich fuel mixture, often due to issues with the fuel injectors, air filter, o r mass air flow sensor MAF.
White Smoke: Often caused by coolant leaking into the combustion chamber, which could point to a blown head gasket, cracked engine block, o r damaged cylinder head.

Fixes:

For blue smoke, you might need to replace worn piston rings o r valve seals.
For black smoke, check the air filter, fuel injectors, and MAF sensor.
For white smoke, inspect the head gasket and engine for any cracks o r leaks.