Cars & Vehicles
Emissions and Exhaust Systems
Nissan 240SX

What could be the problem when some heavy light colored smoke is seen after driving a car on a highway stopping and starting it again?


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Wiki User
2005-02-06 15:33:15
2005-02-06 15:33:15

Usualy this is caused by condesation forming in the exhaust system.When the car is driven for a long period and or at highway speeds the exhaust system heats up. Then when it is shut down moisture from the ambient air condenses/collects inside the exhaust,then when you drive the car again the moisture exits the exhaust as steam or even as water dripping from the end of the tailpipe.This is mutch easier to see on a cold day. B


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They "reset" while driving at highway speeds.They "reset" while driving at highway speeds.

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Hi; 2 hours is quit a long time if your driving on the highway, It could lead t0 other damage to the transfer case. If in town driving and you are starting and stopping a lot, It may not seem as bad but remember to take out of gear before stopping at night so it don't freeze in gear. Use it when needed, and it will lead to fewer problems in the long run

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