thanks rozzzz for ur advise.....
i need advice in one more thing by u guys my car is on petrol
and its engine is recently overhauled but my car is giving black
smoke at startup but only on startup.recently i have my car tuned
by a authorized suzuki dealer and he has done a computerized
tuning and he is saying that ur car will give black smoke because
there is too much carbon in the exhaust lines but sometimes it also gives
white smoke when i revive(pump) the car