# Why doe the gas furnace blow black smoke?
A for sale sign, then buy a diesel.
Poor a pint of oil in the gas tank that will get her smokin! :)
Black smoke is ALWAYS too much gas going through the engine. They get bad gas mileage. See a mechanic.
yes but if it is black it is burning gas
If you have black smoke coming out it would be because you have bad timings, i have a buddy who had that happen to his jeep and we replaced the spark plugs and air filter and fixed the timing and it solved the problem, but wen you blow black smoke its because of bad timing it happens with diesels to.
excessive or unburnt fuel.
blue smoke=oil in the combustion chamber(i.e. valve seals etc) white smoke=coolant in the combustion chamber(head gasket etc) black smoke=gas in the combustion chamber(leaky valve etc)
Black smoke is always too much gas. Its running too rich. Poor mpg! A good mechanic can scan it in a minute. Might be an O2 sensor failure causing 'open loop' all the time.
it smokes on hills problably because your giving it gas if it is black smoke
Generally speaking, white smoke is steam and generally does not pollute at all, whereas black smoke is pure burned ash that has been turned into a gas.
Actually it is getting too much gas. Black smoke is an indication of an overly rich fuel mixture.