Quick Answer. A bad mass air flow sensor in a vehicle makes starting difficult and affects the performance of the engine because he engine-control unit uses data from the MAF sensor to balance the fuel ratio the injectors deliver to the engine.
While porcelain tile boasts exceptional durability, there are few products and techniques you should take pains to avoid: 1  Never use a product containing ammonia or bleach (or any type of acid-based cleanser); these can alter the tile color and/or stain the grout. 2  Never use oil-based detergents or wax cleaners.
The top color of the tile is all the way through the tile. So a travertine colored tile will have a tan colored edge after you cut it. Same with a grey slate colored one or a white one. These are possible with porcelain tile because the clay used in them is more refined and actually holds the color that's added to it. Porcelain tiles can be glazed also. Porcelain is a stronger tile, and usually more expensive. It is a big outfit but they do not distribute retail all by themselves. Not sure why you feel Chicago is anything special-there are only 9-10 company owned DalTile selection centers in country and there are not 2 in any city.