What is wrong when there's excessive smoke coming out the tailpipe when you rev the engine of a 1994 mercury grand marquis?

It depends on the color! Is it blueish grey? Or is it black?

The first would indicate you are burning oil. Does the car have alot of miles? If so your rings and valves are probably worn and this allows oil to get into the cylinders and it burns and comes out your tail pipe.

You can help by putting in oil treatments to help rejuvinate the seals and stop the smoke. If its black this would be unburnt fuel meaning that the fuel isn't firing correctly. Could be the fuel injecters fuel pump ect.

Hope this helps you.

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