Ford 1998 Windstar Owner's Manual page 307

Do not park, idle, or drive your vehicle in dry grass or
other dry ground cover. The emission system heats up
the engine compartment and exhaust system, which can
start a fire.
Do not remove the floor carpet in your vehicle. Emission
controls cause high exhaust temperatures under the floor.
Exhaust leaks may result in the entry of harmful and
potentially lethal fumes into the passenger compartment.
Under extreme conditions excessive exhaust temperatures
could damage the fuel system, the interior floor covering,
or other vehicle components, possibly causing a fire.
Watch for fluid leaks, strange odors, smoke and loss of oil
pressure. Also watch for the charge warning light, the check
engine light, or the temperature warning light. These sometimes
indicate that the emission system is not working properly.
Do not make any unauthorized changes to your vehicle or
engine. Changes that cause more unburned fuel to reach the
exhaust system can increase the temperature of the engine or
exhaust system.
By law, anyone who manufactures, repairs, services, sells, leases
vehicles, trades vehicles, or supervises a fleet of vehicles is not
permitted to intentionally remove an emission control device or
prevent it from working. In some of the United States and in
Canada, vehicle owners may be liable if their emission control
device is removed or is prevented from working.
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