Exhaust Odor Inside Car Leak in exhaust pipe under passenger compartment. Keep windows open and turn the fan on high in the fresh-air position. These toxic fumes are extremely dangerous. Keep windows open and turn the fan on high in the fresh-air position. Avoid open flames.
Peculiar noises are often an early warning sign.
Listen to them closely and you may avoid costly repairs. Check your Owner's Manual for recommended octane level. Heavy knocking could indicate a bad connecting rod or worn crankshaft main bearing. Worn brake pads or other brake problems. When the engine is cold, look and feel for bulges, cracks, soft spots or brittleness.