The smell from the engine is usually distinct from the other type of smell found in the car like; spilled coffee, food, air conditioner, and many others that leave a scent in the car. However, it is advisable to investigate an odd odor emanating from the engine because it could be a sign of engine repairs resulting in motor-vehicle failure. Whenever you encounter a strange smell, you should take it upon yourself to check it out or consult a professional since different smells indicate different engine issues.