it might be an oil spill/leak somewhere near your exhaust manifold.

it could also be a seized brake caliper. (smells like burnt coffee). after driving your car walk around it and using the back of your hand feel the temprature comming off all of your weels. if its the same then its probobly not your problem. if one of the wheels feels alot hotter then the other 3 its probobly a seized brake caliper.