weird smell from exhaust

went to the stor left my 97 windstar running and a weird burnig smell was coming from the exhaust. saw some smoke but it wasnt black or white thought cause it was cold out could this be something serious., this van already has almost 130,000 mile on it and has some other front end problems but i know what i need to do about that but if its an engine problem then im screwed. ant help would be appreciated

Was the smoke blueish?