Has anybody experienced a strong odor coming from the engine compartment. My brother has an '04 F250 6.0. About a week ago he started having problems with the egr.(the truck has a little over 100k on it)The same time the egr started acting up we noticed a weird smell. It is only noticable at idle, when you start moving it seems to go away. He just had the egr replaced but the smell is still there. Its not a fuel smell, it almost smells like something burning or some kind of chemical or pesticide. We've looked all over and cant figure out what it is. Any ideas.