Question: Would a nasty valve bring about a smell in the car, like an irritant that burns eyes and nose and this kind of? Throughout a compression take a look at, the mechanic will open up the spark plug, fill the cylinder with oil, get rid of the EFI http://damienwogyq.tinyblogging.com/The-smart-Trick-of-valve-seals-That-Nobody-is-Discussing-35019681