I own a 1990 Acura Legend Coupe and would like to replace the PCV valve, but can not find where it is located. I have worked on most all the cars I have owned, but locating this part has me stumped. The Haynes book only appears to give the PCV valve a fleeting mention. Can anyone tell me where this thing is located? Any tips on replacing it would be greatly appreciated if it is internal to the intake manifold instead of externally connected by vacuum tube (like my other cars were)?