where is the PCV valve located

The PCV valve is located behind the alternator, between the alternator and the engine block. You can find a PCV valve repair procedure description at http://www.240sx.org/faq/articles/pcv.htm You can even find one for the 1988 Acura Legend for sale at http://www.autopartsworld.com/1988_acura_legend-2-7-std-4dr_pcv-valve_parts.html

The front top valve cover has 2 pieces (main cover and pcv cover). The PCV is located under the small cover (has a 6 inch hose attached to it) on top of the front valve cover . If you look at the front valve cover, you'll see four (4) bolts. The two outer bolts fasten the valve cover to the cylinder head. The two inner bolts hold the PCV cover to the valve cover. To gain access to the PCV valve, you remove the two inner bolts and remove the PCV cover, leaving the valve cover fastened to the cylinder head. It might take some "persuasion" to get the cover off. Once you have the PCV valve cover off the valve cover, there will be a large square seal (looks like a big o-ring) that seals the perimeter of the PCV cover. There will also be two o-rings that seal the PCV cover bolt bosses to the valve cover. The PCV valve is located on the right side of the opening. You can't miss.

it is located on the front of the valve cover

It should be behind the alternator

It will be in an accessible location close to the block and heads.