help: can somebody tell what is this??

[sblake01]

It is normal to get vacuum when you remove the oil cap. That is because the PCV system creates a sealed crancase. When you remove the cap, you break the seal. As far as idling faster and dying below 1000 rpm, sounds like you have some sort of vacuum leak. Are you sure that the PCV valve you installed is good? You say it 'sucks air strongly' but does it hold when you put air through it in the other direction?

[BuDavid]

i guess yes, i took it out, cleaned it with WD-40 and shaked it, the small vlve inside was free, no tucking at all, and i cn feel that it colides with a spring inside while shaking, in my opinion it sholud be ok, even i blew in it in oposit direction and it was holding my breath, but is there a chance that the air direction will lo from the intake to the crank!?coz i had a real strong vacum pressure on the nd of the vlve while it waas open!, but what about the flame arrester? i didnt find one and i put something just like the PCV valve but smalled in the hose of the valve cover, should i remove it?

i'll try to look for any vacume leak, i think there will be much of it, (old hoses)!

thanks stephen, and by the way, from where u got thescript u atached?

[sblake01]

The picture came from the 1978 280Z owners manual. I think the flame arrester is just the name of that pipe that is on the valve cover. There is nothing in the end of it or the hose that connects to in on either of my cars.