i did a search and couldnt get a definite answer as to whether i need this or just should have it. doward called it a PCV actuation valve or something. what im curious about is do i have to have it if i pull the rest of the PCV system and use filters on the valve covers? i am working on a new intake manifold and it would make life a lot easier if i didnt have to use that valve w/ all the vacuum lines running all over.

 

I would say yes as my system is now a fresh air one. Been that way for several years now. Instead of the PVC system dumping into the engine. Its vents into fresh air with a filter.

 

yes i have to have it you mean? or do you think i can get rid of it all, including the valve?

 

Gumby is coreect. You can just *not federally legal* vent the crankcase into the air and completely remove the PCV. The thick line running to the crankcase and valve cover can be removed but I believe if I recall without looking that there is one more medium size hose also (2 large and one medium above crakcase exit) that runs up to the charcol canister. That canister is alsoattached by a small vacuum hose coming directly from the TB as well as the large hose coming off the TB towards the crankcase vent.

You have a lot of routing and plugging to do to make sure nothing is leaking in a round about way when one route is removed.

 

cool, i just wanted to make sure i didnt need that valve for anything other than the pcv system. i was reading a post earlier and, i forget his name, but one guy was saying it was causing his back firing or something. although doward was not agreeing w/ that one though.

 

If your car is a MAF system and you just vent the valve covers, you'll get a check engine light with a MAF code.

The decel valve opens up when you have HIGH vacuum to allow more air into the motor and lean it out. It's an emissions thing to keep CO down during decel.

The theory goes that if you are at WOT and the pulse width is wide open, then you slam the throttle shut to shift, during that split second, you're SUPER rich, which could cause fouling and other problems, so they bleed a little air in there when the throttle closes in order to lean it out.

 

ah ha. so i guess ill be keeping it, thanks