89BuickRegalGS Posted March 6, 2003 Report Share Posted March 6, 2003 what does a PCV valve do? how often should it be replaced? just wondering, thanks Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted March 6, 2003 Report Share Posted March 6, 2003 A Positive Crankcase Ventilation (PCV) valve recirculates gases from the valve covers and extra pressure in the head through the intake manifold to be reburned... it's mainly for emissions. As for replacing it, about every 30K miles or if you can check it often, whenever carbon / oil build up is found. They really don't go bad, they just need to be cleaned using some solvent from a arasol can (brake / throttle body cleaner). - RedFox340 Quote Link to comment Share on other sites More sharing options...
89BuickRegalGS Posted March 7, 2003 Author Report Share Posted March 7, 2003 thanks for the response. whenever i bought a used car, my dad would change out the PCV valve on it. what are the symptons of a bad one? does it screw up the engine? Quote Link to comment Share on other sites More sharing options...
GrandPrix34 Posted March 7, 2003 Report Share Posted March 7, 2003 i got a little filter on the back of the plenum were the tube that connected to the intake goes...wanted to know if this a prob and if this could affect th PCV system? also, wat if i ran cold air induction by placing the breather in a clooler place, would this be any effectivef? Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted March 7, 2003 Report Share Posted March 7, 2003 It's not that big of deal, mainly when you let of the gas, pressure within the engine is recirculated; a clogged one can stall the car but it won't wreck anything... more of a pain for you. When you car doesn't pass emissions (in states where it's required) usually you change that along with some basic tune up items like O2 sensor, plugs, and other little things. - RedFox340 Quote Link to comment Share on other sites More sharing options...
SmokesGTP Posted March 7, 2003 Report Share Posted March 7, 2003 I have already posted about this and its really bothering me. I went to the library and was browsing through the chiltons and haynes and I came across a haynes for a 1995-2001 Montes, Luminas, And Impalas. It went through everything in detail except for one little section on the 3.4 DOHC and it told nothing of the PCV valve. Nothing on Plugs and Wires or any tune-up stuff. I wanted to replace my PCV but I have no idea where it is? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted March 8, 2003 Report Share Posted March 8, 2003 Smokes, it is located in the intake manifold just behind the throttle body assembly. Quote Link to comment Share on other sites More sharing options...
SmokesGTP Posted March 9, 2003 Report Share Posted March 9, 2003 Thanks Quote Link to comment Share on other sites More sharing options...
88Intl Posted March 9, 2003 Report Share Posted March 9, 2003 Combustion gases that blow by the rings have to go somewhere. If the crankcase was sealed, the pressure would blow out seals and there would be oil leaks. Up until the 1960s, a "draft tube" from the crankcase to down near the road would use the breeze under the car to suck the gases out of the crankcase. A breather would let fresh air into the crankcase. Small engines like lawn mowers, still use this system today. To reduce emissions and oil drips, PCV systems were developed for automotive engines, to re-burn crankcase gases. When starting and idling, the PCV valve restricts crankcase gas flow to the intake. A clogged PCV valve can result in oil leaks, oil in the air cleaner, and sludge buildup in the engine. Leaks in the hose are vacuum leaks and cause idle and running problems. Quad-4 motors use an oil/air separator that returns oil to the crankcase and gases to the intake. Quote Link to comment Share on other sites More sharing options...
lukee1982 Posted March 10, 2003 Report Share Posted March 10, 2003 I am having a problem with my pcv comming off when I start my car making a backfire and the pcv is only a month old it did this with the previous pcv Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted March 11, 2003 Report Share Posted March 11, 2003 I am having a problem with my pcv comming off when I start my car making a backfire and the pcv is only a month old it did this with the previous pcv Is it on backwards? A PCV only lets flow of one direction happen. Perhaps an easy fix... ya'? - RedFox340 Quote Link to comment Share on other sites More sharing options...
lukee1982 Posted March 17, 2003 Report Share Posted March 17, 2003 i tried turning it around and found that the hose is only long enough to hook it up the way it is also having another possibly related problem http://www.w-body.com/forum/viewtopic.php?t=2105&highlight=secondary+air Quote Link to comment Share on other sites More sharing options...
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