Allows gasses trapped in the crankcase to expand or contract without blowing out the seals and gaskets in the engine (i.e. valve cover gasket, piston rings, camshaft seals, cylinder head gasket, etc). Typically these gasses are full of oil/fuel vapors and are routed from the PCV valve into the intake to be burned in combustion. That's why people complain that they have an oil residue in their intake system (DV, IC, hoses, etc).
Is the PCV valve ("the black puck") supposed to be able to keep some kind of pressure??? I pulled the PCV out and I could blow through it without any resistance in both directions (after emtying it from a spoonful of oil). Is it normal that there is no restriction of flow???
I'm confused because it will always allow extra air into the system past the MAF, so I'd imagine that at least there should be a pressure requirement.
I own a an AEB (1998) and have removed and "flushed" out the "black puck". Is there any mechanical action inside this part? When you look inside it there seems to be a metal spring...why would there be a spring in it if it is just supposed to collect goo?
The car will run perfectly without this valve, it's circulating the air/gas only for environmental reasons. When I was hunting for a leak in I disconnected the valve and plugged the hole in the intake, just to rule out a leak there. No probs. But I guess no performance to gain...even if the gasses circulated are hot and might in theory reduce the performance of the turbo...
I have a guy give me a 1999 Volkswagen Passat and he told me he wasn't sure what was wrong with it but it was free so I took it.
It starts, runs for a second and then stalls out. Sometimes it runs for a few minutes. Most of the time it dies shortly after I start it... Within 3 seconds or so...
I've seen this on many forums and it's always been a winner. Post up what you did to your car today. Add a picture or two that show what your did.
With that, I give you my addition, I polished my headlights.