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I removed the PCV valve and some of the breather pipes to clean everything out. The firetrap was a bit manky but cleaned up OK, evrything else wasn't too bad. There was some oily debris in the PCV valve but most of it appears to have flushed out. I was wondering if there was any way of testing the valve to make sure it's working as it should. I have searched but haven't found anything yet. There doesn't seem to be any resistance if you blow through it in either direction - is this normal ?
Thanks in advance.
Were the pcv valve is situated on the engine bay??
Looking from the front it's on the right hand side of the engine block near the back. Here are a couple of photos I found on the forum.
Any one able to help advise if there is any way of testing the PCV valve, or any pointers as to what to look out for which could suggest it should be changed ?
It looks quite clean inside now I've flushed it out but there was a film of oil on the flat circular outer side - does this mean it's probably leaking?
Maybe I should just change it anyway.
Mine looked awful and the investment was well worth it. Very cheap part. The hassle is more to replace it.
Marcel
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current: RS2, + A2 TDI 3L
Favourit: Coupe Quattro Typ 85 or 859. I had one.
If you know someone in Switzerland selling a Ur-20V --> tell me.
Is the valve a blow through type as in open till boost closes it?
You have to be specific about which valve you are talking about in the crankcase ventilation system. There are two: 1) the one-way or "bleeder" (ball valve) and 2) the more complex pressure regulating valve. The one-way/bleeder valve is either working or not (Not = stuck open or stuck close). Remove and shake. No noise? The ball is stuck. Cleaning might make it work again. The pressure regulating valve has a diaphragm inside.
The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
TJ: Can I plug off the PCV under the AAN intake manifold?I have Mann Hummel catch can and draining the motor oil back to the sump .
Pop: TJ reply. You know my answer: IMO, keep all the stock AAN PCV system parts and locate the catch can between the pressure regulating/control valve and point where the system enters the tube going through the cam cover. Others might disagree but I think there were good reasons for the design of the factory PCV system and eliminating it is not a good idea, especially in countries in which the atmosphere is already heavily polluted by vehicle emissions.
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
You have to be specific about which valve you are talking about in the crankcase ventilation system. There are two: 1) the one-way or "bleeder" (ball valve) and 2) the more complex pressure regulating valve. The one-way/bleeder valve is either working or not (Not = stuck open or stuck close). Remove and shake. No noise? The ball is stuck. Cleaning might make it work again. The pressure regulating valve has a diaphragm inside.
The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
Was referring to to PCV valve which is fitted just after the block breather, !
1991 S2 3B Coupe, KW v1, solid sub frames, poly bushed, chipped, about 260 ish
Was referring to to PCV valve which is fitted just after the block breather, !
Ah, you mean the pressure regulating valve (sometimes called the pressure control valve which is unfortunate because the abbreviation PCV gets confused with Positive Crankcase Ventilation = PCV).
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
Should I be able to blow through the pressure regulating valve both ways ?
Flow is only supposed to be going one way but there is a small orifice that is never closed so if you blew through it from either end, there would be some flow. I don't know the source of these two diagrams but they do seem to explain the normal function of the pressure regulating valve under boost and no-boost conditions:
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