From Audi 100 to urS4 in a week

[hunker7]

Noone? Like to order a new one asap if possible?

[newsh]

Just had a look at PCV system, and checked the hoses for blockage and checked the valves, the one-way valve that works when engine isn't boosting works fine, but how do I know if the other one is ok?

The small one will probably be leaking, it won't leak if you blow through it with your mouth but it will if you use an air line and try to get it to hold 1 Bar.

The big one should blow through really easy one way and be restricted the other way. The diaphragm can split (easy to blow though both ways) and they can also stick shut (difficult both ways). In any case wash everything out with brake cleaner, all the pipes and valves and poke or pull a coathanger wire through the pipes with a bit of rag wrapped to the end. Replace any rubber bits that have gone soft.

If in doubt replace both valves.

[hunker7]

The small one will probably be leaking, it won't leak if you blow through it with your mouth but it will if you use an air line and try to get it to hold 1 Bar.

The big one should blow through really easy one way and be restricted the other way. The diaphragm can split (easy to blow though both ways) and they can also stick shut (difficult both ways). In any case wash everything out with brake cleaner, all the pipes and valves and poke or pull a coathanger wire through the pipes with a bit of rag wrapped to the end. Replace any rubber bits that have gone soft.

If in doubt replace both valves.

Well, big one needs to be replaced definitely, as I can blow through both ways. Might as well change the smaller one too, for piece of mind, and it's not expensive either.

Thanks for reply.

[hunker7]

How does it affect car's running when those valves are not working up to standard?

[newsh]

How does it affect car's running when those valves are not working up to standard?

The small one will act like a boost leak but inconsistently, sometimes leaking sometimes not. May cause smoking too as pressure can go into crankcase. Big one can cause smoking too, too much vacuum on the crankcase at high RPM.

[hunker7]

The small one will act like a boost leak but inconsistently, sometimes leaking sometimes not. May cause smoking too as pressure can go into crankcase. Big one can cause smoking too, too much vacuum on the crankcase at high RPM.

mm, hopefully this will sort my oil consumption out *fingers crossed*

[hunker7]

Just got a replacement big valve, it is used, but I can still blow through both ends easily?

Nevermind, works fine. Takes some sucking though

[hunker7]

I only get blue smoke when car is cold, once it gets up to temperature no smoke at all?

When engine is up to temperature, dad was following me, I was doing about 70, lifted the thottle for about 5-10 seconds, floored it, and no smoke, that makes me thing the seals are fine?

[hunker7]

There was a bad knock coming from the front suspension. One of the top mounts were shot, and control arm bush was completely gone. So changed both top mounts and the arm bush. It's so much quieter now, will be ordering the rear suspension mount. Got a good deal on front top mount pro kit



Old vs. new control arm bush


While changing front mounts, looked at bumpstops and they are perfect, just need the dust covers.


Also, removed the aircon compressor which will go for a refurbishment before I'm filling it up with gas. My alternator is next up on the list for a refurb, need to order some bushes, otherwise noise is just unbearable.

[hunker7]

What do people think, what's my car worth?

[hunker7]

Swapped a boot lid trim from plastic clip one to metal clip one, and it's so much quieter now.




It comes with sun blind, but I am very sure I won't be using that.

[HMS-S6]

Did you ever get to the bottom of the smoking from cold? Has the car got cats still?

[hunker7]

Did you ever get to the bottom of the smoking from cold? Has the car got cats still?

Smoking was/is worn valve stem seals, and I did open both cats, took a half out from each and welded back up.

[hunker7]

So, as I have decided not to sell my tank I have question. Driving back to Leeds I noticed that temperature dropped to 70 degrees after sitting at around 90? What could be the issue? Thermostat?

[HMS-S6]

Would be the best thing to start with. A good idea anyway IMO if it's never had one!