924Board.org

[jacobscott209]

Ok, I've been having cold starting problems. In an effort to fix it I checked out the wur a little.

Has power and ground with key on.

I took off the fuel lines running to it and tried to blow through them. key on and key off. But nothing. Rock solid.

From what I've read so far I was under the impression I should be able to blow through it with the key on.

My car sat for 16 years untouched before I got it and pretty much every fuel part was full of varnish or degraded injectors, cold start valve, filter, pump and fuel lines.

I'm pretty sure I have the same situation with the WUR. but I wanted to run it by some of the pros before taking any more action with it.

If this sounds like it could be valid, is there any way to rebuild/clean it or am I screwed into buying a new one?
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77924

[924RACR]

You need to use the pressure gauge setup to test the WUR.

Maybe you're confused with the aux air valve?
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[jacobscott209]

naw, I know what the wur is. I just don't know anything about it.... I've had a lot of varnished fuel part problems. I just want to know if this thing could be another. If so how do I test it.
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77924

[Ozzie]

you wont be able to blow through it.
it is used to reduce control pressure but it still is high and lungs arent strong enough.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[ptheskil]

jacobscott209, I don't know if you are still having problems with your WUR but I just spent the weekend fixing problems with the WUR on mine and my experiences might be some help...

With my original WUR fitted I had system pressure (6.0 bar - it's a ROW turbo) in the control pressure line. I got hold of a used replacement which dropped the control pressure to 4.0bar cold (should have been about 1.5bar though for the sub zero temperature I was working in).

I stripped my original one down, cleaned the internals, carefully reassembled it and it was still at 6.0bar control pressure. I had cleaned everything thoroughly and kept dirt well away so I was pretty sure that it should work. Then I read here that sometimes the inlet mesh filter on the WUR clogs up so I soaked mine overnight in acetone and blew it through. Then I got just under 6.0bar. In desperation I carefully prised out the mesh filter and after that everything was back to factory spec or a touch lower. I decided to clean up the mesh filter which is made of 5 separate layers of mesh and the ones in the middle are incredibly fine. There was a load of muck trapped between the two fine filters which I managed to clean off. I pressed each mesh flat and pressed them back into the inlet. They seem to hold in there OK. Back on the car and all is well. Cold start at the turn of the key and engine runs up to warm very smoothly.

It's definitely worth rebuilding your WUR before you fork out for a new/reconditioned one. You will need a CIS pressure tester though - you can't do this job and know you have done it properly without one. Also I plumbed in the WUR off the engine using the CIS tester and an extra hose for initial testing. You don't want to be taking it on and off the back of the manifold more than you have to. Don't rely on the fact that air blows through the WUR. Mine blew through fine with just a little air pressure but hardly flowed fuel at all. Hope this helps.

All I need now is a skin graft.
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1981 931 series2 Euro spec

[Rasta Monsta]