924Board.org

[Tiny]

With a timing light, I've set the timing to factory spec, and i seem to be having similar symptoms to

http://www.924board.org/viewtopic.php?t=23030 (titled "fuel pressure issue 924")

After a minute of running from a cold engine, engine revs gradually drop till car stalls. (its an auto)

Can restart no problem. This happens until the engine is at running temp, regardless of where the ign. timing and fuel mix are set. (also just to say, I know these are set correctly at the moment.)

Once at running temp, everything is fine - runs smooth and Im able to set timing and reset idle speed with no probs.

Have replaced all suspect vacuum hoses,intake boots, replaced the AAV too.

Other board members have mentioned the WUR. I want to know if anyone here has successfully opened/cleaned/rebuilt their WUR as Mike924 says the metal valve can jet jammed. Any major pitfalls when undertaking this job?

I dont want to be taking it apart to find out that putting back together is going to be as tricky as rebuilding the fuel distributor.

Thanks All

Tiny
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*****1981 - 924 - Auto - London, UK******

[Ozzie]

Try disconnecting the wires to the WUR and allowing it to warm up from the engine heat only.
Same for the AAV.
See if this makes a difference.
Also an auto should be set to idle speed while in drive.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[Rasta Monsta]

Special T Auto. . .
_________________
Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[Mike924]

It's easy enough to open up the WUR; there's just a screw in each corner. As the screws are Loctite'd, you need to apply quite a bit of force, so careful application with a well-fitting tool is required.

Once inside, things come out quite easily. There's an electircally-assisted bi-metallic strip and a simple 'plug'-type valve. On mine, the plug was rusted to the body (a ~1-inch steel insert in the die-cast case).

I'm sure if the rust was cleaned off, the thing would work fine. The trouble is that the parts are very small, so I'm not sure just how easing cleaning the rust off would be. I have to admit that when I took mine apart, I dropped the plug and I've never seen it since!

On a scale of 1 to 10 (fuel dist. = 10), I'd say 6.
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

[Mike924]

Of course, the other option is to replace. WURs come up pretty regularly on a 'certain well-known aution site', but as this seems to be a common failure mode of WURs (at least in our damp climate ), quality can be iffy (especially if the car it's from has been sitting for any length of time.)

I bought one new from Euro Car Parts (£120 including the dreaded), but I see the 924 ones aren't listed anymore. You'd have to risk a Golf GTi unit...
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

[Mike924]

Oh - and, before opening the WUR up, check the resistance of the heating element. It should be around 100 ohms iirc, but if it's open circuit, the element's gone. You could attempt to repair a broken element (I know Smoothie would, just for the hell of it ), but on the same 1 - 10 scale, that would be a 15!
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

[Benino]

[Buwani 931]

I ran across this a while back. Mine is a bit different but this has the basics of it

http://www.bmw320i.com/library/howto/WUR%20Servicing.pdf

I think the hardest part in the mounting and unmounting to the block. I did find a allen wrench that I had been missing while I was down there.

Shawn
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1980 931
That's thirty minutes away. I'll be there in ten.

[Tigger937]

Excellent!!!
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1981 931 (Concours)
1982 931 (Daily Driver)

"Think outside the box"

[Tiny]

Hi Guys - thanks for posting that "How to" - very cool

Just removed and opened mine to find this mess... -

so question....Whats in my WUR?!?





Tiny
_________________
*****1981 - 924 - Auto - London, UK******

[968rz]

[Rasta Monsta]

I'll see that water and raise you a pile of rust.
_________________
Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[968rz]

High stakes playa eh? question is how would water get there; time for some fuel conditioner like Heat (to remove water from gas)
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Rick
79 924 coupe Petrol Blue 3spd auto (wife's DD)
93 968 coupe Amazon Green 4spd Tip (my DD)

[Smoothie]

I'd have said condensation if it were an even distribution all over, but the white stuff coming up just to a certain level like that has me thinking it was leaking fuel internally.
_________________
"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

[Mike924]

Fuel can't build up inside, because the bottom plate has a hole in the middle.

I'm pretty sure condensation is the culprit.
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org