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Weird CIS behaviour

In message <3517F4C3.1EF@lmco.com> Russ Southerlin writes:

> >Has anyone ever seen 'intermittent leakdown' before?  Any ideas?
> Correct me if I am wrong but I think there are only 3 ways you can get
> leak down on residual pressure.

> 1)FP check valve.


> 2)OXS F/V.

No OXS, but I've got the frequency valve.  The diagnostics don't fire it 
and I replaced it with a known (old) good one.

> 3)The system pressure reg. could cause leak down. The spool piece inside
> the bore could be getting stuck or the O-ring on the end of it may not
> be sealing well. You might also want to check the reg. internals for
> dirt, crud and o-ring condition.

It's new(ish).  Doesn't mean it's not bad, though - it's the only thing I 
haven't changed since I've had the problem.  

> There is also the fuel press. accumulator. I suppose if it was not
> holding any volumn of fuel you might get an intermittent leakdown.  When
> you open the fuel system do you get a fairly large volumn of fuel?

No more than a fluid ounce or so.

It's coming to look like the accumulator, isn't it?  Anyone had one go bad?

 Phil Payne
 UK Audi [ur-]quattro Owners Club