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Autos - Cars > Porsche - 928 > Re: [928uk] PSD...
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Re: [928uk] PSD & odd sound

by 928uk@[EMAIL PROTECTED] Jul 26, 2006 at 09:37 AM

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1.   There's a small black plastic pipe coming off the PSD pump (behind
nearside  rear wheel arch liner) that looks to me like an overflow or
pressure relief  pipe of some kind?  It's only 2-3mm in diameter.  I've
just  noticed it weeping a very small amount of what looks/smells like
brake  fluid.  Any ideas?

2. When the ignition circuit goes live I'm  hearing a small 'clunking'
noise that seems to be from the same nearside  rear corner.  It's an odd
clunk that repeats quickly about 5/6 times  and diminishes - a bit like
the sound of dropped ball that bounces a bit  less each time before
stopping.  Can't pinpoint what it is but it has  a metallic sound to it.



Hi Gareth,
haven't been in there for a few years but iirc there a line to the diff,  
small loom to the unit with multipin connector and a vent from near the
top of  
the reservoir; hopefully your weep is from the vent.
i used to get a lot of clunking from the back when the last speed sensor  
went, i think the control unit sensed that wheel was going and the others 

weren't so locked the diff. Made turning on full lock a bit noisy (tyre
scrub)  too. 
Green light didn't always come on.
Previous sensor went in that mode too but that was rear left so speedo 
often 
ran up to 20 when stationary so that was an easy one!
Worth running a meter across the sensors to find 900+ Ohms across the 
sensor 
and infinite Ohms to earth from both sides. You can also get about 
0.5VRMS 
when you spin a wheel.
Having said that my first sensor passed all that and was only diagnosable 

with a hammer.
IME sensor life varies from 2 to 14 years
You don't have RDK do you?
HTH
YMMV
Tim '92gts

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solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000
size=
=3D2>1.&nbsp;=20
  There's a small black plastic pipe coming off the PSD pump
(behind<BR>near=
side=20
  rear wheel arch liner) that looks to me like an overflow or<BR>pressure
re=
lief=20
  pipe of some kind?&nbsp; It's only 2-3mm in diameter.&nbsp;
I've<BR>just=20
  noticed it weeping a very small amount of what looks/smells
like<BR>brake=20
  fluid.&nbsp; Any ideas?<BR><BR>2. When the ignition circuit goes live
I'm=20
  hearing a small 'clunking'<BR>noise that seems to be from the same
nearsid=
e=20
  rear corner.&nbsp; It's an odd<BR>clunk that repeats quickly about 5/6
tim=
es=20
  and diminishes - a bit like<BR>the sound of dropped ball that bounces a
bi=
t=20
  less each time before<BR>stopping.&nbsp; Can't pinpoint what it is but
it=20=
has=20
  a metallic sound to it.<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Gareth,</DIV>
<DIV>haven't been in there for a few years but iirc there a line to the
diff=
,=20
small loom to the unit with multipin connector and a vent from near the
top=20=
of=20
the reservoir; hopefully your weep is from the vent.</DIV>
<DIV>i used to get a lot of clunking from the back when the last speed
senso=
r=20
went, i think the control unit sensed that wheel was going and the
others=20
weren't so locked the diff. Made turning on full lock a bit noisy (tyre
scru=
b)=20
too. Green light didn't always come on.</DIV>
<DIV>Previous sensor went in that mode too but that was rear left so
speedo=20
often ran up to 20 when stationary so that was an easy one!</DIV>
<DIV>Worth running a meter across the sensors to find 900+ Ohms across
the=20
sensor and infinite Ohms to earth from both sides. You can also get
about=20
0.5VRMS when you spin a wheel.</DIV>
<DIV>Having said that my first sensor passed all that and was only
diagnosab=
le=20
with a hammer.</DIV>
<DIV>IME sensor life varies from 2 to 14 years</DIV>
<DIV>You don't have RDK do you?</DIV>
<DIV>HTH</DIV>
<DIV>YMMV</DIV>
<DIV>Tim '92gts</DIV></FONT></BODY></HTML>

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 1 Posts in Topic:
Re: [928uk] PSD & odd sound
928uk@[EMAIL PROTECTED]   2006-07-26 09:37:02 

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