Fuel Range Indication -Reply

[Gary Webster <GARY@synaxis.com>]

GKW>>I am pretty sure that the problem is in the computer itself.  My
89 200TQ had the same problem under warranty and again now.  The
dealer replaced the computer and the problem went away for a while. 
Mine is very erratic, but if you shut the car off and re-start it, the
display is correct when it is initially re-started.  In a minute or two, it
usually takes off to the 800-1000 mile range.  

>>> Phil Payne <Phil@sievers.demon.co.uk> 11/27/94 06:29am >>>
My 1988 ur-quatro (digital) has taken to showing infinite fuel range.  It
looks  like fuel consumption is not being registered by the computer. 
The fuel gauge  is OK - I suspect some impulse from the fuel injection
system is not getting  through. 

Not having a wiring diagram, I have no idea which connector and wire
carry this  information.  Any clues, anyone?

I also noticed that the camshaft cover breather pipe (camshaft cover to
inlet  air plenum chamber) had a 1/4" hole in its underside caused by
rubbing against  a clipped-off cable tie.  If only the assembly line had
turned it over after  clipping it off ...

(BTW -appropos of electrical problems. After the chassis bonding wire
to the  inlet manifold failed on Tuesday, I decided to formalise the
emergency repair.  I discovered that all three brown wires bonded to
the inlet manifold were  seriously damaged by flexure at the point
where they left the wiring loom.  Not  perhaps surprising in a 100k
engine - they must have rattled about a bit. Also,  the ignition to
camshaft cover strap was seriously corroded and generally  disgusting
at the engine end.  Plus the garage that replaced the turbo put one 
wiring harness retaining clip in upside down, stressing the harness ...)

Phil Payne
Sievers Consulting UK
Vice Chair, UK Computer Measurement Group
+44 385 302803 Fido 2:2503/415  CIS 100012,1660