Re: ur-Q Oxygen Sensor Question

[Robert Houk - WorkGroup Server Firmware <Robert.Houk@East.Sun.COM>]

   Good Afternoon, Listers!

   Before I went ahead and bought a new oxygen sensor for the ur-Q, I decided
   to check
   the voltage coming from it. No voltage until it's warmed up, of course...
   after that, I
   was seeing, at first, about .1v, then upto about .125v, then after the
   radiator fan began
   to cycle, I was getting about .25v.

   Is this correct voltage? Should I start looking elsewhere for the cause of
   my solid 50%
   OXS duty cycle?

Is a problem!

        Voltage curve of the Lambda sensor at
        an operating temperature of 600C.

	      0.6   0.8   1.0   1.2   1.4
	      =============v=============
	 1000 | -------\   .
     V	      |         \  .
     o	      |          \ .
     l	  800 |          | .
     t	      |          | .
     a	      |           \.
     g	  600 |           |.
     e	      |           |.
	      |           |.
	  400 |           |.
   (mv)	      |           |.
	      |            \
	  200 |            .|
	      |            .|
	      |            .|
	    0 |            . \-----------
	      ===========================
	      0.6   0.8   1.0   1.2   1.4
                    Excess-air factor

You're running lean. Bad. Bad. Bad.

Outside chance your static mixture is way way lean -- this is adjusted
via 3mm (??) hex on the top front of the fuel distributor assembly.

I'm gonna guess low fuel system pressure -- clogged fuel filter? Bad
fuel pump? Weak/failed regulator spring (system pressure regulator
in the fuel distributor)? Bad Control pressure regulator?

Of course it could be a bad O2 sensor, and replacing it is a) probably
time to anyway b) relatively easy and cheap.

Debug time...good luck!

					-RDH