At 09:51 PM 1/10/2003, Dave Vieira wrote:
>im not sure if this is normal but I drive from
>Hamilton, Ontario to Toronto, Ontario witch is about
>80km and the gas meter is reading about half tank from
>a full tank there and back . so 160km .. is this
>right?

The halfway mark on the gauge is probably more than half a tank left -- but
that mileage still is terrible and suggests that your O2 sensor may be
driving the ECU full rich (or maybe a Temp II sensor problem, similar
effect).  Try unhooking the O2 sensor and see if your mileage doesn't
improve considerably.

Voltage at O2 sensor measured with high-impedance meter (10 Megohm) with
engine running and warm should be seen as varying above and below half a
volt -- if it is stuck low then ECU will think mix is lean and will keep on
making it richer until it runs out of adjustment.  This could be sensor, or
could be a short in the shielded (bright green) sensor wire.

Voltage at TII sensor with engine warm should be under a couple tenths of a
volt (on the non-grounded side of course).  With engine cold it should be
several volts, I forget the number -- somewhere between two and five,
depending on actual engine temp.

david

--
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"