More likely it is a bad O2 senor or a wiring issue. The O2 ground reference
is a separate circuit.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Roger Van Till
Sent: Thursday, May 26, 2005 8:47 PM
To: vanagon@GERRY.VANAGON.COM
Subject: ECU or O2 sensor ?

Just added an 86 GL automatic to the fold. The PO's mechanic (also a
PO) says it needs a new ECU.
The black wire to the O2 sensor was unplugged to fix the problem. I
plugged it back in to see what the deal was. It loses power and
stumbles when you give it gas.
Unplug the wire and it's fine. Is this really an ECU problem or should
I try a new O2 sensor? His mechanic wanted to charge him $800 for a
used unit!
The motor is a rebuild with 30,000 on it. Runs smooth, love it. Can't
say how old the O2 sensor is.
Thanks

Roger VanTill
89 Westy
86 GL