ECM fault?

[David Cooley]

At 09:37 AM 11/9/1999 -0500, you wrote:
>I just verified that Oxygen sensor we put was genuine GM. The output,
>however seems slow. Maybe it should be, because the mixture might be
>leaning/riching slowly.

The way O2 sensors work is they swing rapidly from rich to lean... Should 
be several times a second.  If it's slow, then maybe there is a problem in 
the harness with a bad connection.  Try looking at it's output with the O2 
sensor disconnected from the harness...  Will set a code, but should see 
the voltage swinging properly until the ECM commands full rich mode to 
protect itself.
Was anything done to the vehicle before it started acting this way?

===========================================================
David Cooley N5XMT Internet: N5XMT at bellsouth.net
Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
We are Borg... Prepare to be assimilated!
===========================================================