re. o2 sensor

[ben swann]

Perhaps they are both marginally out of spec.

On the same car I was referring to, I had the poor running during
warmup symptoms resolved by several different things.  The first time
it was the temp sender.  Replacement pretty much resolved the problem
it experienced during warmup.

A month later the problem recurred by exhibiting the same type of poor
running, only now it happened when water/snow hit the O2 sensor after
it was hot, or so it seems.  Disconnecting the O2 sensor removed the
symptoms.  I assume the oxy sensor is shot, although sometimes it works
fine, like in dry weather.

I guess I'll find out for sure after I replace it, but the car has been
back and forth to D.C. twice in during and after the storm, with no
poor running.  I had already been over the car, and the O2 sensor is of
the few things I did not address.

Anyway, I wanted to post my finding, as these syptoms can be caused by
many things it seems, and now I add the oxy sensor to the list.

BTW, if by water sensor you mean the f.i. temp sender which is located
on the bottom of the cooling neck on CIS-E cars, then that has always
killed any engine when disconnected.  I'm talking about the 3 or 4
4kq's I've had around for the last year.

On the 5kt's I forget what happens when the comparable multi-function
temp sendor is disconnected.

Ben
----- Original Message -----
From: John Booth <jrbooth3 at yahoo.com>
Date: Tuesday, February 18, 2003 3:09 pm
Subject: Re: re. o2 sensor

> when I disconnect mine it does not help that much but
> if I pull the water temp sensor it runs fine just
> rich.
> I had just replaced it last month so I must have
> gotten a bum one.
>
>
> --- ben swann <benswann at comcast.net> wrote:
> > John,
> >
> > I had been chasing an annoying problem with '84 4kq
> > I had sold to my
> > neighbor friend.  Seems the engine would start
> > running poorly.  Seemed
> > weather related, as acted up in heavy rain - eep
> > puddles, and at last
> > in the deep snow.  I had already been through the
> > F.I. system pretty
> > well, replacing the F.I. thermo sender which causes
> > the same problem.
> >
> > I hastily went through several basics and found the
> > culprit - O2
> > sensor.  Just disconnected it for now, so friend
> > could get to work.
> > The sensor and wires look great, but it was
> > definately throwing the
> > mixture off where the car wouldn't run right -
> > backfiring, jerking, not
> > revving above 2500RPM.
> >
> > Car has been starting and running just fine with O2
> > sensor disconnected
> > until we can replace it.  Mixture is set on the rich
> > sid for now.
> >
> > Thepartsconnection occasionally has these for a
> > great price.
> >
> > Ben
> >
> > [Has anyone had an 3 wire o2 sensor short out
> > internally? Mine today stopped working and my car
> > went
> > lean to the point not able to sustain power. I
> > hooked
> > up my dmm and it was showing 5.5 volts. I checked my
> > grounds and it was still high. I then disconnected
> > the
> > heater element and it went down to .45 I don't know
> > what happened but I obviously need a new one. Does
> > anyone know where to get the Bosch generic 3 wire at
> > the best deal?
> >
> > Thanks
> > John]
> >
> >
> >
>
>
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