Fwd: RE: Oxygen Sensors

[David Cooley]

Hey all,
FYI, my O2 sensor problem I had a year ago with a BOSCH replacement on my 
95 buick lesabre is resolved...



>From: "Brom Kenneth (UA/AMA3)" <Kenneth.Brom at us.bosch.com>
>To: "'David Cooley'" <n5xmt at bellsouth.net>
>Subject: RE: Oxygen Sensors
>Date: Wed, 12 Jul 2000 15:23:51 -0500
>X-Mailer: Internet Mail Service (5.5.2650.21)
>
>Hello Dave:
>
>Thanks to your email, we discovered a design variation in our sensor
>involving the grounding, that, depending on the ECU used by GM, would result
>in the trouble you had.
>
>We conducted a recall, re-engineer and re-distribution of the 15703 to
>resolve any future problems in the field.
>
>Best Regards,
>
>
>Kenneth Brom
>UA/AMA2
>Robert Bosch Corporation
>Broadview, IL.
>708-865-5335
>708-865-6433 (fax)
>kenneth.brom at us.bosch.com
>
>
> > ----------
> > From:         David Cooley
> > Sent:         Thursday, June 29, 2000 11:28 PM
> > To:   Brom Kenneth (UA/AMA3)
> > Subject:      RE: Oxygen Sensors
> >
> > Ken,
> > Never heard back... What was the final outcome???
> >
> >
> > At 05:35 PM 9/18/98, you wrote:
> > >Hello David:
> > >
> > >Thanks for the detailed information.
> > >
> > >I will arrange for 2 extensive testing procedures to be performed on 2
> > >sample OEM and Bosch sensors at our development facility in Farmington
> > >Hills, Michigan.
> > >
> > >I would expect the process to take about 3 weeks, and I will keep you
> > >informed.
> > >
> > >Thanks for your patience and understanding.
> > >
> > >Regards,
> > >Ken.
> > >
> > > > ----------
> > > > From:         David A. Cooley
> > > > Sent:         Tuesday, September 15, 1998 12:10 AM
> > > > To:   Brom Kenneth (UA/AMA3)
> > > > Subject:      Re: Oxygen Sensors
> > > >
> > > > Hi Kenneth,
> > > > Thanks for the quick response.
> > > > Here is the problem I'm having...
> > > > The original AC/Delco O2 sensor has the  - output of the O2 sensor
> > > > grounded
> > > > to the shell.  Mine had 80,000 miles and was getting very sluggish,
> > > > mileage
> > > > dropping etc, so I purchased the 15703.  It is listed as a direct
> > > > replacement for the 1995 Buick Lesabre vin code L 3.8 V6.
> > > > I installed it and the car, as soon as coolant temp came up a bit,
> > went
> > > > full
> > > > rich and the exhaust was billowing black smoke.  I took it for a drive
> > > > quickly to see if maybe the PCM just needed to learn the new Sensor's
> > > > output... No luck.  I figured then the O2 I was sold may have a
> > problem.
> > > > Using my Digital Volt Meter (>1Meg ohm/volt input impedance) I probed
> > the
> > > > sensor + and -... It was sitting at 980mV at idle and at 3500 RPM as
> > well.
> > > > I shut the car off and let it cool, then started it again and watched
> > the
> > > > output...
> > > > Over about 30 seconds, it went from 0mV to 980mV again.  I took it out
> > and
> > > > it was solid with soot.  Put the old one in and the car started and
> > ran
> > > > fine... O2 volts hovered around 450mV but not very active... no more
> > black
> > > > smoke.  Went and returned it for another 15703... Same problem.  This
> > time
> > > > when I went to check the voltage, I probed from the sensors + lead to
> > the
> > > > engine block... I showed 1.98V!!!
> > > > From the - lead to the block I showed 1.0 Volts.  Removed it and
> > checked
> > > > resistance from the - lead to the Shell, and it was infinite (> 20Meg
> > > > Ohms)... I checked the factory AC sensor, and the - lead was bonded
> > > > internally to the shell.  Putting the Bosch 15703 back in and adding a
> > > > jumper from the - lead of the O2 to Ground made the car start running
> > > > properly, and the sensor voltage was hovering around 450mV and VERY
> > > > active.
> > > > Mileage has come back to where I have been used to plus a bit better!
> > A
> > > > call to GM Tech support confirmed that the shell is supposed to be
> > bonded
> > > > to
> > > > the - lead of the O2 sensor...  It is isolated at the PCM and in the
> > > > harness
> > > > to eliminate ground loops.
> > > > I went to the Napa autoparts store across the street from Autozone
> > where I
> > > > purchased the Bosch unit, and asked if I could check the Echlin and AC
> > > > sensors they had in stock... Both had the - lead bonded internally to
> > the
> > > > shell.
> > > > Just thought you might want this info for a production mod, or a new
> > part
> > > > specifically for this application.
> > > >
> > > > Thanks for your time,
> > > > Dave Cooley.
> > > >
> > > > -----Original Message-----
> > > > From: Brom Kenneth (UA/AMA3) <Kenneth.Brom at pcm.bosch.com>
> > > > To: 'David A. Cooley' <n5xmt at bellsouth.net>
> > > > Date: Monday, September 14, 1998 9:08 AM
> > > > Subject: RE: Oxygen Sensors
> > > >
> > > >
> > > > >Hello David:
> > > > >
> > > > >Thanks for contacting Bosch.
> > > > >
> > > > >Please feel free to contact me regarding your concerns with our
> > Oxygen
> > > > >Sensors, namely part number 15703 which you mentioned.
> > > > >
> > > > >Regards,
> > > > >
> > > > >Kenneth Brom
> > > > >RBUA/AMA2
> > > > >Bosch Broadview
> > > > >708-865-5335 (ph)
> > > > >708-865-6433 (fax)
> > > > >kenneth.brom at pcm.bosch.com
> > > > >
> > > > >> ----------
> > > > >> From: David A. Cooley
> > > > >> Sent: Friday, September 11, 1998 12:24 AM
> > > > >> To: bosch at sol.tins.net
> > > > >> Subject: Oxygen Sensors
> > > > >>
> > > > >> Would like to know who I can talk to about a design flaw in at
> > least
> > > > one
> > > > >> of the BOSCH aftermarket Oxygen sensors (P.N. 15703).
> > > > >> Thanks,
> > > > >> Dave Cooley
> > > > >>
> > > > >
> > > >
> >
> > ===========================================================
> > 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!
> > ===========================================================
> >
> >

===========================================================
David Cooley N5XMT Internet: N5XMT at triad.rr.com
Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
I am Pentium of Borg... Division is Futile!
===========================================================

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