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Discuss Oxygen Sensor in the alt.trucks.chevy forum at Car Dealer Forums; I found the oxygen sensor had been broken off on the 1995 chevy k1500 5.7L ...
  1. #1
    Ringer
    Guest

    Default Oxygen Sensor

    I found the oxygen sensor had been broken off on the 1995 chevy k1500 5.7L
    truck I recently bought. The only cut wire I can see near there is a large
    dark blue wire. The wiring diagram says it should be a purple one and
    doesn't say what gauge it is. Does anyone know of an oxygen sensor with a
    big blue wire attached to it?





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  2. #2
    Steve W.
    Guest

    Default Re: Oxygen Sensor

    Ringer wrote:
    > I found the oxygen sensor had been broken off on the 1995 chevy k1500 5.7L
    > truck I recently bought. The only cut wire I can see near there is a large
    > dark blue wire. The wiring diagram says it should be a purple one and
    > doesn't say what gauge it is. Does anyone know of an oxygen sensor with a
    > big blue wire attached to it?
    >
    >



    Which trans does it have? The 4L80E equipped vehicle uses a different
    sensor than the 4L60E.
    One (4L80E) is single (purple) wire while the other is a 3 wire (purple,
    black, pink) On either one the signal wire is purple. The pink & black
    wires are for a heated O2 sensor.
    If the sensor was broken off the wires going up front may have been
    ripped out of the harness itself.

    Connection A10 on the ECM is the O2 signal line.
    On the 3 wire the Pink is fed from fuse Eng-1 (20A) in the under hood
    box. The Black is a GOOD ground.

    --
    Steve W.

  3. #3
    Ringer
    Guest

    Default Re: Oxygen Sensor

    Steve W. wrote:
    > Ringer wrote:
    >> I found the oxygen sensor had been broken off on the 1995 chevy
    >> k1500 5.7L truck I recently bought. The only cut wire I can see near
    >> there is a large dark blue wire. The wiring diagram says it should
    >> be a purple one and doesn't say what gauge it is. Does anyone know
    >> of an oxygen sensor with a big blue wire attached to it?
    >>
    >>

    >
    >
    > Which trans does it have? The 4L80E equipped vehicle uses a different
    > sensor than the 4L60E.
    > One (4L80E) is single (purple) wire while the other is a 3 wire
    > (purple, black, pink) On either one the signal wire is purple. The
    > pink & black wires are for a heated O2 sensor.
    > If the sensor was broken off the wires going up front may have been
    > ripped out of the harness itself.
    >
    > Connection A10 on the ECM is the O2 signal line.
    > On the 3 wire the Pink is fed from fuse Eng-1 (20A) in the under hood
    > box. The Black is a GOOD ground.


    It's a manual transmission. The original engine was a 4.3l v6 but they had
    put in a 5.7l v8. I'm trying to get to the ECM to see if I can trace the
    blue wire back to that connection as all the connectors seem to be behind
    the brake master cylinder.



  4. #4
    Steve W.
    Guest

    Default Re: Oxygen Sensor

    Ringer wrote:
    > Steve W. wrote:
    >> Ringer wrote:
    >>> I found the oxygen sensor had been broken off on the 1995 chevy
    >>> k1500 5.7L truck I recently bought. The only cut wire I can see near
    >>> there is a large dark blue wire. The wiring diagram says it should
    >>> be a purple one and doesn't say what gauge it is. Does anyone know
    >>> of an oxygen sensor with a big blue wire attached to it?
    >>>
    >>>

    >>
    >> Which trans does it have? The 4L80E equipped vehicle uses a different
    >> sensor than the 4L60E.
    >> One (4L80E) is single (purple) wire while the other is a 3 wire
    >> (purple, black, pink) On either one the signal wire is purple. The
    >> pink & black wires are for a heated O2 sensor.
    >> If the sensor was broken off the wires going up front may have been
    >> ripped out of the harness itself.
    >>
    >> Connection A10 on the ECM is the O2 signal line.
    >> On the 3 wire the Pink is fed from fuse Eng-1 (20A) in the under hood
    >> box. The Black is a GOOD ground.

    >
    > It's a manual transmission. The original engine was a 4.3l v6 but they had
    > put in a 5.7l v8. I'm trying to get to the ECM to see if I can trace the
    > blue wire back to that connection as all the connectors seem to be behind
    > the brake master cylinder.
    >
    >


    Still should have the same wiring colors. With a stick/4.3 it should
    have the 3 wire sensor harness. The O2 sensor is the same part for the
    4.3 and 5.7 with a stick.

    --
    Steve W.

  5. #5
    Ringer
    Guest

    Default Re: Oxygen Sensor

    Steve W. wrote:
    > Ringer wrote:
    >> Steve W. wrote:
    >>> Ringer wrote:
    >>>> I found the oxygen sensor had been broken off on the 1995 chevy
    >>>> k1500 5.7L truck I recently bought. The only cut wire I can see
    >>>> near there is a large dark blue wire. The wiring diagram says it
    >>>> should be a purple one and doesn't say what gauge it is. Does
    >>>> anyone know of an oxygen sensor with a big blue wire attached to
    >>>> it?
    >>>
    >>> Which trans does it have? The 4L80E equipped vehicle uses a
    >>> different sensor than the 4L60E.
    >>> One (4L80E) is single (purple) wire while the other is a 3 wire
    >>> (purple, black, pink) On either one the signal wire is purple. The
    >>> pink & black wires are for a heated O2 sensor.
    >>> If the sensor was broken off the wires going up front may have been
    >>> ripped out of the harness itself.
    >>>
    >>> Connection A10 on the ECM is the O2 signal line.
    >>> On the 3 wire the Pink is fed from fuse Eng-1 (20A) in the under
    >>> hood box. The Black is a GOOD ground.

    >>
    >> It's a manual transmission. The original engine was a 4.3l v6 but
    >> they had put in a 5.7l v8. I'm trying to get to the ECM to see if I
    >> can trace the blue wire back to that connection as all the
    >> connectors seem to be behind the brake master cylinder.
    >>
    >>

    >
    > Still should have the same wiring colors. With a stick/4.3 it should
    > have the 3 wire sensor harness. The O2 sensor is the same part for the
    > 4.3 and 5.7 with a stick.


    I got to the ecm. Haven't traced the wires yet but I got some numbers off
    the prom. Can't find anything on line to id it though. The number was delco
    9946 bjww.



  6. #6
    Steve W.
    Guest

    Default Re: Oxygen Sensor

    Ringer wrote:
    > Steve W. wrote:
    >> Ringer wrote:
    >>> Steve W. wrote:
    >>>> Ringer wrote:
    >>>>> I found the oxygen sensor had been broken off on the 1995 chevy
    >>>>> k1500 5.7L truck I recently bought. The only cut wire I can see
    >>>>> near there is a large dark blue wire. The wiring diagram says it
    >>>>> should be a purple one and doesn't say what gauge it is. Does
    >>>>> anyone know of an oxygen sensor with a big blue wire attached to
    >>>>> it?
    >>>> Which trans does it have? The 4L80E equipped vehicle uses a
    >>>> different sensor than the 4L60E.
    >>>> One (4L80E) is single (purple) wire while the other is a 3 wire
    >>>> (purple, black, pink) On either one the signal wire is purple. The
    >>>> pink & black wires are for a heated O2 sensor.
    >>>> If the sensor was broken off the wires going up front may have been
    >>>> ripped out of the harness itself.
    >>>>
    >>>> Connection A10 on the ECM is the O2 signal line.
    >>>> On the 3 wire the Pink is fed from fuse Eng-1 (20A) in the under
    >>>> hood box. The Black is a GOOD ground.
    >>> It's a manual transmission. The original engine was a 4.3l v6 but
    >>> they had put in a 5.7l v8. I'm trying to get to the ECM to see if I
    >>> can trace the blue wire back to that connection as all the
    >>> connectors seem to be behind the brake master cylinder.
    >>>
    >>>

    >> Still should have the same wiring colors. With a stick/4.3 it should
    >> have the 3 wire sensor harness. The O2 sensor is the same part for the
    >> 4.3 and 5.7 with a stick.

    >
    > I got to the ecm. Haven't traced the wires yet but I got some numbers off
    > the prom. Can't find anything on line to id it though. The number was delco
    > 9946 bjww.
    >
    >

    Won't matter. The 4.3, 5.7, and 7.4 all used the same ECM and PROM type.
    It is how that prom is flashed that creates the magic.
    4.3 to 5.7 is almost a drop in anyway. You only need a few pieces for
    the conversion. Basically a different fan shroud and change a few hoses.

    If this truck was running before I would say you just need to figure out
    the wiring issue.

    --
    Steve W.

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