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Type: Posts; User: lionelhutz

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  1. Thread: O2 ?

    by lionelhutz
    Replies
    45
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    32,710

    You're hardly doing any extra work for the better...

    You're hardly doing any extra work for the better wiring. The wire already comes from the ECU to the block. So, just disconnect it from the block and extend it to the O2 sensor.
  2. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    The sensing element in the O2 sensor is NOT...

    The sensing element in the O2 sensor is NOT isolated!!!

    http://www.ti.com/lit/ds/symlink/lm9044.pdf

    Page 1 clearly shows grounding the negative side at the sensor. The sensors have the...
  3. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    I would bet money the PCM in this thread uses a...

    I would bet money the PCM in this thread uses a lambda IC and can be hooked to a 4-wire sensor as I suggested.

    The negative side of the sensor element in a 4-wire sensor is still tied to the case...
  4. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    Why is a separate wire needed if it's just...

    Why is a separate wire needed if it's just grounded to the other ground pins?




    Where can I see the original design documents used for the '7747 ECM?
  5. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    It should be $0E. ...

    It should be $0E.

    http://www.gearhead-efi.com/Fuel-Injection/showthread.php?337-16196395-PCM-Information-OE
  6. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    The tan is a completely different circuit than...

    The tan is a completely different circuit than the other grounds. On the GM's I have worked on it's a separate wire to a separate ring terminal attached to the engine. The ECM terminal connects to a...
  7. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    Every ECM I have ever looked at (for example...

    Every ECM I have ever looked at (for example '7749 or '7747 from 1987 or newer) has an O2 return terminal on the PCM and a separate dedicated wire from this terminal to the block. If I'm recalling...
  8. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    Why would you take the 4-wire sensor element...

    Why would you take the 4-wire sensor element ground or negative wire to the engine block? Since It can be connected directly to the ECM O2 input circuit, it should be. This is a separate wire from...
  9. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    Change it to a 4-wire sensor. Then, find the...

    Change it to a 4-wire sensor. Then, find the negative sensor input wire and remove it from the engine ground and take it to the 4-wire sensor plug instead.

    It would be pointless connecting the...
  10. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    Both have a connection between the negative of...

    Both have a connection between the negative of the element and the case of the sensor.

    A 3-wire used the case for the signal path. The case connects to the exhaust, the exhaust connects to the...
  11. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    The 4-wire has a sensor element negative or...

    The 4-wire has a sensor element negative or return wire that runs directly to the ECU so that it doesn't rely on the exhaust as the signal path.
  12. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    Yes, one wire will be power and the other will be...

    Yes, one wire will be power and the other will be ground.
  13. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    A wideband measures lambda, not AFR. You use it...

    A wideband measures lambda, not AFR. You use it to confirm that operation modes like WOT are correct since the NB can't read the fuel enrichment.

    The 2 white wires should be the heater element and...
  14. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    It should be OK since the configuration is close...

    It should be OK since the configuration is close to stock. I would check that the heater is working. Try cutting down the sensor bung and see what happens.
  15. Thread: O2 ?

    by lionelhutz
    Replies
    45
    Views
    32,710

    That's the stock location, right? If yes, then it...

    That's the stock location, right? If yes, then it should be fine there. Just shorten that bung so the whole sensor nose is in the pipe. The bung should just be long enough to hold the threads.

    Is...
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