02 Sensor Swap Information

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  • #31
    I'm trying to figure out if my 88 turbo computer can use a Zirconia sensor. I seems the two sensers give reading in very different ways. Zirconia is 1V OR 0V where the Titania gives the computer a resistance reading less than 1V. Are the computers different in how they interperet the sensor reading?
  • #32
    Titania-type oxygen sensors are not compatible with zirconium type, and vise versa. Zirconium sensors relay a 0-1v signal and Titania sensors vary resistance to give the ECU its mixture feedback data. If you wanted to switch sensors to accommodate a 86-89T ECU, the wiring in the engine wiring harness would need to be changed, as well as the oxygen sensor bung (Titania are 17MM and Zirconium are 22MM). I grabbed this from jason's site!
    Just as I suspected. Still not sure how the get the damn Titania sensor in that T3 o2 elbow.
  • #33
    Have someone with an impact pull out the insert that the o2 bolt sinto out of the exhausts and just use the one you need.
  • #34
    I didn't think the o2 fitting/bung was the same thread where it screws into the o2 elbow. Sweet! Thanks.

    UPDATE: the o2 fittings/bungs can be swapped from elbow to elbow for a T25 to T3 swap. :super
  • #35
    sooo. my 87 88 or 89 n/a ecu will work with my 88 turbo engine? with or without nistune just for it to start and tune?
    I'm back. Ditched the chevy shit for some z lovin'.

    under the knife, get ready.
  • #36
    Jersey88z wrote: I didn't think the o2 fitting/bung was the same thread where it screws into the o2 elbow. Sweet! Thanks.

    UPDATE: the o2 fittings/bungs can be swapped from elbow to elbow for a T25 to T3 swap. :super
    Another way woulda been getting an elbow from an 86-87 turbo which had T3s and Titania sensors. Also, Titania varies resistance 0-5v in most cases, not sure if the Z31s runs up to 5v or not.

    On another note, I wired my 84T (running 86NA ECU /w Titania o2) like people claimed (grounding the yellow wire), Nistune reports back 0v at all times from the o2. So whoever came to the conclusion this way works, idk how much of that I believe.

    Roach wrote:     sooo. my 87 88 or 89 n/a ecu will work with my 88 turbo engine? with or without nistune just for it to start and tune?
    If you want to use a NA ECU with a turbo, you'll need Nistune to tune it.
    - VG30DET (HE341) 86 300ZX - 1982 280ZX Turbo - Headered NA 1986 300ZX 2+2 - 2000 Xterra -
  • #37
    My car is an 87T that has an 87NA ecu (fitted with nistune).

    The other two wires were the same, the yellow was not, it goes into the ECU on pin 115. I had to add a pin there, since there wasn't one for the 87T harness.

    So I have 87T engine and harness, 87NA ecu.
  • #38
    bemis wrote: This Sticky was designed to address the issue of 02 sensor swapping, between Titania and Zirconia, due to engine harness or ECCS changes.

    Using the information here, one should be able to easily swap 02 sensors if they have basic reading and wiring skills.

    Here's the difference between the two sensors:





    Here's how the two different 02 sensor styles are wired up according to the Factory Service Manual:



    Here's a list of what kind of 02 sensor came with the Z31's from the factory:

    1984-1985; 1987-1989 NA: Zirconia
    1986 NA & Turbo: Titania
    1987-1989 Turbo: Titania

    The ECCS is designed to only use one type of 02 sensor, either Titania or Zirconia. No exceptions.
    Great info....
    Too bad the pics are gone :-(
  • #39
    Hey Guys,

    Can you please tell me which O2 sensor I should be using for this 86 N/A ECU?
    1986 23710-18P03/A18-650M24

    I think it should be the Titania type but just want to be sure so the mixture ratio feedback works.
    Also, would I need to get a genuine or would a aftermarket one work?
    I Drink, therefore I am....
    84 50th AE, Australian Version (N/A, 2+2, Cloth interior, Digi Dash and Auto Climate control)
  • #40
    bemis wrote:

    1984-1985; 1987-1989 NA: Zirconia
    1986 NA     & Turbo: Titania
    1987-1989 Turbo: Titania
    Now my question is, will using the wrong O2 sensor(eg.86na with a Zirconia O2) make the car run worst than not having an O2 sensor hooked up at all???
    I just swap an 87na engine into an 86na and started it up no prob with no o2 hooked up. I realized it wasn't hooked up and so I plugged it in. Now the car wont idle or run unless I give it gas. Help please
  • #41
    Yeah it'll work fine you'll just sacrifice gas mileage and a good afr. I did it and boosted often with no issues. In turn it may have helped me running slightly rich.
    I'm back. Ditched the chevy shit for some z lovin'.

    under the knife, get ready.
  • #42
    I replaced my dead 88zx T25 with an 84 T3 turbo. When the oxygen sensor from my 88 didn't fit I cut the wires and used the 84 oxy sens with the 88 harness plug. They were both 3-wire with red white and black wires so I just used wire connectors and shrink wrap. The car seems to run fine, no issues even though the T3 oxy sens (I just discovered) is supposedly incompatible.....Am I running in "limp mode" or what? Will it hurt my ecu? It sounds like I could just swap out the bungs in the down pipes (assuming it will come out) but I'm not having any pre-ignition pinging or runability problems going on even though I'm using my 88 ecu. Everybody was saying I'd have problems but I'm not. (YET) Any ideas? I don't want to kill my ecu or damage the engine. If it is running a little richer due to the incorrect oxy sens mabey that's a good thing?
    86 NA 5-sp
    88 Turbo, auto
    84 50th AE parts car
    07 Parnelli Jone Saleen Mustang
    69 Mach I 428scj
    68 CSGT 428cj
    70 Torino Cobra 429scj
    and a few more, been collectin awhile
  • #43
    csgt428 wrote: I replaced my dead 88zx T25 with an 84 T3 turbo. When the oxygen sensor from my 88 didn't fit I cut the wires and used the 84 oxy sens with the 88 harness plug. They were both 3-wire with red white and black wires so I just used wire connectors and shrink wrap. The car seems to run fine, no issues even though the T3 oxy sens (I just discovered) is supposedly incompatible.....Am I running in "limp mode" or what? Will it hurt my ecu? It sounds like I could just swap out the bungs in the down pipes (assuming it will come out) but I'm not having any pre-ignition pinging or runability problems going on even though I'm using my 88 ecu. Everybody was saying I'd have problems but I'm not. (YET) Any ideas? I don't want to kill my ecu or damage the engine. If it is running a little richer due to the incorrect oxy sens mabey that's a good thing?
    Get a O2 bung from a 86 or 87 turbo and swap it out (it just threads in…), or the 88-89 one may work, not sure....

    BTW, Z31s runner richer than stock is never a good thing…they run waaay too rich as it is. LOL Anyways, 86 and 87s have T3s with the proper O2 sensor for 88-89 turbo ECUs.
    - VG30DET (HE341) 86 300ZX - 1982 280ZX Turbo - Headered NA 1986 300ZX 2+2 - 2000 Xterra -
  • #44
    Wow, that was fast. Thanx for the info. So, do you mean I can buy a new oxy sens for an 86-7 T3 turbo that will fit in my 84 T3 downpipe and plug into my 88 harness without changing the bungs out?
    86 NA 5-sp
    88 Turbo, auto
    84 50th AE parts car
    07 Parnelli Jone Saleen Mustang
    69 Mach I 428scj
    68 CSGT 428cj
    70 Torino Cobra 429scj
    and a few more, been collectin awhile
  • #45
    csgt428 wrote: Wow, that was fast. Thanx for the info. So, do you mean I can buy a new oxy sens for an 86-7 T3 turbo that will fit in my 84 T3 downpipe and plug into my 88 harness without changing the bungs out?
    No, it wont fit in the exhaust elbow from the 84 (its not a downpipe, the downpipe is the piece of exhaust that bolts to the cast elbow that has the o2 sensor)

    You still need to swap the bung.
    - VG30DET (HE341) 86 300ZX - 1982 280ZX Turbo - Headered NA 1986 300ZX 2+2 - 2000 Xterra -
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