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Thread: O2 sensor bung

  1. #11
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  2. #12
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    His sensor is still 4 wires, whether the signal ground goes to the back of the head (orange wire) or all the way to the EEC. Grounding to the the engine IS noisier, but with high quality grounds and ordinary noise suppression methods, it should be good enough for his purposes. The point I was making, however, is that his 87 doesn't ground the sensor through the threads, and it is heated.
    1988 Thunderbird 5.0
    GT40P, TFS-1, KB domes, 30#, MAF conversion, Explorer GT40 Upper/Lower, Smog delete, Wide Ratio AOD Mod, Unlocked Speedo, 3G Charging System Upgrade, Hi-Torque Mini Starter, 3.73 LSD, BBK 1 5/8 unequal headers, H-Pipe.

    88 Thunderbird/Cougar EVTM
    (Thanks to Trinom for hosting)

  3. #13
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    LOL,, you arei right again,,, here i is that ground wire point........... which is under the braided cable i made... it is orange.

    i located my original braided flat ground lead so i removed this one i show and installed the original.
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  4. #14
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    87 3 wire O2 sensor:
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    Last edited by softtouch; 05-11-2018 at 04:14 PM.

  5. #15
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    Well, shit. I guess I take it back.
    1988 Thunderbird 5.0
    GT40P, TFS-1, KB domes, 30#, MAF conversion, Explorer GT40 Upper/Lower, Smog delete, Wide Ratio AOD Mod, Unlocked Speedo, 3G Charging System Upgrade, Hi-Torque Mini Starter, 3.73 LSD, BBK 1 5/8 unequal headers, H-Pipe.

    88 Thunderbird/Cougar EVTM
    (Thanks to Trinom for hosting)

  6. #16
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    yeah,, thats what i was trying to say but since you brought up the technicality of the orange wire,,, that would make it a 4 wire thingy but they are actually 3wire.

  7. #17
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    on 87 & 88 cars the orange wire is under the braided cable on the driver side which is attached at the fire wall just next the the accelerator cable.

    so the orange wire belongs on the fire wall, not the head.

    te braided cable is on the same spot on the fire wall and lands on the rear of the driver head.

    same point electrically but just sayin.....

  8. #18
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    Interesting...the tbird-cougar is different? I've always seen the mustangs either to the back of the head or the rear lower intake stud ( mine). The Turbocoupe has it on the turbo compressor housing. I've never seen it paired up with the braided cable to the firewall.

    John

  9. #19
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    When I got my car, it was already a Mark VII HO swap. engine, trans, exhaust; which included the EEC and complete engine harness, so some things on my car don't conform to T-Bird/Cougar wiring books. My orange wire goes from the EEC to the back of the head, then from the back of the head to a splice and to each HEGO, and mine are 4 wire, as far as I can tell, not like T-bird/Cougar or Mustang. Or really even like Mark VII books. When I lost the HEGO sub harness during my last build, I had to build a new one from memory and that's how I built it.
    1988 Thunderbird 5.0
    GT40P, TFS-1, KB domes, 30#, MAF conversion, Explorer GT40 Upper/Lower, Smog delete, Wide Ratio AOD Mod, Unlocked Speedo, 3G Charging System Upgrade, Hi-Torque Mini Starter, 3.73 LSD, BBK 1 5/8 unequal headers, H-Pipe.

    88 Thunderbird/Cougar EVTM
    (Thanks to Trinom for hosting)

  10. #20
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    Quote Originally Posted by jcassity View Post
    on 87 & 88 cars the orange wire is under the braided cable on the driver side which is attached at the fire wall just next the the accelerator cable.

    so the orange wire belongs on the fire wall, not the head.

    te braided cable is on the same spot on the fire wall and lands on the rear of the driver head.

    same point electrically but just sayin.....
    My 88 is set up this way. I did add a ground wire from the ground point on the firewall to a stud on the back of the intake. Didn't seem to make any difference but it makes me feel better .
    '88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, Edelbrock 70mm TB, 76mm C&L MAF, 30lb injectors, 2.5" exhaust, AOD with 2800 PI converter, 8.8 with 3.73 gears, 31 spline Traction-Lok, 31 spline Moser axles, 04 Cobra front arms, Maximum Motorsports extreme duty rear arms, subframes.
    '11 Focus, '12 Mustang 3.7, '17 Accord EX-L V6

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