If the harness is from the 87 T-Bird, you don't need to replace it. I have used a harness identical to it and the engine ran fine. I imagine what is going on is the harness in the non HO t-bird and cougar engines are identical to the HO harness. Either that or the batch fired computer fires with the same frequency as one cylinder on the SEFI computer. I don't know enough about the computers to tell you. I also don't have a harness from a cougar or t-bird to look at because i don't have the cougar anymore.
Check out the colors of the wires on your harness. If there is one common color and eight individual colors (one for each injector) then it is an SEFI harness like the HO's. I would guess that is what is going on.
PKRWUD - You seem to know a lot about the different configurations of the 5.0 motors. Why don't you check into a wiring diagram on a 87-88 T-bird / cougar.
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Michael Black
QuantumMotorsports
Norman, OK
1984 LX Hatch
306 w/ TRW forged flat toppers, Comp Cams Magnum 292H, GT40P heads w/ 3 angle valve job, .550 lift springs, Angus Racing Roller Rockers, Weiand Stealth Intake, Holley 4150 650cfm carb, MAC 1 5/8 Long Tubes, Single Chamber Flowmasters, 91' T5 w/ Pro 5.0 shifter, Turbo Coupe 8.8 Rear w/ 3.55 gears, QA1 Motorsports tubular K member, no interior except steering wheel and seat.
Coming soon: 6 or 8 point cage, Fuel Cell, Weld Draglites
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