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Unread 07-23-2010   #1 (permalink)
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Default 1992 Mustang LX Engine Harness in a 1990 LX

i was wondering if the engine harness out of a 1992 lx 5.0 will work in a 1990 lx 2.3 that is getting swapped to a 5.0 if anyone knows this please let me know. Anything helps Thanks, Nick
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1991 Mustang LX Budget Build, 5.0 rebuilt Stock crank and rods, .030 Forged Keith Black pistons, Ponydown 70mm turbo kit @ 12psi, Custom Built Intake, Fully Ported E-7s, Trick Flow Valve springs, Trickflow Stage 2 cam, FRPP 42# injectors, Walbro 255, PMAS 3 1/2" Blow through MAF, A9T ECM, 3.73 gears, Tremec TKO transmission, Steed Tri-ax shifter, fidanza aluminum flywheel, spec3 6 puck clutch, McLeod sfi bellhousing, Lakewood LCA UCA, 2.3 Front springs.
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Unread 07-24-2010   #2 (permalink)
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Will work may require some wires moved in the plugs, but shouldnt be anything major.
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Unread 07-24-2010   #3 (permalink)
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no it wont be plug&play.....

1990 will have 2 plugs that connect to the dash harness
1992 will have 1 plug,and depending on whether its early 1992 or late 1992,it may or may not have the fuel pump relays on the harness..in mid 1992-1993 ford moved the FP relays under the MAF instead of under the drivers seat like all the other years

if you have a 1990 dash harness,you need a 1990 engine/computer harness..its an oddball year

breakdown of compatible years:

87-89

1990

1991-mid 1992

mid1992-1993
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Unread 07-24-2010   #4 (permalink)
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That stinks but that is what i thought my luck would be, Those 1990 harnesses are hard find How hard is it to rewire the harnesses to make one work? Thanks for the help.
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1991 Mustang LX Budget Build, 5.0 rebuilt Stock crank and rods, .030 Forged Keith Black pistons, Ponydown 70mm turbo kit @ 12psi, Custom Built Intake, Fully Ported E-7s, Trick Flow Valve springs, Trickflow Stage 2 cam, FRPP 42# injectors, Walbro 255, PMAS 3 1/2" Blow through MAF, A9T ECM, 3.73 gears, Tremec TKO transmission, Steed Tri-ax shifter, fidanza aluminum flywheel, spec3 6 puck clutch, McLeod sfi bellhousing, Lakewood LCA UCA, 2.3 Front springs.
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Unread 07-24-2010   #5 (permalink)
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you're going to have to add/rearrange a whole bunch of wires and add and re-wire the 2nd connector

1992 only has 1 plug(orange) that plugs the dash harness into the engine harness

the 1990 has 2(1 black, 1 gray)
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Unread 07-24-2010   #6 (permalink)
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alright i guess i will have to just swap the dash harness also with this. thanks for all the help.
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1991 Mustang LX Budget Build, 5.0 rebuilt Stock crank and rods, .030 Forged Keith Black pistons, Ponydown 70mm turbo kit @ 12psi, Custom Built Intake, Fully Ported E-7s, Trick Flow Valve springs, Trickflow Stage 2 cam, FRPP 42# injectors, Walbro 255, PMAS 3 1/2" Blow through MAF, A9T ECM, 3.73 gears, Tremec TKO transmission, Steed Tri-ax shifter, fidanza aluminum flywheel, spec3 6 puck clutch, McLeod sfi bellhousing, Lakewood LCA UCA, 2.3 Front springs.
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Unread 07-24-2010   #7 (permalink)
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that might be even harder to do...

the 87-mid 1992 cars have the fuel pump relay under the drivers seat..the mid 1992-1993 cars have the fuel pump relay attached to the engine harness near the MAF

mix-matching the years may not have the proper wiring PIN'd correctly for the fuel pump relay which is under the seat in your 1990 body

heres a few 1990's for sale:
For Sale complete 1990 FI harness - Corral.net : Ford Mustang Forums

or PM this guy..he has tons of stuff
87-93 mustang wiring anything you need - Corral.net : Ford Mustang Forums

its waaaaaay easier to just get the right harness..believe me..i just went thru the whole 4cyl swap thing..its a PITA..and i'd rather change a computer harness than a dash harness ANY day of the week..pulling the whole dash out..thats a **** job....
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Best so far: 10.92 @ 123mph with a 1.49 60ft
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