5.0 swap need wiring help ASAP!!!

samstigg · April 24th, 2008, 11:37 PM

Greetings all, I am new to this site and am in dire need of help. I have just done a 2.3 to 5.0 conversion. I think I may have messed up on my choice for ECM and wiring harness. I swapped a 5.0 out of a 90' LX completewith ECM and engine harness into a 92' 2.3 LX, My problem is that i get basic power to the ignition (lights work, turn signals, Heater fan, etc.) however turning the key to the "On" posistion..the fuel pump does not prime,, then the key over to crank the motor..nothing happens. In addition when I turn my head lights on the horn blows along with the lights turning on.

Guys I need some serious help on this one!!!

Thanks in advance

FoxHoss · April 25th, 2008, 03:09 AM

oh gosh, im doing this swap rite now, an 89 to an 89 tho... im swapping the ECM and related harness in the next day or so, hope you find hte problem. let me know if you find the problem so i dont go down the same path, good luck bro

e3sean · April 25th, 2008, 06:18 AM

change the relay that is next to the computer. make sure the computer harness has a good ground. i just had the same symptoms and it was the ecu harness main relay next to the ecu

samstigg · April 25th, 2008, 08:41 AM

Ithink you will be fine, using 89' to 89'. I think part of my problem might be the fact that I have a 92' an used the ECM and Harness from a 90', things changed a little between those years. I will check the power relay, it was swapped out in with the 90' haress, but maybe it was bad to begin with. any other ideas just in case??? what about the fuel relay??

April 24th, 2008, 11:37 PM	#1
samstigg Newbie 1992 Mustang LX Join Date: Feb 2008 Location: Eastern Shore, VA Posts: 5	5.0 swap need wiring help ASAP!!! Greetings all, I am new to this site and am in dire need of help. I have just done a 2.3 to 5.0 conversion. I think I may have messed up on my choice for ECM and wiring harness. I swapped a 5.0 out of a 90' LX completewith ECM and engine harness into a 92' 2.3 LX, My problem is that i get basic power to the ignition (lights work, turn signals, Heater fan, etc.) however turning the key to the "On" posistion..the fuel pump does not prime,, then the key over to crank the motor..nothing happens. In addition when I turn my head lights on the horn blows along with the lights turning on. Guys I need some serious help on this one!!! Thanks in advance

April 25th, 2008, 03:09 AM	#2
FoxHoss Enthusiast 02' GT Join Date: Oct 2007 Location: Brooklyn, CT Posts: 592	oh gosh, im doing this swap rite now, an 89 to an 89 tho... im swapping the ECM and related harness in the next day or so, hope you find hte problem. let me know if you find the problem so i dont go down the same path, good luck bro __________________ Nitrous is like a hot girl with an STD... you wanna hit it, but your afraid of the consequences '02 GT~dd '89 LX~still in swap mode '95 S-ten 4x4~winter beater

April 25th, 2008, 06:18 AM	#3
e3sean MM Fanatic 1988 lx 5.7 11.6@109 Join Date: Nov 2007 Location: arizona Posts: 3,575	change the relay that is next to the computer. make sure the computer harness has a good ground. i just had the same symptoms and it was the ecu harness main relay next to the ecu __________________ the only thing u will be burning by going with a 347 insted of a 331 is the guy driving the 331 MILITARY CREW USAF LUKE AFB AZ, E-5 SELECT 7995 AMMO I.Y.A.A.Y.A.S

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April 25th, 2008, 08:41 AM	#4
samstigg Newbie 1992 Mustang LX Join Date: Feb 2008 Location: Eastern Shore, VA Posts: 5	Ithink you will be fine, using 89' to 89'. I think part of my problem might be the fact that I have a 92' an used the ECM and Harness from a 90', things changed a little between those years. I will check the power relay, it was swapped out in with the 90' haress, but maybe it was bad to begin with. any other ideas just in case??? what about the fuel relay??

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