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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » 5.0 EFI to 65 mustang conversion

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    12/03/2016 3:36 PM  #1

    roslo
    FYI FORD Member

    Offline

    From: Murphy Texas
    Registered: 11/27/2016
    Posts: 27

    5.0 EFI to 65 mustang conversion

    Im reading these things online that are telling me that if I have a manual transmission harness, I can modify the O2 harness to fit in my manual transmission however my o2 thingy is not only not attached to my main harness its hanging off the engine rn, but my plug is missing the 2 purple that EVERYBODY seems to have but me, there is not any slots for those wires either. my harness is the same in every other way though. what is even going on here. ive got a a9l computer btw

    Ya boi Ross
     

    12/03/2016 6:45 PM  #2

    Bullet Bob
    Senior 24-7 FYI Addict

    Offline

    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,896

    Re: 5.0 EFI to 65 mustang conversion

    roslo wrote:

    Im reading these things online that are telling me that if I have a manual transmission harness, I can modify the O2 harness to fit in my manual transmission however my o2 thingy is not only not attached to my main harness its hanging off the engine rn, but my plug is missing the 2 purple that EVERYBODY seems to have but me, there is not any slots for those wires either. my harness is the same in every other way though. what is even going on here. ive got a a9l computer btw

    Go to Amazon and buy Charles Probst's book, Ford Fuel Injection.  It has all the diagrams for all  of the EEC-IV systems and you can very easily modify, re-organize, customize, and re-design any EEC-IV eight cyl harness to meet your needs.  That is if you will take the time to learn to understand simple wiring diagrams  and can do simple things like cutting wire, stripping insulation, soldering, etc.

    Also, I and many others on this forum will be very happy to hold your hand....it really ain't rocket science at this level if you can read and obtain some basic understanding of how the system works, and Probst's book 'splains it very well. 

    Or...you can to to any number of "expert professional" harness makers and spend five times the $$ for something that will work but not as well as what you can do for your own self.

    Do I sound like I'm fed up?  I am in the process of helping one of our members install a "professional" harness that I know was not cheap.  I won't go into details except to say that I'm really disgusted  by some of the products that are out there.

    BB

     

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    12/10/2016 10:27 PM  #3

    MS
    Forum Originator

    Offline

    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,349

    Re: 5.0 EFI to 65 mustang conversion

    Roslo, I understand Bullet's frustration. He probably knows more about EFI wiring than anyone. His advice to get Probst's book is very good. I know you are just starting out with this stuff, and you surely get all the help you want at home, but the experts here can be your best ally in getting the job completed.
    Sometimes describing the issue is half the battle. Try to explain explicitly the problem you are experiencing to get the best response.

    I have gone through the EFI experience on two different cars and now know I want nothing to do with it on classic Mustangs.   But I do respect those who want to get that experience themselves.

    So, persevere.  But buying that book and learning how to follow a wiring diagram will help alot.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    12/11/2016 12:15 PM  #4

    Bullet Bob
    Senior 24-7 FYI Addict

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    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,896

    Re: 5.0 EFI to 65 mustang conversion

    Roslo,  sorry if it sounded like I was upset with you...absolutely not true.  I'm just fed up with so called experts that sell expensive stuff that only barely gets the job done.  I do feel that the book will provide a good basic knowledge that will help a lot.

    BB

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    12/12/2016 7:03 PM  #5

    Jeff in GA
    FYI Addict

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    From: San Luis Obispo, CA
    Registered: 4/01/2013
    Posts: 209

    Re: 5.0 EFI to 65 mustang conversion

    YMMV, after initially looking at retrofitting an original harness into my car, I purchased the aftermarket harness with "RJM Technology" for about $100 less than it goes for now.

    http://www.qualityautospecialties.com/50l-efi-65-70-mustang-66-77-bronco

    Ultimately, I decided that I didn't have time for nor the interest to deal with 20-year-old connectors and all the cutting and soldering. I have not had a single issue with the harness and it works great.

    1965 Mustang 2+2 EFI
     

    12/12/2016 7:23 PM  #6

    Bullet Bob
    Senior 24-7 FYI Addict

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    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,896

    Re: 5.0 EFI to 65 mustang conversion

    I wasn't aware that the harnesses that Ryan sold were still available.  They do appear to be a pretty good value.

    BB

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    12/14/2016 3:27 PM  #7

    roslo
    FYI FORD Member

    Offline

    From: Murphy Texas
    Registered: 11/27/2016
    Posts: 27

    Re: 5.0 EFI to 65 mustang conversion

    thanks bob. we are cool.

    Ya boi Ross
       •Thread Starter
     

     

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