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  1. #76
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    I was able to make small bits of progress this weekend... I got the old 1985 wannabe PCM out, and amazingly, the bracket is the same size and fits the 93 PCM/ECU that I am installing, so that part will fit just like OEM back behind the passenger side kick panel.

    I got the garage cleaned up just enough that I can at least move around the car, so I will post some pics soon. I also picked up the following factory Ford manuals, after talking with another guy that did the same swap, and he said that the diagrams and explanations are priceless, and made it super easy. I saw some of the diagrams, and it really lays everything out perfectly, so I should be able to clean up my harnesses as well as get everything converted over pretty quick.

    Ford Mustang Capri 1985 Electrical Vacuum Troubleshooting Manual 0335-503-85
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    Ford Mustang Capri 1986 Electrical Vacuum Troubleshooting Manual
    Name:  1986mustangEVTManual.jpg
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  2. #77
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    BTW these manuals were $25 for the 1985, and $15 for the 1985 on eBay, so very reasonable.

  3. #78
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    Well, I was pleasantly surprised that the install of the fuel lines went well today. As mentioned by others, just getting the lines up next to the car gave me a good start. In the end, the key was when I saw a picture of how the lines routed at the front of the car inside of the passengers side wheel. So, I took a few pics to document the process for others.

    Here is the pic that shows how the lines routed inside of the front passenger side wheel:
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    Here is where I needed to drill an 1/8" hole and I used a stock fuel line screw to hold it to the under side of the frame rail
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    Here is a pic of how the lines come into the engine compartment
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    The following two pics show how I routed the lines along the frame rail down under the door, along side the original vapor/charcoal cannister line that was attached with a couple of rivets. I purchased new 1/4" rivets and some P clamps and secured the lines using the existing 1/4" holes.
    Name:  fuellinerouting-framerailside.jpg
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    Name:  fuellinerouting-framerailside1.jpg
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    I have a few more that I will post in the next post....

  4. #79
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    Back at the rear of the car, under the rear seats was easiest, I mounted the lines to the existing mount tabs here (that were used to secure the original carb lines):
    Name:  fuellinerouting-factorymounts1.jpg
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    Here is how the fuel filter mounted. It mounted to the original filter location for the 1985, so that was easy as well. One strange thing was that one bolt was 1/4", and one was 5/16", not sure why.
    Name:  fuellinerouting-fuelfilter.jpg
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    Here is what it looks like under the floor of the rear hatch area, I used a 1/4" rivet to hold this in as well, into an existing hole.
    Name:  fuellinerouting-underhatch.jpg
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    Here is the vapor line that is factory to the 1985, and it looks like its positioned perfectly to connect to the check valve on top of the tank. What should I connect the other end of this to (the part that comes out in the engine compartment)? I am guessing that the car had a charcoal canister originally, so curious what others have done.
    Name:  fuellinerouting-vaporline.jpg
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    Last edited by vdubn; 07-31-2017 at 12:43 AM.

  5. #80
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    Ok, so I started comparing harnesses today, and I have an 86 engine/PCM harness that comes through the firewall, and I notice that it immediately runs across the engine bay to the drivers side. My 1985 Carb harness comes out of the firewall, and splits between the headlight harness, and then runs over the drivers side.

    I was under the impression that I didn't need to remove the headlight harness, or change it over, and since I can't see where it would connect on the 86, can anyone give me some pointers on what I might be missing? Do I need to un-loom the harness that comes through the firewall, and separate the headlight section?

    Here are some pics of my 85 harness:

    First two show the harnesses as they come out of the firewall
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    Here is the leg of the harness that goes to the headlights and fogs
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    One section goes under the pass side fender to these solenoids... can I remove these from the harness?
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    Last edited by vdubn; 08-20-2017 at 02:17 AM.

  6. #81
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    Quote Originally Posted by Haystack View Post
    The only pins you really have to worry about are the o2 plugs. They are different between auto and stick and change a bit through the years. Everything else "should" line right up, color for color.
    Haystack... can you elaborate on this a bit? I found that my 86 02 sensor harness is hammered, but the 89 02 sensor harness is in great shape. I noticed the plugs on the 89 02 sensors are small pin 3-pin plugs, versus the larger pin 3 pin plugs found on the 1986 harness. I am guessing the wiring to the 02 sensors should be the same, do I just need the later model 02 sensors, or are their differences in the wiring? They are both 3 pin 02 sensors, so I'm hoping that part is simple.

  7. #82
    FEP Power Member tonysilver82's Avatar
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    You will need to source out a 86 v8 headlight harness

  8. #83
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    Quote Originally Posted by tonysilver82 View Post
    You will need to source out a 86 v8 headlight harness
    Thanks Tony, you were 100% correct. So just to document it for future folks doing this, here are the harnesses required, and why.

    - Back Half vehicle harness from an 86 GT (includes the tail lights, section for fuel pump, etc). This is obviously needed so that you can connect an electric fuel pump, but also so that you can connect the transmission harness.

    - Headlight harness from an 86 GT - This is required because in 1985 the headlight harness is a big U shape that is incorporated into the Carbureted PCM harness, exits on the passenger side of the firewall, then splits to the drivers and passengers sides of the car to the headlights and fog lights. In 1986, the headlight harness has a bunch of other component wiring built in, and exits the firewall on the drivers side, runs up to the drivers side headlight, then travels under the core support to the passengers side headlight. The fog light harness from the 1985 works without issue or modification, so no need for an 86 fog light harness.

    - Engine/PCM harness from an 86 GT - This mounts in the passengers side kick panel, connects to the PCM and the dash harness, and exits out through the passenger side of the firewall, then connects to the fuel injection harness (at the salt and pepper shakers) and also runs out to the MAF/Speed Density sensor, and some other stuff on the passenger side of the engine compartment. The other main piece that makes this unique, is the small harness that comes over the transmission hump and connects to the fuel pump harness that ties into the back harness.

    - Fuel Injection/Injector harness - This has the salt and pepper shakers as their main connections, and this harness appears to be the same from 1986 up to even 1993. I am using an 89 harness, and have a couple others from different years, and they all look the same.

    - 02 Harness - I have decided to run an 89 02 sensor harness, so that I can run the later 02 sensors. This requires some extra work and wiring that go along with the MAF harness conversion. After a ton of research, here is how you need to repin the harness to use the later 02 harness:

    Quote Originally Posted by vdubn
    Fortunately for you the same color codes where used for the same circuits in the 86 and 87-90 harnesses. So when you repin your 87 O2 harness just match up the wire colors to the ones in your 86 main harness. As I said you will only need 4 wires: GRY/YEL (16AWG), DGRN/PPL, DBLU/LGRN, BLK/LGRN. Any other wires in the 87 O2 harness should be disconnected and can be discarded.

    GRY/YEL = HEGO PWR
    DGRN/PPL = R HEGO signal
    DBLU/LGRN = L HEGO signal
    BLK/LGRN = HEGO GND
    Dash Harness - Truth is, the 1985 dash harness will work, but what really determines which harness to use, is which Heater/A/C box you ultimately run. Because my car was unique, and was a non-A/C car, it had a strange harness for the blower motor switch, so I went back and forth, and ultimately decided to swap over to a 1986 GT dash harness, and get the associated blower motor switch, and it controlled my heater-only heater box.

    I think that covers most of it. In the end, I pretty much replaced all of the harnesses in the car, except for the roof harness, and the door harnesses, but to swap it over right, I think I will be happy I went the extra bit.

    I am in the process of re-wrapping the harnesses and cleaning them all up. Then will run them through the car, and plan to hide the engine side as much as I can, under some carbon fiber inner fender panels that I am installing. We will see if the harness is long enough to reach after I hide it.
    Last edited by vdubn; 09-20-2017 at 04:00 PM.

  9. #84
    FEP Power Member Ourobos's Avatar
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    ^ Having done this a few times, I can say this is pretty damn accurate. I did use an 85 dash harness on my last 86 I converted from 2.3 to 5.0 BTW
    1986 CHP SSP Coupe

  10. #85

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    Excellent thread. And the great part is when you are done you do not have a Frankenstein wiring nightmare. Anyone with basic mechanical knowledge will be able to follow what you did. In my opinion this is the best possible way to switch a 1985 over to an 86-93 EFI setup with 89+ MAF.

    congratulations!

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