Do I need to repin the harness? October 17, 2005, 02:01:43 PM Doin the mass air conversion with the parts upgrades I plan on starting tomorrow. Browsing through coolcats I found this:QuotePROCEDURE & NOTESWith the mass air computer you will need to reroute 2 wires in the wiring harness that goes to the computer. This controls the open and closing of the Thermactor air system, driven by the air pump. Fresh air is directed into the cylinder heads and the exhaust system for cleaner burning. If the system does not operate correctly, you may experience hesitation and increased emissions. There are 60 pin locations in the stock EEC-IV computer harness. You need to switch #51 to position #38, and #11 to position #32. The reason you need to switch the wires is due to the differences between the stock Cougar and the stock Mustang computers and harnesses. You may also need to run a new wire to the fuel pump relay. In the Mustang, there is a secondary fuel pump monitor wire that runs from pin #19 on the computer to the fuel pump relay. It's basically a double-check to make sure there is sufficient power running to the fuel pump. If you do not run the wire you will get a code 95 (secondary fuel pump failure) when a computer (EEC) test is performed. It doesn't mean your fuel pump isn't running or working properly, just that the back-up check doesn't acknowledge it. It's up to you whether or not to run this wire. I'm using my stock 87 Cougar harness with the new C3W1 Computer.I'm assuming this means I have to re-pin these particular items, correct? Quote Selected
Do I need to repin the harness? Reply #1 – October 17, 2005, 02:26:51 PM Yes you should move the terminals.. If you have some spare EEC terminals they can be added to positions #38 & #32 and then spliced into #51 & #11. Thats how mine is and there has never been a problem. As stated the connection to pin #19 is optional, but I'd connect it to keep from getting a fault code.BTW the Mass Air conversion from Ford Racing states nothing about moving or adding any connections(I have the paperwork). When I got the Blue 5.0 with the FR kit installed, it was full of codes because none of the wiring changes had been made. Quote Selected
Do I need to repin the harness? Reply #2 – October 17, 2005, 02:48:54 PM QuoteBTW the Mass Air conversion from Ford Racing states nothing about moving or adding any connections(I have the paperwork). When I got the Blue 5.0 with the FR kit installed, it was full of codes because none of the wiring changes had been made.I noticed that same thing as well..... Is the re-pin due to the harnesses (cougar to mustang)being different or was this a change to the ECM that was made after speed density was phased out? Quote Selected
Do I need to repin the harness? Reply #3 – October 17, 2005, 03:55:27 PM The re-pin is due to the EEC pin out being different from SD to MA. The same changes are necessary on a Mustang.. Quote Selected
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