Throwback:
http://vb.foureyedpride.com/showthre...ercury-Capri-L
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With the mechanical side of the engine bay wrapped up it was time to get my wiring game on. I had a partial harness from the F250 the block came out of, and the chopped up harness form the 94 mustang that my T4M0 came out of. Using these two harnesses, and a wiring diagram (and many beers) I decided I would make my own custom harness and run each wire that I needed. I deleted a bunch of systems from the harness so I figured this would keep it neat and concise.
With my wiring harness completed, it was time to turn this bad Charlie over and see what I got for spark/signals. “Crank, Crank, GRIND!”… My starter motor sounded like garbage. After extensive measurements on the starter motor and bell housing I determined that something was not right. Some more research proved that I had the “short snout” starter motor rather than the “long snout” motor. This made all the difference. Once the new motor (Wilson 91-02-5846) was installed I was cranking like a champ. Upon first attempt I had great looking spark…CHECK!
Next up was the injector pulses…not so lucky. I was seeing 8 pulses / rev of the motor which told me something was wrong. Long story short, I had the O2 sensors wired incorrectly and I was feeding my signal return wire 12v.
The old 94/95 O2 harness confusion resulting in voltage at pin #46. I did NOT fry my ECM after this mistake. Simple rewire and boom! I had great looking injector pulses.
With these pulses I was able to get the motor to limp along (barley) which had me beaming with excitement. Again, stock ECM, 60# injectors, 24# calibrated MAF… car ran like a big bag of poo. BUT running none the less.
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