Was fooling around trying to pull codes. Never did happen, but I finally crossed something up & now won't start at all. "87 Cougar, 3.8 CFI, EEC = MP. Swapped in EEC from my 3.8 MN12 = X2S2. The 87 now starts, buts idles like . I think the poor idle would be normal considering that the X2S2 thinks it is firing 3 fuel injectors instead of 1. I have a new EEC ordered, but would feel a lot better if someone else thought the same as I.
Thanks Bill
wow I'm surprised that even works. Also that mn-12 comp may be a mass air comp.
I'm surprised it runs as well...
Installed reman EEC. Fired right up.
In the spirit of what I think this board is about, here is what I think I did. I had the STI and Sig-Rtn leads jumpered with a long piece of 10 guage wire, & was trying to read codes with a voltmeter between STO and the + Bat terminal. After I could hear the fuel pump stop priming, STO would just go to ground and stay there. Some instructions don't say anything about Sig-Rtn. They just say to ground STI. So at this point I placed my head firmly up my A** and moved the wrong end of my jumper to the neg. bat, terminal. Instead of grounding STI, I grounded Sig-Rtn. Maybe since I was operating in the HUA mode at this time I placed the jumper on the + bat post, but I think it was the negative.
As far as using the wrong EEC to test with, from what I read it doesn't take much to get EEC-IV to fire the injectors in the Crank or Start mode. I wasn't surprised that the wrong computer would start the car, but I also wasn't surprised when it ran like .