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Topic: Fried EEC?? Cured (Read 991 times) previous topic - next topic

Fried EEC?? Cured

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

Fried EEC?? Cured

Reply #1 –
wow I'm surprised that even works.  Also that mn-12 comp may be a mass air comp.
One 88

Fried EEC?? Cured

Reply #2 –
I'm surprised it runs as well...
2015 Mustang GT Premium - 5.0, 6-speed, Guard Green - too much awesome for one car

1988 5.0 Thunderbird :birdsmily: SOLD SEPT 11 2010: TC front clip/hood ♣ Body & paint completed Oct 2007 ♣ 3.55 TC rear end and front brakes ♣ TC interior ♣ CHE rear control arms (adjustable lowers) ♣ 2001 Bullitt springs ♣ Energy suspension poly busings ♣ Kenne Brown subframe connectors ♣ CWE engine mounts ♣ Thundercat sequential turn signals ♣ Explorer overhead console (temp/compass display) ♣ 2.25" off-road dual exhaust ♣ T-5 transmission swap completed Jan 2009 ♣
 

Fried EEC?? Cured

Reply #3 –
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 .