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Computer help! Mustang/Lincoln problem
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Posted by: drewrain

ok, so here's the deal: i started out with a 93 mustang with a 4 cyl. I recently found a 90 lincoln towncar with a 5.0 (not HO). I took that 5.0 out, put a new bellhousing and Borg Warner T-5 behind it. the problem with it now is it is running so rich that it is killing itself. i can tell that the engine has run rich for a long time because of the exhaust pipes, and the fact that it smoked (like it was rich) and that smell of unburnt gas that it gave off before i took it out of the lincoln. I can turn the fuel pump off and after a few seconds it starts running smoothly and the dark smoke goes away, until it runs out of fuel in the rails. I changed the upper intake and fuel injectors (incase the intake was clogged, and the injectors incase they were stuck open), but that had no effect. The O2 sensors are working properly, and i even tried tricking the computer into thinking it was getting the 14.7 ratio, but that didn't do anything. I am thinking that the computer is causing the problem, but i don't know. If it is, can i use a mustang computer (or any other ford from the same year range for that matter), or does it need to be a lincoln (and if so, does it have to be the EXACT one)? If i can use different ones which ones do you know will work? Thank you guys in advance!

Andrew

Posted by: VETTKLR

faulty O2 sensors?

Posted by: GMR

Have you checked the fuel pressure and the fuel pressure regulator?

LS

Posted by: drewrain

the o2 sensors are fine. i checked them manually with a DVM and they outputs are exactally where they should be for the temps that it went through. I also tricked the computer with about .45 volts (what the sensors put out when there is a 14.7 ratio.

regarding the fuel pressure: i changed the fuel pressure regulator and there was NO difference. I tried it with different vac levels, with no change.

i was able to find a computer from a 90 lincoln TC for $25 so i picked that up, but even after putting that in, it is the same exact story.

i also put an o-scope and DVM on the injector outputs from the computer and the frequencies are where they need to be. I thought that the injector harness could be shorting out and causing the injectors to stick, but i tried each of them manually from the computer harness and they all reacted as they should.

i know that it has to be in the fuel delivery system...somewhere; but this is just tripping me up.

Any help would be most appreciated!

Thanks guys.....Andrew

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