the other day my 1992 f150 5.0 started acting up. black smoke comeing out of tail pipes and engien sounding like it was ideling rough. when reving moter it would sound like it was flouding out. my step dad has been working on ity but were about out of ideals. so far he has replaced, map sensor,O2 sensor,fuil pressure regulator,cap&roter,spark plugs, only thing else he can think of is throtle positioning sensor. he has also checked fusse's. there is no knock or other such loud noise. only performnce mod's were true duil exaust and a K&N filter all of with have been on for a number of years. filter was clean. please any advice.

fuil pump runs non stop getting to much fuil.

 

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Temp. sensor to EEC, pull the wires off and see what happens. I think I read someplace that will act the opposite with the wires off. But it sounds like the one to look at anyway.

 

I have to ask: did you pull the codes? Has he just been replacing these things be cause he hopes that he will hit the right one eventually and fix the problem, or did the codes point him in that direction?

You can throw a lot of money away in a hurry replacing parts that don't need to be replaced. Pull the codes, and see where that points you. You can buy a code scanner pretty cheap, about 30 bucks, or you can get them checked for free at many auto parts strores.

Thing to remember is, just because a code shows up that points to a certain sensor, that doesn't mean the sensor itself is bad. A good repair manual will give you info on how to test the sensor, and it can even be soemthing as simple as a loose or dirty electrical connection, or something associated with that sensor that is causing the problem.

Pull the codes and save some headaches.
Also, check the fuel pressure. Fuel pressure problems won't generally throw any codes, but can cause the problems you describe. Usually, the problem seems to be low fuel pressure causing a starvation problem, but high fuel pressure can cause the balck smoke you described. Changing the FP regulator was a good move there, but the pressure should have been checked first, and then again afterwards.

I think subford is on the right track with his suggestion as well. If the temp sensor is bad, it will basically be telling the computer that the engine is always cold and it will keep it running rich. Does it run like this right from cold start, or is it just after it warms up? It's possible that the engine is so loaded up by this time that it will run like crap at all times, cold or warm.