On your 87 XJ the MAP sensor vac line plugs right into the inboard side of your throttle body. Another thing you can do which sounds like it might help you out is Remove your IAC from your throttle body and thoroughly clean it and the bore that it fits into. Also verify it is getting the proper voltage from the ECU. Also just do a thorough check all around your throttle body/intake manifild area for any other loose, cracked or missing vacuum lines. The way you say your Jeep is running, it sounds like it has a massive vacuum leak.

 

I got the line plugged into the little tree in the intake,there is 3 male ends on it thats where i plugged it in to is that right?

 

I don't know if that is the right spot or not, but it is a source for vacuum so you should be good. To your previous question, vacuum is just as the name implies, it is going to be a sucking force, just like a vacuum cleaner. Anything, more or less, dealing with pressure is going to be a blowing force.

 

Well I tried another map sensor now with the map vac line plugged into the vac port on the intake it won't idle if you leave the vac line unplugged it will idle but still runs very rich.

 

 

After freedgr's last comment I went back to re-read the thread thinking maybe something was missed. Earlier in the thread you said that the smoke was blue and then said it was fuel smoke. Did you verify that the smoke was indeed not blue, or white but in fact is black (we hope)?

 

Leave the poor jeep alone its old enough to smoke lol

 

Yea its black I got my buddy to stand back there while I reved it up to make sure of the color.

 

im going timing.. backfiring, runs rough, smokes.. sounds like timing/possible valve problem. check distributor timing.. I agree valve guide seals prob hard and leaking oil into cylinder

 

The attached post, and the post right before this one are probably going to be good places to start in my opinion. Go through if you haven't allready and check to for any vacuum leaks, make sure sensors are in working order, check the timing, clean the throtle body and Idle Air Control Valve, go through and check for general working order and condition of things under the hood. If all else fails then pop the valve cover and do your seals. I don't know though, I would think that if your valve guide seals were kaput, then you would be seeing oil smoke and not fuel smoke, who knows maybe not. But at least by going through and checking things out you will be able to eliminate certain variables from the equation.

 

has to have vacuum

 

It has vacume now,but the thing won't idle with the map sensor vac. line plugged into anything with vacume.It starts right up revs kinda high for a sec. then just kinda dies out,if you give it some gas it dies right then.

 

all the vacumm lines are good black smoke means its running to rich