Paulieflyer2

I recently replaced injector O rings due to a fuel leak, now it idles rough and blows black soot out of the exhaust,at idle.It also has super bad gas mileage,I may have mixed up some of the vacume lines,can you mix up the injector plugs,do you need the clips to hold the boot in place

Abovetimberline

i assume it is a 4.0,what year is it? it is hard to mix up the injector electrical wires but it can happen,the metal clip is not needed but should be there. I would look at your vacuum lines,it sounds like you have a vacuum leak. Knowing the year will help.

Paulieflyer2

I am shure That some of the vacume lines are not right,it is a 1990 there are no leaks that I can tell,I am at witts end and could really use some help I took off all the injectors and put everything on right,it still idles rough and has very POOR fuel economy,there is black soot on the plugs and on the exhaust pipe and it smell rich,very rich Thanks Paul

Mike1998XJ

Post a pic or two of your vac lines.
Mike

Paulieflyer2

I am pretty shure it is the sensor next to the TPS I double checked the vacume lines they seem to be OK

QuoteWarz

It could definitely be some of the vacuum lines near the throttle body or TPS.

Black88XJ

I'm having the same problem here, wondering if you found a fix?

Thanks,
Collin

JeepCherokeeNewb

Your exhaust is black and probably smells like gas because its missing.
Check your injector connections, make sure they are in the right order.
You may have also plugged or damaged a tip when you pulled/replaced them.
Good tip is to soak em in injector cleaner before they go back in.

After you get that taken care of check your plugs. They're probably coated with crap, and if you've run it like that for long check your o2 sensor as well.

Hope this helps.

Also, I always tape and number plugs and injectors when I pull em... I know, Newb right. Haha

Paulieflyer2

I replaced The Idle Air Control Valve I runs like new now, Thanks for all the help Paul

ken72

Thats good to know... where is the Idle Air Control Valve?

Paulieflyer2

It is located on the throttle body next to the throttle position sensor,I think only the 1987 to 1990 have this part

Soldat

I have a 2000 and it has the IAT sensor.