How about spraying carb cleaner?

EGR hanging open?

 

No egr, I've sprayed carb cleaner everywhere I can think to and haven't noticed a change.

 

What does this leave us with?

Where else could air get by????

 

I have no clue. I'm about ready to just sell the dang thing.

 

Where could air get by internally and not be detected by spraying carb cleaner?

The EGR and what?????

 

The egr which is gone, any vacuum lines which might have a leak else where, but this isn't an option since I've capped every vacuum line with no change in idle, and the throttle body which I've adjusted the screw where I let it all the way out and then turned it back till I saw it barely barely move.

 

Turn that stop screw with it running?

Throttle blade actually closing fully? centered? Take it off and hold it up to the light and see.

 

It's on the bottom of the TB and I don't think I could get an Allen in there with it attached to the jeep. I've held it up and there is barely a sliver of light, you might could fit a piece of paper in the gap. I pulled the o2 sensor out to send it back and the REM is reading 5v with the sensor unplugged. Is that the default, or is there a short somewhere I need to find?

 

Got the new o2 sensor in and it's swinging correctly and the idle is a little smoother and a little lower. I'm headed out of town for the end of the week, but when I get back I'll try swapping the throttle body off another Jeep to see if it idles better

 

Swapped the TB and she's running good now. Idles right

 

whooda thunk it?

 

I had tried adjusting it and everything. It looked good, but I guess air can find gaps the eye can't see.

 

False alarm. Drove it back to school and now it's idling high again with the stock TB on it

On the bright side though the new o2 sensor was swinging perfectly and it stayed in closed loop the whole way back.

 

I swapped the map, iac and TB from the other Cherokee with no change.

 

I read the thread some time ago but I dont remember all of the details. The first thing that comes to mind in recent reading is to look at the EGR system removal. Is there a block off plate? How was it sealed? Is air getting by the block off somehow? How about a cracked intake manifold? I am assuming when the stock throttle body went back on, it has its own idle air control valve, etc? or was that switched from the throttle body taken off? New throttle body base gasket each time?