Thought i'd post some photos for reference purposes, Maybe someone can use them to their benefit.

I've labled certain parts A thru H, just need someone to label them correctly.

I've also added a full engine view if someone wants to add their own reference marks.

Received a lot of help from folks here, maybe this can help someone else in the future.

Thanks, Tim

 

A - Air charge temperature sensor ?
B - code reader connectors / diagnostic link connectors
C - MAP sensor
D - Idle Air Control
E - Throttle Position Sensor
F - EGR Valve
G - EGR Valve Position Sensor ?
H - Fuel Pressure Regulator

 

The top lid of my air box has 2 little "nubs" sticking out with very tiny holes on the top of them. I was wondering, what they were & what they are supposed to be hooked up to? Also I do see the your picture has what looks like a hard plastic line lying atop of the air box going to ...somewhere. What is that?
My 2.9 doesn't have an F or a G. If it does i have no idea where they would be, as I have nvr seen them b4.
P.S.
Maaaan, that is a clean engine cleaner than mine!

 

They are vacuum lines for the egr system.

I noticed at the junk yard today that some broncos do no have the egr stuff
F, the EGR valve is not there , nor the other sensors.

I'm not familiar with other year broncos or what they changed or added each year.

Mine ran without the main vacuum line to all of that stuff even connected.
No telling how long it was off.

 

The '89-up 2.9s don't have EGR systems, if I remember right. The 2 little nubs I believe are for a backfire sensor or some such -- they're closer to the engine than the fender, right? There should be a red and a green (or whatever color they may have chosen for your particular truck) plastic vacuum line connected to it... and I forget where they run without opening my hood. One goes to I believe the upper intake plenum and the other goes to the egr valve, but I can't remember for sure. There should be an emissions sticker under your hood somewhere, either on the underside of the hood or the top of the radiator core support that has a vacuum line diagram, that should give you a little more info. If the sticker isn't there, then you might be able to find it online @ autozone.com's repair guides or just Google for it.

 

the 2 nubs are on the fender side. no, big deal. i was just wondering what they went to so i could hook them up correctly to TRY to get a few more Mpg.