ok hooked up the vac guage. it read 12-15"hg and kind of hovered between the two slowly moving back and forth. when i moved the idle up manualy to 800rpm it went to 20"hg (it idles at 500rpm on it's own for some resone and)

also when looking for a vac line to tap into i noticed there was an unpluged yellow vac line in the back of the engine. it seems to go to the solinoids on the driver side of the engione and idea what it is for? know where it gois in the back of the engine?

 

The yellow vacuum lines runs from the AIR D solenoid to the AIR D part of the AIR diverter valve.

 

is there any posts on the back of the intake? becuase thats where it is just chilling the solenoid side is plugged in. (i think the engine was swapped at one point now)


i'll get a pic of it.

 

I do not understand what you are saying.
Do you want to reword the above.

 

here is where it is at the back of the enigne. so i was woundering if there are any vac posts there. i can not find any thing else it would go to.

 

It should go here in the photo below:


/

 

that seems to be MIA. would this couse a vac leak if the line is not hooked up to any thing?


actualy i just noticed the smog pump has been bypassed and is seized and there are no smog hoses at all

 

Yes it would cause a vacuum leak if the AIR D solenoid is still hooked up and active. But not all the time as the AIR D solenoid is only on when the computer thinks it should be.

 

so where are these solinoids sapose to be? i am goinf to plug the line with some thing. then see if it made a diffrence if not i will let you know

 

Just in back of the Ignition Coil. Three solenoids there, from front to rear:
EGR
TAB (AIR B)
TAD (AIR D)

 

found it i unpluged it. ran a bit better. still has 12-15"hg woundering vacuum. though


oh yah found out i had an oil filter. the whole air box was filled with oil going down the intake tubes into the TB. i unhooked it truck ran a lot better. still idles at 500rpm with low vacuum

 

Uh, that's the air filter...if there's oil in it, you have some real serious blowby. In conjunction with the low vacuum reading, I would suspect you bought a truck with a tired engine.

 

vacs only low when it idles at 450-500rpm (i hooked up a digital tach my school has) if i raise it manualy to 800rpm it's 20+"hg witch is why i am stumped to why it idles so dang low in the first place.


also with it running with the oil cap off nothing comes out. normaly with blow by it puffs out the oil fill with the cap off. (the truck is full of oil before you ask and has good oil pressure half way on the factory guage)


going to clean the TB and IAC see if that will raise the idle speed up.

 

made me laugh out loud........

 

fine air filter assembly. i just call it an air box