Thread: Vaccum issue?

Ok i swapped a 99gtp motor and pcm into my 98gt
everything is tits i believe but i think im having some vaccum issues,I get lopey idle and a lean bank1 code.
Now idk if this is right or not but it has seemed to work...lol
i plugged the hose that controls my interior ac controls,to the middle
of the vaccum tree is that correct? If im not mistaken i thought somthing was supposed to see atmosphere pressure or is that just for swaps with the gt pcm?
Also everythime i got to get gas and remove the cap pump my life away,then go to start it,it runs horribly for a few seconds very bad up and down idle then clears out?
seems to have weak power

Originally Posted by Sl33p3rGt

Ok i swapped a 99gtp motor and pcm into my 98gt
everything is tits i believe but i think im having some vaccum issues,I get lopey idle and a lean bank1 code.

Classic symptoms of a vac leak.

Originally Posted by Sl33p3rGt

Now idk if this is right or not but it has seemed to work...lol
i plugged the hose that controls my interior ac controls,to the middle
of the vaccum tree is that correct? If im not mistaken i thought somthing was supposed to see atmosphere pressure or is that just for swaps with the gt pcm?

Don't know about the connection but just cap the tree as a test.

Originally Posted by Sl33p3rGt

Also everythime i got to get gas and remove the cap pump my life away,then go to start it,it runs horribly for a few seconds very bad up and down idle then clears out? seems to have weak power

Be sure not to over fill. If you can afford to fill up these days. lol

Vac and fuel pressure are were I would start.

ah nice...blocked it off seems to be idleing nice now thanx.
I bet having that hooked up to the ac control vac,was just enough to keep it running decent with a vac leak...lol
appreciate the help

Or the vac leak is on the AC side.

Yeah it seems to be running way better now,i just plugged it and the idle issues went away,along with loss of power.Thanks again