[img=http://img67.imageshack.us/img67/1936/enginebay2hh4.th.png]
so i got my engine back together and i realized that i was missing this, i was wondering what is it, will my truck run ok without it or can i bypass it, and how much would expect to pay a junkyard for one?

note:this is not my engine bay, thanks to 4crawler for the pic

 

That is a canneauter valve. You don't want to be driving around without that thing.

 

it is supposed to hook up with the fuel pressure regulator and manifold vacuum right?

 

so my instructor said it would be ok to bypass it so we did and i started it up and it runs ok, but needs a bit more tuning and stuff. right now its running straight off my new lce headers with the o2 sensor just hanging in my engine bay. but i noticed that while its idling, at about 1200 rpm it will drop down to ~800 then come right back up periodically. is this just because the idle is set too high or is there some other reason?

 

elaborate please.

 

I cant say what exactly what it is, but I do know that 22re efi's are real temperentle. So I would save yourself the headache and go get one. It cant be much at a junkyard, probably $10 at the most. It will most likely take care of your idle issue.

 

another question, right now i have my o2 sensor hanging off my master cylinder i know this isnt good but i have to wait till next paycheck to get a spot for it and to have my exaust welded up, but my question is are there any problems that i could cause by running my truck like this?

 

its a VSV (vacumm switching valve) I can't tell what its hooked to on yours thanks to all the RED HOSES! maybe an EGR vacumm modulator. ? sorry I'm not too schooled on 22rec's

 

hook----line------sinker

 

so i have it figured out what it is and it hooks up to the fuel pressure regulator and the intake, i should be getting one from a junkyard pretty soon. but what about my o2 sensor?