jono20

reading over Kevins emmissions removal guide again, I came accross this picture:



I see hes capped off the fuel injector air bleeders (or so I thought they were...)

is this an ok thing to do? I heard they were supposed to be vented to a fresh air source (between AFM and TB), and was dreading having to run another vacuum line, and ive got a CAI so id have to tap a hole into my piping.. whcih would suck..

ANYWAYS! can I eliminate these lines? jsut cap em off like landers did? pleaseee say yes.

thanks guys.

Hellkat

is that a third fuel rail?? those injectors are right next to the BAC????

Syonyk

The TII manifolds are kind of backwards compared to the NA ones - I believe that's a picture of a TII manifold.

You can block off the air bleeds, though it may have some effect on your idle/low RPM performance.

-=Russ=-

NZConvertible

The fuel injector air bleeds are there to make the engine run more efficiently by improving fuel atomisation. There's no good reason to remove them. You don't have to tap any holes anywhere, you just connect them back up to the appropriate nipples on the UIM like they were.

jono20

Im concerned about the other side of the hose.

stock, there is a hose that runs off the intake piping between the MAF and TB, and the injector bleeds run to this.

With a cold air intake, I no longer have those stock attatchments, and dont really want to drill holes into the intake piping.

can the lines run to vacuum anytwhere instead?

RETed

The air bleed valves help idle quality significantly for the primary fuel injectors.
I would never recommend to remove them under the primary fuel injectors.

On the secondary fuel injectors (as seen in the pic), they do absolutely nothing.
By the time the secondary fuel injectors kick in (at around 4,000RPM), the airflow is moving to rapidly, that atomization is a moot point for the secondary fuel injectors.

If you do remove them (from the secondaries), be aware that the fuel injectors do sit "into" the tops of the air bleed valves, making for easier positioning of the fuel injectors.
So they do have their uses.


-Ted

jono20

couple I remove the hose and cap the nipples for the secondary air bleeds without removing the diffuser plate?
and does anyone know of any nipple on the manifolds that sucks air from before the plate in the TB? like I said, ive got a cai so no stop tubes coming off the flexi-intake.
1990 n/a

thanks again

RETed

That's fine.


Sorry I can't help you further; I don't work on too many of those.


-Ted

NZConvertible

It's not vacuum, it's air from in front of the throttles. If you don't take it from somewhere between the AFM and TB the engine will suck in unmetered air and act like it has an air leak.

jono20

yeah exactly. are there any nipples off of the tb that feed from air that comes in b4 the plates?

jono20

anybody know? or am i stuck tapping into my intake

HAILERS

Idle the car. Pull one hose off a nipple at a time. Feel for vacuum or the lack of. Done.

jono20

I dont have an engine atm, after it gets back from the rebuild I need to be able to get it back together as fast as possible, so I was hoping someone would know of one of these nipples, if they exist...

jono20

alright I dont want to start a flame war so dont argue with me, im simply posting this in case this thread is dug up through a search:

after talking to Landers, he informed me that HE hasn't noticed and negative effects from blocking off both bleeders. he's sure it makes a difference, but it's not noticible in eveyr day driving.

if your having the same perdicament, I say block off both and run it. if its idleing beyond crappily and you cant stand the low end, quickly run the hose up to a fresh air source and see if theres a diff.