well i have done almost everything to make the car not have a vacuum leak, here i will list what i have done

replace all vacuum lines
replace UIM, dynamic chamber and TB
replace all vacuum lines (again)
get a new spyder vacuum line connecter to all the oil injectors
replaced gasket from UIM to LIM
replaced gasket from LIM to engine

then i started to look around and found that alot of guys are removing the entire vacuum rats nets, because it is for emissions

removed all metal lines that connect vacuum lines
capped of all fo the non-used vacuum ****
removed all solinoids
blocked off my egr valve
blocked off acv

and some other stuff that i cant think of...

so with no, or very little amount of vacuum lines in my engine there should be not a singe leak... but there frikken is.

the sound is comming from under the UIM near the primary injectors. and the only points of vacuum ther are the oil injectors and the nub that is on the engine. all have been checked and re-checked and still i have it.

what can it be???
i am pretty sure it isnt the Pulsation dampiner becasue if that was cracked there would be fuel squirting
it isnt the fuel pressure regulator, becasue that is on the secondary fuel line and the sound isnt coming from up that high.

what could it be??

 

what year/type of car?

 

profile says s4 n/a gtu trim

EDIT: Wow.. I remember when someone being born in 1985 instantly meant they were some imcompetent highschool noob, im getting older :/

EDIT FOR CONTENT: When you replaced the gaskets, did you mill the 17yr old gasket aspestos crap off? Generaly those old gasets form into becoming part of the manifolds. You might even think its part of the manny until you try to scrape/gouge it with a scraper. If you didn't mill/ grind the old manifolds gaskets off, this can definately cause a *HUGE* vac leak. Even if you did put new gakets in, if they didn't have a smooth manifold surface to set on, they will leak.

 

what about the fuel injector grommets where the injectors sit onto the intake ... that's a vac leak source right there.

If you're at wits end finding the exact source, you could always pressurize the whole intake and find your leak that way more easily.

hugues-

 

fuel rail should hold the gromets sealed, unless the gromets are falling apart or something.

 

If those air bleeds have cracked apart, there's nothing to support the grommet anymore, that might be something to check.

 

of course i sanded off all of the excess gasket on the manafolds...


my primary injector gromets have not been replaced, and from what i can tell they are hard as a rock.

 

check teh TB stop screw to see that the tb plates are open to fsm spec at no throttle... They shouldn't be open much

 

Lol, that's the problem- they get "hard as a rock", and quit sealing like they're supposed to...You should have looked at them when you had the UIM off...

 

yea... there was soo much other stuff that i took off, looked at cleaned, and what not that i hav ejust forgot about them.

they should be here tuesday