I.a.c.v

cruisen_15 · #1 10-02-2007, 03:43 PM

if im correct the IACV has the biggest hose to the intake, when my engine is warm i cant blow any air into this, my idle is also 100 rpm , should i be able to blow into this tube when the motor is cold?? my oil level is also pritty low, would this also cause some issues?

NikFu S. · #2 10-02-2007, 03:53 PM

Your idle is not 100rpm (1000 maybe?). I don't know about the hose. I try to keep my mouth away from the engine. Yes, low oil will cause issues but nothing to do with any hoses. I don't think you should be able to just blow air into anything unless your lungs are very powerful.

cruisen_15 · #3 10-02-2007, 03:57 PM

no literly, its like 100, it nearly is at the 0 rpm mark..... would a stuck IACV cause this bad idling and hesitation??

Nomake Wan · #4 10-02-2007, 03:59 PM

It should be around 575 which is the notch just above zero... that's what mine idles at and it runs fine...

NikFu S. · #5 10-02-2007, 04:06 PM

Quote:

Originally Posted by cruisen_15

no literly, its like 100, it nearly is at the 0 rpm mark..... would a stuck IACV cause this bad idling and hesitation??

I do not believe the car is able to idle below 500. The 0 on the tach is merely the point the engine will cut off, not an accurate reading unless it's not running. 600 is factory normal.

I think you should remove the hose and see if it is clogged, or if the pathways it leads to are clogged. I am not sure which hose you are talking about exactly. There is a large number of things that could cause symptons like this so I would not jump to any conclusions without further investigation.

cruisen_15 · #6 10-02-2007, 04:12 PM

well im not lying when i say it idels that low, after im done giving it throattle it goes down to 600 and then drops to 100 and my lights dim and the engine is about to shut off but it doesnt, it just floats there... not only that, i baught the svx used and i noticed the aicv was messed with cuzz it was missing some clamps for the hoses...

NikFu S. · #7 10-02-2007, 04:18 PM

K, well, in the meantime, why not try to clean the IACV if you haven't already.

http://http://www.subaru-svx.net/pho...p?How-To|14338

I'm not sure which clamps you mean. I do not recall any clamps on any air hoses.

In your original post "biggest hose to the intake" threw me off. You mean throttle body right? There are two other hoses connected to the intake which are both longer and of similar circumference that connect to the PCCV.

cruisen_15 · #8 10-02-2007, 04:27 PM

as biggest hose to the intake i ment the thickest hose to the black intake box, and your link doesnt work

NikFu S. · #9 10-02-2007, 04:31 PM

Strange. Go here http://www.subaru-svx.net/photos/user.php?How-To

Click on engine, then throttle body for instructions on cleaning the TB and IACV. I think you need MS Word to open it. I cannot view it so I do not know what it says.
I also do not have my SVX anywhere near me so I cannot go look at which hose is the biggest. :/

After we determine the IACV is or is not the culprit we can go on to diagnose the problem further.

cruisen_15 · #10 10-02-2007, 04:48 PM

thanks for the help u know... but that link of doc. didnt really help me, but i did get other good stuff from it...

cruisen_15 · #11 10-02-2007, 06:19 PM

im getting pools of oil under my intake manifold, its under a brass saucer, not exactly sure what it is and i cant get a picture of it, its right under the "ball" that connects each side of the intake manifold, kinda behind the pcv valve..

NikFu S. · #12 10-02-2007, 06:24 PM

I believe that is the oil sending unit and mine has been replaced at least once.

crazyhorse · #13 10-02-2007, 06:30 PM

Would that be the IRIS valve?
If you're getting oil there, you have a PCV malfunction. Most likely your IAC & throttle body are both gummed up with oil. Check your PCV valve, pull it & shake it, it should rattle. If it doesn't, replace it.
Somewhere above that there should be some sort of filter. I'm betting it's missing, or broken. That will allow the oil into the manifold. Once there the oil will gum up & wreak havoc with all the small idle passages.
A "quickie" check would be to pull the intake hose. If there's oil in there, you can bet the PCV system isn't properly doing it's job.

Take some of this with a grain of salt, as I really don't have any experience with SVXi These are just general rules of thumb for automotive work.

NikFu S. · #14 10-02-2007, 06:35 PM

IRIS valve is within the manifold. Under the manifold is a small brass colored object near the front with hoses coming out of and going into the sides.

That "ball" is the IRIS valve.

cruisen_15 · #15 10-02-2007, 07:05 PM

ok well i know my pcv valve is good cuzz i took the stock one of any it was just fine but i put a new one on anyway, lots of grum and grime in the old one but it still made the ring when u shook it... i looked at the iris thingy and there is dropplets of oil clinging from it, also almost any hose that ive tooken off had grime and gunk in it, i did clean them BTW, i also have a large leak but i cant find any seal or gasket bad and there oil spills running down the top of the engine so i guess its probly this iris thing...