Hey guys Im having a few issues with my Version 6 STI, it is reving extremely weird up and down sounds pretty terrible. While having a look under the bonnet I have found some hoses that I can not seem to find out where they go and one is plugged up.

Here are some pics:

Cheers Danny

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the big hose plugged is from where the factory bov plum back into. The other ones is it running a after market boost controller?

No mate that ones running somewhere else im pretty terrible with this sort of thing have had my mate over to have a look, because the car sounds really rough but then found these other things so was wondering what was wrong with them. They dont seem to fit anywhere on the car.

Also has got me why the car is reving up and down like crazy stalled on me this morning and last night but tonight since ive been home doesnt sound to healthy.

put your finger on the hoses you want to know where they go and take another photo. there is a lot of hoses in those photos and they all look about right to me

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MY93 Impreza GX 1.8L, 0hp, 0nm

WHS^^

But that's not your problem.

Your Airflow Meter has died......That's what causes the up & down rev thing.

It will be going super lean too.

DO NOT TRY TO DRIVE IT ON BOOST!!!!

Borrow a known good AFM to try out to be sure.

P.s what air filter is on it?

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[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

The first thing I'd check is that the stock bypass valve return pipe is sealed properly (ie: the big pipe on your intercooler, in the bottom pic). This is used to return compressed air back into the intake on the stock setup but since you are using an atmospheric venting blow off valve, this return pipe has to be sealed. If it isn't sealed properly, air will be drawn into the intake (post AFM) causing all sorts of issues.

Otherwise, check your vacuum lines for leaks.

What boost controller are you running?

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MY99 WRX (Sold)
MY06 WRX 241hp 430nm atw (Sold)
MY09 BMW 135i 247kw atw (Current)

This is what me and me mate thought it might be. Where can I grab one to find out if its the problem?

Seems to be vacuum hoses that are off and if you have a boost controller then it could be the ones that are no longer in use! Just make sure they are blocked off. None of them should be sucking in air so if any of them are then thats a problem!
If it was an afm problem wouldn't the engine light be on? i don't know just what i thought!

What area are you in?

AFM failure doesn't throw a cel light...that's why 99-00 owners pop engines if they're not wary of the problem.

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[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

Im in Bentley mate