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#Low boost and hissing noise at Idle/low rpms

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 Post subject: Low boost and hissing noise at Idle/low rpms
PostPosted: Wed Apr 19, 2017 8:00 pm 
In Neutral
Joined: Tue Jan 03, 2017 6:28 am
Posts: 1
I have a bit of a problem with my 94 ej22t wagon. I lent it to a friend and when I got it back it was making no more than 5 lbs boost (it was making 15 before,) and it makes a slight hissing noise at idle and lower revs, past around 5k it goes way. Any ideas what it could be? I checked for a boost/vacuum leak with soapy water and carb cleaner and found nothing. maybe an exhaust leak pre turbo? Thanks!!


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 Post subject: Re: Low boost and hissing noise at Idle/low rpms
PostPosted: Thu Apr 20, 2017 5:20 pm 
Site Admin
Site Admin
Joined: Tue Oct 15, 2002 11:37 am
Posts: 27020
Location: Houston, Tx
Welcome to the BBS.

Do you have any modifications done to the engine/car?

It sounds like you're just getting wastegate boost and the boost controller isn't working. I'd check to make sure all the vacuum lines are hooked up properly and there's no debris in them. You can review the vacuum/boost diagram in the link below.

http://surrealmirage.com/vrg3/vacuum/

The other thing you may want to do is check the ECU for codes to see if the electronic part of the boost control solenoid is out of spec. You can also check the resistance of the solenoid to see if it's ok.

The factory manual has diagnostic info & how to check the codes in section 2-7.

http://www.main.experiencetherave.com/s ... and_Elect/

_________________
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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