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Old 07-28-2013, 04:43 PM   #1
smithrcing17
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Member#: 193195
Join Date: Nov 2008
Chapter/Region: Tri-State
Location: Harrisburg
Vehicle:
2005 Ty Tuned 2.5RS
PSM

Default Low idle and low vac pressure somebody please help

I bought this car a month ago and it's always seemed sluggish and had a low idle when I got the car (500rpm) so I figured from day 1 that I had a boost leak or vac line tear. I put a k&n filter on and tbe. Took off the intercooler and replaced the rear y pipe gaskets, bov gasket, put on low mileage sti diverte valve.... Also have Cobb ap stage 2 map on the car....

I went into the boost live data on my ap and at idle I have -8 vac pressure??? Idle is still at 500 rpm, it should be near 750 and I'm guessing its because be vac leak, so I've spent 3 hours today with my boost leak tester and squirt bottle spraying every hose, every connection, every gasket, capping off lines, adding clamps to lines, trying everything I ****ing know to do and can't find anything


When I put air into the intake it fills up and I can't hear air leaking or see bubbles anywhere and then when I try to put my tire pressure gauge on the valve stem on my tester there is no pressure there. Won't even pick up 1psi, but when I push the valve stem with my finger the air rushes out so I know there is still some air pressure in there. Also the black purge valve that comes off the intake and the intake manifold and then goes down under the intake manifold.... It will start to make a squealing noise after about 20 seconds with the air hose connected to the cap. Then as soon as I pull the hose off the noise stops.

Also when I'm driving and I go into boost i can hold 13 psi consistently.. It doesn't taper off or jump its steady boost but I cannot figure out wtf is going on with vac pressure, also guessing with my low idle and bad Vac pressure that its throwing off my timing and being the reason it runs like ****... (Very laggy down low)

Also replaced crank angle sensor today as well as another thing to write off my list, could it be bad iacv gasket???
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Old 07-28-2013, 05:32 PM   #2
SkullV
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Member#: 357798
Join Date: May 2013
Chapter/Region: MWSOC
Location: Chicago, IL
Vehicle:
2003 WRX
WRB

Default

Could be bad IACV gasket, or dirty sticking IACV. What does your vacuum data show when you are coasting in gear?

Around here it's $40 to get a smoke tester hooked up to check for leaks. I built my own, but after using it once, I will never sit there with a spray bottle of soapy water, brake clean, etc. ever again. So worth it to find all your leaks in 10 minutes.
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Old 07-28-2013, 05:42 PM   #3
2gnt2wrx
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Join Date: Aug 2006
Chapter/Region: MWSOC
Location: Waukesha, WI
Vehicle:
2002 wrx
wrb stg2

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Op needs to search for the boost leak test diy on here. You need to plug a couple of those vacuum lines, Including the kazoo line which you are hearing.
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Old 07-28-2013, 05:49 PM   #4
Andrewxxcarlson
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Location: Elk Grove, CA
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2006 WRX
WRB

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Shouldn't the purge valve squealing tell you that air is leaking from it?...

I didn't seal it off when finding my leaks, never squealed.
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Old 07-28-2013, 06:27 PM   #5
2gnt2wrx
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Vehicle:
2002 wrx
wrb stg2

Default

Quote:
Originally Posted by Andrewxxcarlson
Shouldn't the purge valve squealing tell you that air is leaking from it?...

I didn't seal it off when finding my leaks, never squealed.
It has squealed on all four Subaru's I have owned.
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Old 07-28-2013, 07:15 PM   #6
smithrcing17
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Join Date: Nov 2008
Chapter/Region: Tri-State
Location: Harrisburg
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2005 Ty Tuned 2.5RS
PSM

Default

Quote:
Originally Posted by 2gnt2wrx View Post
Op needs to search for the boost leak test diy on here. You need to plug a couple of those vacuum lines, Including the kazoo line which you are hearing.
I have searched and did look at the boost leak test threads.... I'm not looking for a boost leak, if you read what I said, I have a vacuum leak, hence why I left the like plugged into the intake so I could find which line had a hole in it, I traced it back to the big 1/2 line that goes down under the radiator top reservoir and goes into the top of the block. I'm going to replace the gasket tomorrow and try again
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