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Old 03-24-2004, 11:02 PM   #1
Scooby Specialist
Member#: 6218
Join Date: Apr 2001
Chapter/Region: SCIC
Location: Agoura, California
2001 2.5rs-t
silverthorn metallic

Default Problem with vacuum

Yesterday I had a vacuum leak from the hose that goes to my boost gauge. This is like the fifth time this has happend where the hose cracks where it connects to the rest of the hoses. I cut off the bad part and reattached it. When it leaks it usually reads about 10inHg and when solid 20inHg. Well after fixing the hose my boost gauge is reading like 18 inHg, with my foot off the gas, for the first 10 minutes or so then drops down to 20inHg. The only thing i can think of is that the pistons are heating up and making a tighter seal in the cylinder which would cause more vaccum but as far as i can remember after startup the car would always stay at 20inHg. Not sure if this is too little of information but is there any other reason this would happen or is this just normal operation and i just didnt notice the gauge reading greater vacuum after driving for awhile?

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Old 03-24-2004, 11:21 PM   #2
Homemade WRX
Scooby Guru
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Mooresville, NC
96 3MI Racing LLC
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first I would suggest getting the thick walled silicon hoses...I think they are made by yakimohto or something like that
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Old 03-24-2004, 11:41 PM   #3
Scooby Specialist
Member#: 23359
Join Date: Aug 2002
Chapter/Region: NESIC
Location: San Francisco
2002 BMW M Coupe
Steel Gray


My car usually reads 15-20 when cold, then once it warms up goes to about 20-25. I think its more related to RPM though, because it idles a bit higher when cold.
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Old 03-25-2004, 03:39 AM   #4
Scooby Specialist
Member#: 32955
Join Date: Feb 2003
Chapter/Region: SCIC
Location: Pasadena, CA
'03 WRX Wagon
'89 3S-GTE Alltrac Camry


Pretty sure that's normal operation. My Camry and WRX are the same way...

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