Low Vacuum like -10psi Idle

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Aug 3, 2009 | 03:55 PM

neoneddy

Thread Starter

Junior Member

Joined: Aug 2009

Posts: 2

Low Vacuum like -10psi Idle

I'm wondering if this is normal.. this is a 1.8t 1999 A4, I had a 99.5 A4 a few years ago, and it pulled -20 psi at idle, wondering what's up or if this is normal?

I have an APR chip as well, Also is this normal?

Aug 3, 2009 | 05:19 PM

Mike-2ptzero

4th Gear

Joined: Apr 2008

Posts: 3,274

From: Phoenix, Arizona area

most likely caused by low compression or you have a nice size leak at the intake manifold.

Aug 3, 2009 | 05:34 PM

2fast4u66

Senior Member

Joined: Mar 2009

Posts: 185

From: littleton, CO

Prob a leak (hopefully), do a boost leak test and maybe even try a different gauge to confirm your vacuum pressure.

Aug 3, 2009 | 08:02 PM

compmanben

Senior Member

Joined: Jan 2008

Posts: 308

From:

hey welcome to the forums, we're always happy to have new members. just so you know, when you get to negatives, the measure for pressure is either inches or millimeters of mercury instead of psi.