Low Vacuum like -10psi Idle

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08-03-2009, 03:55 PM

neoneddy

Junior Member

Thread Starter

Join Date: 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?

08-03-2009, 05:19 PM

Mike-2ptzero

4th Gear

Join Date: Apr 2008

Location: Phoenix, Arizona area

Posts: 3,274

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

08-03-2009, 05:34 PM

2fast4u66

Senior Member

Join Date: Mar 2009

Location: littleton, CO

Posts: 185

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

08-03-2009, 08:02 PM

compmanben

Senior Member

Join Date: Jan 2008

Location:

Posts: 308

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.