vaccum on boost gauge

gulzar

LCR jabba'd
Oct 1, 2007
178
0
absolutely faisal, should have seen the look on your face. its always nice to get to the bottom of a problem init ;-)

gulzar
 

adam cupra 20vt

Built Not Bought.
Mar 31, 2005
6,162
2
Mud Hut
Can anyone explain why when I first start the car in the mornings it only reads -10 until I rev it and it goes to -17?

Is it because when the engine is cold the idle air control valve opens and puts un metered air into the intake causing a lower reading?

Then when it stops engine revs drop and vaccum increases?