Hi Guys after removing my PRVR's and my AIV's I now have low vaccum.

I used to have -20 ish at idle but now I'm down to -14ish.

 

Is this right ?.

 

I thought this was down to boost leaks with the new Greddy IC's but after fixing these I'm still sitting at -14.

 

Any ideas ?

sounds like a vacuum leak (notice any hissing sounds ?)

 

Did you bypass the AIV solenoid correctly ? ...otherwise you'll have a vacuum leak

 

-Eric

I'll double check again tonight.

You have me concerned now, I have a vacuum on the boost gauge (Greddy Profec e-01) of -9 to a max of -11. What should it be?

Mine was also between -19 to -20 when I last checked.

My UK spec idles at about -13 psi and will drop below that when taking my foot off the accelerator at normal cruising speeds

found the problem. One of the vacuum hoses on the bottom of the plenum had slipped off. This was AIV related. I'm back up to -19/-20 at idle and she's pulling like a train at 15 psi :o. Can't wait to see what she gets me at Thor tomorrow.