No vac at idle. None. Searched, fixed leaks, compression tested.

[johnwohl]

Hey guys, I've been having a problem now for about 2 weeks. I have no vaccum at idle. None. My boost gauge reads a hair more than zero (like 1psi+ not vac), and if I take the line of the boost gauge and put my ear to it or a finger a feel no vac but i instead actually hear and feel a bit of positive pressure.

I searched the forums here and this is what i've done so far.

I've tested from just after the intercooler with a boost leak tester and fixed my leaks. They were the throttle body shaft seals and the lower fuel injector insulators. the leak tester now holds pretty steady at 15psi.

I did a compression test. 152-154 psi on all cylinders. so that seems good.

I've heard of cars having low vaccum but not no vaccum

I do get a tiny bit of vac when changing gears.

 

[marcmsj]

Your car wouldn't even be running if it had obsoletely zero vacuum. I would suspect a faulty vacuum/boost gauge, try another gauge.

Is your car idling/driving alright?

 

[johnwohl]

Ok, ok im an idiot. I did't realize that not all of the nipples on the top of the TB are vac sources. I switched it up and viola. At least I got those leaks taken care of tho.

 

[talonalex92]

Heres an even better idea, ditch your vac. source on the TB. Instead take it to the FPR line, that sees direct manifold vacuum and pressure. Its ten times more reliable!