I recently just put in my stock injectors, (running NA for a bit until the weather calms down), and i noticed a tiny little hole in the intake manifold underneath the center bolt for the intake manifold. my car (NA) as of now has been idling at 19 vacuum on a cold start and when its warm its at about 19-20. could that tiny of a hole cause that much of vacuum loss??

dumb question for fun...HOW THE HELL DOES THIS HAPPEN?!?!?! LOL

 

-20 is around normal vacuum. one easy way to check if its a leak. start the car and sray some brake cleaner around that hole. if your car revs a lil when you sprayed then its a leak. but since your n/a i dunno how in the hell you got a hole if it is a hole. maybe you just had a faulty manifold

 

i did run nitrous on this particular manifold...but i still dont see that causing a pinhole. usually there would be a hella lot more damage than that. and thank you for the advice!!!

 

just do the method i said. maybe its not even a hole in the manifold.

 

when fully warm you should have between 20-22 inhg vac

 

I have that same hold in mine. Its actually a drain hole so that dirty water doesnt sit there i believe....Its not actually a leak in the manifold it just goes below it

 

ohhhhhh ok. well that clears this up! its like such a perfect hole, i couldnt see this happening any other way! thank you!

 

iv never noticed that hole before...ima go look at all my pics

 

We had one fail a few years ago at 16psi, in the heat of the summer out here in CA.

Boost vs OEM parts...