1991 n/a rx7 it I broke one of the secondary injector diffusers trying to get it out. It has two o-rings on it and a channel in the center of the two o-ring that if you look on the outside of the upper intake has a vaccum nipple on it.

My question is on the outside of the upper intake, below the secondary injectors are two metal nipples one on each side of each injector. The one nipple has vacuum and the other one does not with the engine running. which one is right???
Should both of them be pulling vacuum???

Also, could this contribute to a idle problem??

 

Another thing i don't understand is on a s5 secondary diffuser why put vacuum in the channel between the two seals of the diffuser??? There is no outlet only if one of the seals fails.

 

The fuel injector air bleeds do not get vacuum. That's about all I can say since I don't have a series five.

Fuel injector air bleed pressue is on the same principlel as the oil injector air bleed air.

 

The injector air bleeds do almost nothing except at idle.
When working, they are supposed to help idle efficiency.
They work on the differential pressure between the front & back side of the throttles.

Many owners remove the FI air bleeds and say they can't tell the difference.

Most owners keep the oil injector bleeds.