Ok, so I was taking my intake apart yesterday to install 5th/6th port sleeve inserts. I discovered quite a bit of oil in the Dynamic Chamber. Through some investigation I found that the oil was coming in through a vacuum line on the back of the chamber (towards the fire wall). Its the bottom of the three lines stacked up back there.

From the vacuum diagram and the help of some one else, it looks like thats the vacuum to the MOP injectors. This leads me to believe that the check valve in one or more of the injectors is bad.

So my question is, should I replace all the injectors, or are they rebuildable?
What do I need to do to fix this?

The car is a 1990 S5 Convertible.
No, I will NOT remove the MOP system.

 

Seems like you may have them plumbed incorrectly. I know on FD's the vacuum line is plumbed to the primary turbo inlet. They need to be plumbed to a source of clean air that see's neither vacuum nor boost. So in this case pre throttle body for NA. If the check valves are bad, new nozzles are $50 for both of them from Ray Crowe. Either grab some new ones and swap them and plumb them correctly or you can place a check valve externally to them. Just make sure it's pointed the right way

 

are you sure it isn't the crank case ventilation?


if the injectors are bad, replace them...

http://www.mazdatrix.com/getprice.as...m=14-6350-N318
http://www.mazdatrix.com/getprice.as...m=14-6310-N3G1