Note: the one way valve that is inline from the tap on the intake to the vacuum tank for the IRIS has a history of cracking with age, causing a vacuum leak and elimination of the function of the IRIS. Easy to check, as you can actually get to it from the front of the engine 
-Bill
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Retired NASA Rocket Scientist
Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023
Center Network Member #989
'92 Fully caged, 5 speed, waiting for its fully built EG33
'92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension
'92(?) Laguna, 6 spd and other stuff (still at OT's place)
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