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I was hoping to get some comments on this. I wish I would have looked at that orifice that supplies the lower chambers when I installed the new diaphram. But I'm not taking it apart again now, I just want to get the car running at this point. Under a steady state condition (no changes to airflow, ie. no change to the plunger position, the lower chamber pressure will equalize with the system pressure even with the orifice. This assumes the FV is inoperable, ie. closed. But I'm thinking that under an air flow increase, ie. more flow and pressure to the top chambers that orifice may not allow the diaphram to push the fuel out from the lower chambers quick enough and as a result cause a lean condition? At this point I'm just going to try reducing the control pressure and adjusting the idle mixture screw to try to get it to run w/o the FV operating. I don't want to get into troubleshooting the lambda wiring mess to figure out what the problem is. I'm eventually going to remove all of it.
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