[mark houghton]

Originally Posted by boosted79

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.

There are CIS wizzards among us that know a boat load more than I, so all I can do is follow your thread because it seems to make logical sense. I for one would love to do entirely without the Lambda circuits...all I do now is run with the O2 sensor unplugged/open loop and tune around it. Of course the frequency valve is still buzzing away but my fear is what ifff that freak valve were to die?
For kicks many many moons ago I unplugged the freq valve and attempted to tune around it. Not happenin', she ran wayyy lean according to my AFR and I couldn't compensate with simply cranking down the idle mixture screw. I'm all for getting rid of anything that may eventually strand me.