I have eliminated the broken EFE-EGR switch (didnt need it anyhow since I am not using EGR or EFE), and it leaves me with a PEC valve vacuum line question or two...
I have a 3 port PEC valve.
It screws into the intake manifold so thats where it senses the boost and vacuum,
and I know which port should go to the power piston on the carb.
the other ports appear to be EFE vent ports. I am trying to decide whether to cap them or leave them open.
The 78 service manual shows One port is connected only to the back of the carb. So I figured I would just cap that one.
The other port is teed into a series of hoses that connect the vapor can and carb vents to the EFE valve, which in turn is connected to ported vacuum at the carb baseplate. There is a one way check valve between the EFE valve and the vents etc ,
Does this PEC valve have two separate circuits? one for the power piston, and one for the EFE stuff? Or are they somehow combined, where I still need the ported vacuum signal to the PEC valve for it to function correctly, even though I have eliminated the EFE?
thanks for any insight.