[William Miller]

Having simular issues with my 3.6 transplanted into my 81.
I'm searching threads at the moment.
The workshop manual shows the basic tests, but not much on how the components actually work.

I gone back to a Bently Manual for '84-89 carerras and there is a bit more explanation. I also have the blue bosch book which taught me a lit aoit CIS, ut it's not Porsche Specific.

So is ther a way to bench test the ICV?
What should it do when the engine is running and you disconnect the electrical connection?
I thought I read somewhere that the idle should increase to something like 1500 or 1800. Mine actually drops.

I believe I have a vacuum leak causing it to lean out, because while running if i push the flap in slightly the idle smooths out. (Like lifting the plate on a CIS meter plate. I screwed in the ajustment (bipass) plug too full closed and that helped, but I think it is still running lean.

I hooked the vacuum gauge up to the port for the flapper and it was only pulling about 10", But when I pushed the flap in which made it richer it pulled between 20-25". Also pulling about 21" when above 2500 rpm.

The car runs great except for cold startup and idle.
Fuel pressure was high, but that went lower when I pulled about 20" using a hand vacuum pump on the vacuum hose that goes to the fuel pressure regulator.
With no vacuum the pressure is 4.1 bar with 20" it's more in line with spec. which i recall is like 3.6 bar.
I don't see any obvious vacuum leaks, but it sure seems like it.
Someone asked for the best method to test. How do I pressurize the intake carefully without blowing all the gaskets and seals?

Thanks!

BTW no OBD connector on the transplant although I left the wires avalible.
Could I get a standard connector at the junk yard and make a harness to the DME wires myself? It seems like one of the biggest issuesI've read is the odd round connector in a stock 964. Are there other hurdles?