Idle adjustment question, Idles high or slowly stalls Options

[BillC]

I have an idle adjustment question for all you D-Jet gurus:

I can adjust the idle air screw on the throttle body so the car idles at 1600 RPM, and it will happily idle at 1600 all day long. If I turn in the screw just a little bit, like 1/4 turn, the car will slowly drop idle speed down slower and slower until it stalls. I can blip the throttle to keep it running, but it just wants to slow down and stall. This is all when the car is fully warmed up.

How do I get the car to idle steady around 1000-1200 RPM? 1600 is just too high.

Car is a '73 2.0 with factory D-Jet. I installed new Standard Products FJ67 injectors, and the fuel pressure is 29 psi. There are no leaks in the intake side, and the idle adjustment screw is about 2 turns out (so there's plenty of adjustment available in both directions). The MPS hasn't been messed with, and the ECU looks like the correct unit. All new vacuum lines, fuel lines, pump & filter, and fresh gas. New @JeffBowlsby engine and alternator wiring harnesses.

Known issues: it has the wrong CHT sensor (it's the one that's commonly available) and I think the TPS board has worn traces. I finally found the right CHT and ballast resistor, and I also have a 914Rubber replacement TPS board, and I will install both of them when I get a chance. However, I don't think either of those should keep it from idling at a reasonable RPM.

[emerygt350]

Did you check the timing when it was at 1600? If your weights are sticking you will see it far more advanced than it should be. The 10 is concerning.

I would:
1) check the timing when it sticks at 1600.
2) if the timing it not overly advanced (anyone know what it should be at 1600? I would guess somewhere around 17) than I would put the mighty vac on the mps and see how the engine reacts to 17inhg.
3) if that brings the idle down to where it should be (ish) than I would do a crusty style valve adjustment http://www.914world.com/bbs2/index.php?showtopic=28758

I would then check my vacuum again. If it's still at 10, compression and leak down?

This is all assuming the lift rules out the aggressive cam.

If you think it might be the aggressive cam, just pop the mightyvac on the mps, give it 17inhg or more and start the car. See if it idles where it should be.