123 distributor on a 2.0 FI Options

[Robson51]

I got one of my boys a 123 Distributor for his '74 2.0 with stock FI. I've had one in my 912 for some time and love it. We pulled the motor last year, just got it back together over the last 6 weeks or so and had some trouble sorting it. The two big changes while the motor was out were a rebuilt throttle body and the 123.

When we got it running, there was a big surge at 2800-3000 and the plugs looked rich. We fooled around with resetting the TPS, and a few other things and nothing seemed to work.

The original curve was the one from 123 that included vacuum advance on the bottom part of the curve. I spoke to 123 at one point and they told me vacuum would let it return to idle better, but it always kind of bothered me to have a state of the art digital device relying on vacuum.

Last night we scrapped that curve and went with a totally digital one. Problem solved! Blast right through that range with no problems. I don't know what was happening with the curve when we were trying vacuum advance, but frankly I don't care enough to spend any more time on it.

Try this if you're having any issues-curve attached.



Rob