More D-Jet, High Idle Lean Mixture Options

[ggress]

Just getting a '74 2.0 running that I purchased few years back. Replaced all fuel lines, vacuum lines, and FI Harness. It runs better than I expected but not good enough.

It idles too fast (1300 / 1400 RPM) considering throttle valve bypass screw is all the way in. Also, it runs lean (using WB A/F meter). I have set the mixture adjustment on the ECU full CW to get mixture around 13.7:1. I think I have covered all the common vacuum leak issues described in other threads. Any suggestions appreciated. I have two specific questions below.


1) Is my ECU P/N correct? The base P/N is correct but not sure what the 090 suffix means.

2) With the throttle valve bypass screw turned in full CW there is still vacuum getting past the screw. Does anybody know if that is normal ? I can put my finger over the port and feel vacuum. Maybe by design it is not meant to provide positive shut off but I don't have enough experience to say one way or the other.

Thx

[Dave_Darling]

It's normal for air to still get through the bypass passage with the screw all the way in.

Your timing may be over advanced. But more likely, you still have a vacuum leak somewhere.

--DD