[tirwin]

Good job.

So for 1.5 bar @ 16°C you are off. Consider the midpoint at 16°C is ~1.9 bar. You are off by .4 which is ~20%.

There is little margin for error according to the chart. The scale of the Y-axis is in .1 bar increments and the scale of the X-axis is in 2° increments.

Objectively, we’re left to conclude that 1) the CCP is not correct, but is not the problem (or contributing to your problem) or that 2) the CCP is not correct and is the problem (or contributing to it.)

You said your idle AFR was set by the engine builder by feel. To me that makes it unknown. Yes, you can be too rich on cold start in theory. Are you? Not enough data to draw a conclusion. We only know 1 variable (WUR) is not in spec.

If #1, then we’re back to square 1 and there is some other issue not yet identified. Troubleshooting continues.

If #2, send the WUR back to company for recalibration under warranty.

If you rule out all other possibilities then you’re left with #2 and unknown idle AFR.