Hondata

If it is working correctly with your conversion and a different ecu with the s300, then you may have a damaged ecu.
I doubt that. A friend of mine has the same problem (high idle) with JDM p30.

As for low RPM on warm-up - could absence of FITV be the cause? If yes why Hondata does not have an ...

Spunkster wrote:Is your IACV 2 or 3 wire?

Originally it had 3-wire IACV but I put a 2-wire one.

I have JDM P30 running H22A7 from Accord Type-R.

Just after start up RPM is significantly lower than specified in the calibration during warm-up for about a minute.

Another issue is with idle: I can't set idle RPM lower than 850. This must be a problem with ECU. Because if I plug EDM P30 ECU with ...