>Start with the EHA off. What happens to the airflow pot voltage as you rev the motor. it should start low (below .7v to be exact) and it should rise to above 3-4v under snap acceleration. This can also be verified with the ngine off and key on by deflecting the flap with ones hand.

Unfortunately not as the voltage changes when eng on. However, I will try if EHA off when Eng on changes this.

Positive, 3 pins. 1 (-), 2 slider, 3 (+). U13 is 4.8V (in range). The voltages we were talking about are U12.

I will check the idle valve and refine my measurements tomorrow.

Thanks a lot already for your support!

Tom