Benzborg, 3.65V is actually ~70% duty cycle. A 50% duty cycle is what your engine would optimally be at idle. 6.5V is ~50%. It's good that you are getting 6.8V at 2500rpms, means that your EHA is functioning correctly. However, A fixed value of 70% at idle indicates....
Quote:
No TD/TN signal
Open circuit in wiring at KE control unit (N3)
Test TD/TN signal
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The finger is pointed at the ECU....yet again.
The microswitch referenced above is located near the throttle linkage. It's a little black box about the size of a matchbook. It's got a little roller on one end. It's primary use is on
de-celleration. It tells the fuel injection to cut off fuel when you let off the gas pedal. It's worth looking at, but probably not the root cause of any of your major issues.