the car is a 91 560 SEL. I have had these issues for a while now. I had the chance to do the following today. Would like to know what it all means and suggestions on how to proceed.

1. Hard Start when cold - When car is parked for a few hours or overnight, it takes a couple of cranks to get it started. The first crank about 4 seconds, adn the second crank starts right up. OVP is about 3 years old. I ahve the one with 2 fuses. Fuses are good. When ignition key is ON and engine is OFF, the voltage across the EHA wire harness is about 5V(open circuit - wire harness not connected to EHA) and the current is 0 (zero). I have read that there should be current flowing with the ignition switch ON and NEgine OFF? am I correct? Does this indicate a bad OVP? or Are there other things I need to check? NO Engine Light is observed. Water temp sensor and throttle switch checked-out okay using MBZ manual procedures.

2. High Idle at Park and Neutral - Idle sometimes stays at 750 but most of the time at 1000. In gear it is about 650-700. With Ignition switch ON and Engine OFF, the voltage accross the ICV wire harness fluctuates between 0.3 to 1.7V(open circuit - wire harness not conencted to ICV), and voltage stays at 0.3V with wire harness connected to ICV. With the engine running and in park, the voltage accross the ICV is about 5V, with the idle as stated above. Removing the wire harness while in idle and Park, would cause the idle to jump up to about 1500. Rough idle is obvservable but very negligible at this time... Any thoughts?

Thinking whether I am not measuring current correctly with the 2 above having measured as zero amps. But, current measurement is in series while voltage in parallel with the load being measured. Nothing much more, unless there is a something I am missing.

thx