Well you guys across the pond have been busy while I've been asleep! A couple of observations.

1. The function of the OVP is to shut off power to the ABS and fuel computers to protect them if the car system voltage gets too high (for example if the alternator's voltage regulator screws up).

2. As Steve said, the KE fuel injection system is a mechanical one with electronic aids. If the engine and ignition system are in good condition it will run without any of these aids - I know because my 230TE (UK petrol prices are such that most of us can't afford to run 6 cyl cars) ran with a failed OVP on and off for months 'till I fugured it out. My project this sunny Sunday morning is to see if the HFM equiped E220 will run without it - I guess it won't.

3. The car that ran worse when the OVP was replaced must have had the mixture and idle (I think earlier ones had manual idle adjustment?) when the electronics were not working.

4. The common problem with the OVP is bad soldered joint on the PCB. It is easy to repair, just open it up and run a hot solder iron over all the joints.

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Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)