I was reading through the Posts on this site. The OV regulator gets blamed for a large number of problems - ABS, fuel pump, AC, etc. - It sounds like you ought to replace it almost as a maintenance item. I did.

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Chuck Taylor
Falls Church VA
'86 300E 5 speed
'95 C220 (wife's car)
'98 Porsche Boxster
Past: '79 280E, '82 300D (18 yrs), '77 240D,
4 250C's