300E misses with A/C on...Why???
 

My 300E is finally running good after all the $$ i spent. Well I rarely use my A/C, but when I turned it on today my car started to miss. It misses about every 5 seconds. Well the idle rests at 500 rpm but when it starts to miss the idle fluctuates and peaks at 750 rpm, and it does not miss that much when in D(Drive), only when in P(park). This only happens with the A/C on, the miss causes a slight hesitation when comming from a stoplight.

I have replaced all vacuum lines

What could be the culprit???

anyone have a clue??

Check the OVP because it powers the A/C control unit.
Maybe when the A/C controlunit is "working" it makes a voltage drop at the KE jetronic control box which regulates the EHA and some more.

OVP is an old way of controlling for overvoltage.
I´m thinking of designing a new one.

Pelle

300E 4M -89 5sp