Mercedes-Benz Forum - View Single Post - M103 Rough idle and vacuum leak
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post #10 of (permalink) Old 07-11-2017, 11:15 PM
dolucasi
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Date registered: Dec 2012
Vehicle: 89 190E2.6- 5-speed Manual, 95 E320 Sportsline-sold, 2001 E320 4matic Wagon-sold
Location: San Jose, California
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For some reason the links to your google photo album is not working for me.
But if your OVP is truly 19 years old, like you believe it is, it has to be changed. A KAE unit is about $45 I believe. Mercedes Benz brand might be slightly higher.
I would recommend KAE, that's what i used and was was in the car for 12 years.
I have tested 2 OVP's on my M103 in the last 2 months, one was 12 years old the other was 18 years old.
Both appear to be OK but both were having intermittent idle problems because the ECU kept switching on and off, most likely because of the internal relay circuitry being defective/worn in the OVP.

Whether the OVP is your main problem remains to be seen but it is quite likely. However I would like to see your idle first to see if it is similar to mine when I was having similar issues at a lesser extent.
Can you put it up on youtube instead and post a link?
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