Jim,

Sorry, my car is a 5-speed manual. I changed the OVP relay recently as the idle was not coming down to its usual 900 to 1100 rpm. That did correct when the relay was changed, the idle is now less likely to get hung up at 1800 to 2000 rpm. I also changed the temperature sensor for the auxiliary fan as it was not functioning and the fan never came on. The fan comes on now, when the temperature approaches 100 degrees Celsius. The belt driven fan clutch also engages correctly. I will check the other temperature sensor.

I just examined the underside of the octane selector plug cap and found one setting with no prong to engage the outer socket and set this (the connector that is missing is under position number 7 on the cap), and set it to run that way. I will check it out and see what I detect for differences. Thanks. Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)