I am working on a 1992 190E 2.6 75,000 miles. The car is very, very difficult to start cold and runs poorly until it warms up. It obviously is starved for fuel during cold starts, since it fires right up with a little starting fluid. It runs and drives fine after the engine warms up.

The thermo sensor switch on the head seems to be ok, but the cold start valve has been checked and is functional, but it is not being energized during cold starts.

The electronic control boxes and relays are behind the battery. I do not see a fuel pump relay as most others. There is a "MAS" box, a over voltage relay and two large control boxes ( one for the ABS and the other the main engine ECU I suspect).

It seems like whatever controls warm up running and cold starts on this version is the culprit. Can someone point me in the right direction. I hate to replace expensive ECUs or relays if not needed!
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Joe Alexander
Blacklick, Ohio
1964 220SE Rally (La Carrera Panamericana someday)
1966 Unimog 404s (Swedish Army)
1969 300SEL 6.3 (sold)
1969 280SL Pagoda
1973 280SEL 4.5
1974 450SLC FIA Rally car (standard trans)
1982 300D turbo (winter driver)
1986 560SEC
1989 Unimog FLU419 (US Army)
1991 300TE (wife)
2002 SLK 32 AMG (350 hp)