FWIW, I am experiencing very similar issue with a 1999 E46 328ci. Car is now in storage while I free up space to convert into a truck car, but I was headed in that same direction (cling DMW connection) after replacing the TB. Once I get some space, I'll bring it home and take a look at the connection. Thanks for the post and troubleshooting....
tim
Tim
1999 E46: Daughter
2001 E53: Daughter
2005 E320: Wife
2005 RR L322 (M62): My Daily
1963 Land Rover SIIa: Dogs
1986 930: A Rush
1982 911 SC
1990 E30is: maybe track car.
1993 E36: selling.
1995 RRC SWB: Selling.
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