Hi,
As suggested by ILUVMILS I checked the exhaust area and sure enough there were several small pieces of some black colored residue/cloth type material lying on the exhaust & transmission. Looks like they fell off the small rectangular pad on the wirewall behind the engine. I used my leaf blower and blew the debris off. I don't get that smell anymore. Thanks very much ILUVMILS.

smk_texas
98 S420 49K
93 400e 137 K
92 190e (previously owned)
83 300D (previously owned)
81 300SD (previously owned)