After taking my 89 260E through certain automatic car washes, I notice steam
and smoke coming out of the exhaust for a few minutes, then it stops.
It seems that water is getting into the exhaust system somewhere, and mixing
with oil residue to cause the smoking/steaming. This started a couple of
months ago after I got new tires -- and drove the car off a lift which, I
discovered when I felt the scraping under the car, was not completely
lowered. Is it possible some part of the exhaust system or catalytic
converter is loosened or cracked and allowing water to get in?
This only happens when there is an undercarriage wash. When I wash my car
myself, and spray water up the exhaust , there is no smoking.
Any help would be appreciated.