Mitsubishi Eclipse 1990 Service Manual page 1871

Ex. Noise produced
here
BODY Door
HOW TO LOCATE
(1) Attach cloth tape to every
projections, molding seams, glass and body seams, etc.
which might conceivably be the source of wind noise.
(2) Then make a road test to check that the places not covered
by tape are not sources of wind noise.
(3) Then remove the strips of tape one by one, making a
road test after each is removed, 'until a wind noise source
i s d i s c o v e r e d .
(4) When such a place is found, cover it again and repeat
the procedure to check if there are any other noise source.
(5) If no others are found, the' last
only source.
(6) Cut the remaining piece of tape into
it again as it was before,' and then remove the pieces
one by one to narrow down' the source.
(7) Check to confirm that wind noise occurs when the last
remaining tape is removed, and that noise does not occur
when it is re-attached.
(8) When the source(s) of the wind noise is finally located,
attach butyl tape, body sealer or similar material to obstruct
this source as much as possible.
such as panel seams,
tape the
attach