Question : MY automatic Wira has a vibrating wiper that does not
give a smooth wipe.
I have changed to synthetic wipers. The wiper arms and most parts have
also been changed except the motor.
Do you think I should change the motor too ?
If you mean that the wiper blades are
juddering on the screen, then look at the
condition of your glass.
You may need to get a good detergent
and give the glass a good clean because it
may have accumulated a film of oil and dirt
that is causing the juddering.
On the other hand, if the glass is clean,
you may need to bend the wiper arms
slightly to change the angle of the blades
to the glass. This may solve the problem.