Paul3446

Does anyone know what would cause a windscreen wiper to vibrate across the windscreen, causing a noise like a large blow off?

The passenger side one does this unless it's really wet, I have bought 3 new blades, which resolves the problem for a month or so, then it starts up again.

alcazar

iTrader: (2)

Yes mate, it's down to the twist on the wiper arm.

When the wiper arm isn't moving at all, lift the blade, and GENTLY set it down on the windscreen, it should sit EXACTLY, (or as near as possible) at 90 degrees to the screen.

Twist the wiper arm, (the thin bit) until it does.

Alternatively, check which direction it's moving in when the vibration occurs, then twist it slightly in THAT direction.
A bit at a time is best, and keep tweaking until it's good.

DO PUT WATER ON THE SCREEN before each trial

Alcazar

Paul3446

Cheers for that, I'll give it a go, it's always on the way up that it lets rip!