What's causing my Subaru Impreza to 'clack-clack' when turning left?

I have a 2002 LPG-converted Subaru Impreza Saloon with 120,000 miles. It is serviced regularly. Recently, when turning left, it has started to emanate a clack-clack-clack sound which increases in rapidity with acceleration. Oddly this does not occur when driving in a straight line or when turning right. Any Ideas?

Asked on 8 August 2010 by Charles Jackson

Answered by Honest John
I'd guess at driveshaft universal joints.
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