Hi My 93 S4 has developed an overboost cutout type bucking at only moderate boost(1.4 bar or so). I am assuming the WGFV is sticking, correct assumption? How do I test it and, no, I don't have a mate down the road with a spare S4 to swap with. Sam Clarkson Edge to Edge P.O. Box 27 National Park 2653 Ph 0800 800 SKI (754) http://www.edgetoedge.co.nz