Just a quick response ... I can reproduce it in the garage with the engine running, with a little throttle and by disconnecting the by-pass valve so that it is in full boost mode. The engine would be running 3000 RPM no load and I can control the boost pressure with my thumb over the the temperture sensor hole. As the pressure builds, the throttle will not be able to be moved in either direction. I tried a stronger spring without success. The bottom line is that I cannot move the throttle by hand.

I'll search the site tomorrow for the postings that you mentioned. I am sure that it is the same problem. Finding other peoples solution to problems is the true value of this site. Thanks.

__________________
Jim Villers
190SL, 230SL 5-speed, 95 E320 Wagon, 01 E320 Wagon, MGB, Boxster 'S', 190SL "Barn Find"