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The valve is opened by the motor -- may not move real easily by hand.
Probably time to clean it though -- are you experiencing occasional stalls upon stopping? If so, time for cleaning the valve and probably replacing the idle hoses -- the get hard and leak air, causing all sorts of running problems including serious throttle lag.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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