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You need to install a vacuum switch valve in the ignition circuit to stop the engine with the key, the engine stops when vacuum is routed to the shutoff of the injection pump.
In 123, 124 etc the vacuum lines actually are connected to a valve on the ignition lock housing, in your W140 that bit is missing. Use any generic vacuum solenoid valve for this purpose.
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2012 BMW X5 (Beef + Granite suspension model)
1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)
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