checked the 3 transducers today,when i apply vacuum to the topmost nipple with no voltage applied will not hold any vacuum,however when i connect 12v to the terminals they do hold with no leakage.The 3rd one is down under the air cleaner box and not easy to get to the wire connector but it holds vacuum without voltage applied.Does that mean that 2 of the 3 are bad or 1 is bad.Or could it be that i am not testing them properly.The intake flap actuator leaks down, the egr holds and can hear it drop when the vacuum is released and the wastegate actuator holds as well. All sugestions and opinions are welcome. Looking forward to you comments. TIA Don

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97 E300D 157000 miles
87 300TD ?141k? miles