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So, when you place the previous module back in place and reconnect, the interference is gone? usually i would suspect wiring - the interference from the engine running probably comes from the alternator (if you have the whine on sound lines) and from other radio-emmitting devices (there are plenty of those in the back of the car). The interference is a result of poor shielding, as you have correctly noted...
if the MK3 has no interference and MK4 has it - the issue could be in the inside circuitry of the MK4...
if the MK3 did not have issues, then the MK4 got the issues and when you put the MK3 back, the issue is still there, then you need to look into the wiring harness, you may have a chaffed/nicked/detached ground wire somewhere (ground wires are chocolate-brown).
Barry, welcome to the forum... it seems that you have an E39, as you mentioned but it is always nice to know more details of the ride and the option packages that you have for a proper suggestion... since your location does not tell us if you are driving a US spec or EU spec car, a signature line might be helpful...
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