I have been told lately that I have a ton of feedback when using my bluetooth head unit in my 300D lately. Interestingly I used to have really good call quality and I havent changed anything (same phone, same head unit). Normally I would suspect EM from the ignition system as causing problems, but obviously there is no igniton system on a diesel, and not even high frequency noise from electronic injectors. Does anyone else have this problem? I might just swap out the head unit but I hate to spend the money without knowing that it will fix anything.

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'85 300D - federal spec, built in late 84. 85 300D Complete AC System Rebuild