Sounds like the "radio suppression relay". This part powers the
injectors and ignition (which use power in pulses, which can affect the
radio) directly from the battery, to try to eliminate these annoying
noises. I'm just surprised one has been installed on your car at this
late date.
--
Mike F.
Thornhill (near Toronto), Ont.
NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)