Rob Here again, re j430 radio noise, I have a new radio 833 which re much more sensitive than the old 25KH, I have replaced the distributer caps, the rotor arms,the ignition leads, screened the leads,screened everything I could, replace coil packs, absolutely no improvement at all.
In desperation I covered the entire engine in tin foil as an experiment to contain the interference and it worked, I then remove it and sprayed the entire engine bay with a screening spray and I now have a quiet radio. I could not fix the problem but I have fixed the symptons. I will be happy to share the spray used if anyone is interested.