I've installed a Pioneer cd player in my car. Unfortuntaly it does not have an AUX input (for an mp3 player, etc), but it does have an input for a CD changer. I found the pinout diagram of the connector, so i was able to make a cable that converts this to an AUX input...it works fantastic, however, im picking up a ton of engine noise.
I've read that this is a known problem with 850's and AM reception.

I am using the ground on the connector to ground my stereo minijack. This is the common ground from the original 850 radio. There is no engine noise while playing a cd, or listening to the radio. Does anyone have any suggestions to remove this noise?

Would it be the same problem that so commonly prodouces noise while listening to AM radio?

Thanks!

A lot of possibilities here. I would find a more stable ground (maybe), but depending on the spark plugs you install, the engine can really play a number on the audio. The Volvo OEM plugs seem to be the best in this regard.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.

any ideas on a more stable ground? isnt the ground to the radio just the common ground for the car, so i would run into that problem no matter what?? I was thinking about building a 'virtual ground' from a resistor bank..any suggestions?