Engine Noise through stereo

superdart said

What I find funny is that I had mega engine noise in my aftermarket stereo on my 1992 Olds Cutlass Coupe, but zero when I installed my new system in my Dart...go figure...LOL.

CD player
2 - Pioneer 6x9s
1 - JL 10W3V2 subwoofer
1 - Kenwood 1200w 5 channel amp

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Doesn't surprise me. The problem in the Olds was possibly either the electric fuel pump or electric fan, or both. Both are known to cause noise. Fuel injectors can even cause noise. The electric fan on my old Dakota caused alot of noise and a filter at the power input of the stereo didn't kill it all. I finally made up a choke/capacitor filter and installed it as close to the fan motor as I could get it and it completely stopped the noise. The parts were very specific I remember. I tried several different capacitors and chokes until I found what worked. If I would have had an oscilloscope I could have figured it out alot quicker but....