The noise was from the transmission control module. I solved it with a 150pf
capacitor between the 12 V supply line of the TCM and ground. The
capacitance and length of wire were both critical.

Chris
"Chris" wrote in message
link.net...
| I just installed a CB radio in a 92 Plymouth Grand Voyager. All went
smoothe
| except for one thing. There is something in the van causing a great deal
of
| noise in the receive on certain channels. It sounds like a constant
| mid-frequency tone. It comes on when the ignition switch is turned on but
| remains on for 15 minutes or so after the switch is turned back off. When
I
| listen under the hood, I can hear a faint noise from something electronic
| there. It is the same pitch as what I hear in the CB. When that noise
quits,
| the CB noise quits. Could it be the fuel pump or injectors? Someone please
| help me locate the source of this noise. If I know what it is, I can deal
| with it better.
|
| Thanks,
| Chris
|
|
|