Cb is fine when vehicle is off , but when vehicle is running it feeds motor noise back threw my cb?

Has a timing problem,if it has a distributor check rotar arm.

This is a timing issue and is probably related to the crank shaft sensor being bad.

I would try an inline noise filter, the hum they are hearing is most likely vehicle electronic interference from alternator, etc. On my older Camaro I had the same hum in stereo and others heard it on CB, I installed noise filter and everything worked great. You can find them at truck stops, CB shops and some auto parts stores, they usually run in the $5-$10 range.

Interference may be caused by non - resistor spark plugs. If you don't want to change your plugs for resistor plugs, you may be able to get an inline resistor for the antennae from your local electronics supply store, like radio shack. Failing that, you can buy a cb antennae with a built in resistor coil that will also do the job. If you buy the new antennae, go to a cb shop to have your antennae tuned to your cb - it will increase your range and clean up your sound too.
Hope this helps, and please rate my solution!!

I am not sure ............if this radio has an "RF" control....if so try to back it off or back off on the squelch control.If the noise is comming from the vehicle you will have to filter out the electrical interferences causing the problem. Each appliance has it's own problems.
Make sure the device IS WELL GROUNDED. Sometimes you have to ground ALL the NEG. wires to a central point. This includes running a ground wire....# 12 - 14 directly to that same central point.

You will need to install a noise filter, you are getting interference from the Alternator in your vehicle.

Its just RF feed back, that's normal, try to re-route the coax, or just turn the FM down, o try turning your modulation down....hope this was helpful....

You are getting engine interference from the electronics in the ignition system. First you need to see where its coming in from, The antenna or the power wire.

Turn on the vehicle, and the radio. Then while you hear the noise interference disconnect the antenna.(Do not key the radio) If the noise disappears when you disconnect the antenna, then the noise is coming in from the antenna. Relocating of the antenna may be necessary and or you have bad coax and it may need replacing. If the noise is still there when you take the antenna wire off, then the noise is coming in through the power wire. (this is most likely.)

There should be a setting called ANL (automatic noise limiter, or DSC. Turn this on. That should get rid of it, or make it not so present. If there is still a lot of engine noise then.........


There are only 2 ways around this.

1) Run the power from the radio directly to the battery. This will solve the problem.

If you cannot run the wires to the battery, then you can do the following.

2) Get a ground loop isolator for the power wire. Make sure its not one for the RCA jacks for an audio amplifier. Its made for the power wires. This hooks to where you have the radio connected to now, and then the radio hooks to it.

You can get them from radio shack, but usually they are not in stock and you will have to order it.

You can also check to make sure you have a good ground.

i have the same radio turn talk back off and there is enough power ull have talk back through you trucks radio speakers and it needs to be hooked up to the battery with at least 12ga wire

You might try running an insulated wire and ground directly from the battery.