How would I fix my car radio's noise problem?

Question

I have a 1995 GMC Jimmy with the factory Delco brand radio installed, no CD player, just tape. On FM, stations farther away have a "helicopter" like sound when the engine is running, but it stops when the car is completely off except the radio. I found a fuse that could have something to do with it, ECM BATT. When I remove this, the car won't start (it powers the fuel pump) but the helicopter sound has all but dissapeared. What could possibly be causing this weird noise. Also on AM, the radio picks up a large amount of electrical noise such as the engine/spark plugs, doors, lights, etc.

My second question would be, would it be worth it to replace the radio or is something wrong with my electrical system?

Answer 1

The noises like you state are usually from your spark plugs, spark plug wires, Alternator, bad grounds,and CB radio if you have one. You will want to fix what ever problem you have-- even if you want to replace your radio. There are suppressors you can get for your power wire, resister plugs and wires. also the fastest way to find out if your charging system is part of the mess is to unplug it or remove the belt. You may want to check the ground wire leading from the battery clamp to the body , and make sure it is still on --Also know at the "Tattle Tale" wire. The ECM power wire is for your computer. so with out it-- you would not pick up any ignition noise. Electric Control Module

Answer 2

You could use a noise filter. Radio Shack sells (or used to anyway) a couple different filters. A small FM radio filter for a little static and a larger one that blocks out engine noise. If they don't carry it anymore you could check at a car audio store like Friedman's Car Audio.

Answer 3

You are picking up electrical interference with the ignition system. You may try and replace the ignition wires. If that doesn't do it, then you may want to take it to a shop and let them get a look at it. good luck.