1993 buick century. motor noise started coming out of the speakers even with volume turned down. car is all orig.
Is this a loud buzzing/hissing sound while the motor is running? Sounds like a bad ground. The sound is alternator noise back feeding through the system. Most comonly heard through your tweeters (high frequency smaller speakers). Are you running an amplifier to your speakers at all? If amped try a noise filter on the positive lead (will have instructiions on installation). Check all grounds for solid connection is more then likely the cause
You may have a short in one of your speaker wires, or your antania
SOURCE: 1993 buick century. motor noise stsrted coming out
spark plugs been changed ? cheap plugs can cause this. spark plug wires ok? broken spark plug wire can cause this too or one just arcing to ground pass a loose boot raise hood after dark and run motor watch over all wires to see anything noticeable. Dont touch anything while running or things could go bad for you fast... some electric fan motor have a filter bolted to them this could be? does it vary with the engine? or stay one level? if all else fails it might be easyer to pick up a filter and install it in the power cable to your radio?
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