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'95 Deville with OEM radio. In areas with weak AM radio signal, interference (static) occurs only below 7 miles per hour:cookoo: .

Hypothesis: When the time constant on the suspensions system changes at 7 miles per hour, the emitted interference causing the static is elimiated. "Emitted" interference is suspected because the problem occurs on a walkman radio set too.

Has anybody else experienced this problem? What can be done to reduce the effect of the interference?
 

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krimson_cardnal said:
check plug wires if not ac-delco replace them with the original spec wire set.
:yeah:
Plugs too. The wrong plugs will cause noise as well.
 
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Thanks for the plug suggestion. But------. There is no problem while the car is idling.

I stated the problem wrong, it only occurs at speeds ABOVE 7 MPH and comes in like a switching action as the speedometer changes to 8 or higher and goes away when it reduces to 7 or below. I am sure that it is radiation from the electronic system with the shock absorbers. That system has a damper change at 7 MPH.
I don't know if it is the wires running near the antenna wires or a radiation from the box itself. No--- I'll correct that. In fact, since it affects a portable radio also, it must be in the air.
I have lived with the problem for 7 years or so.
 

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do you have the stock [ac-delco] plugs and wire set installed on your car. not that it will idle rough, but the resistance in these items will preclude radio interference. check em.
 

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Bluishc said:
'95 Deville with OEM radio. In areas with weak AM radio signal, interference (static) occurs only below 7 miles per hour:cookoo: .

Hypothesis: When the time constant on the suspensions system changes at 7 miles per hour, the emitted interference causing the static is elimiated. "Emitted" interference is suspected because the problem occurs on a walkman radio set too.

Has anybody else experienced this problem? What can be done to reduce the effect of the interference?
My '95 Concours does this too, (FM) I hear it thru the speakers.
Mine is more of a whine sound.
Have you found the solution yet?

Ed
 

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You might try grounding the tailpipe to the frame. This works well for a number of vehicles with radiated R.F. emissions. Also old coaxial cable braid can be connected between the deck lid, hood, fenders and doors to a good low impedance ground. The R.F. grounding on body parts can be pretty dismal with things like plastic wheel houses. Use the shortest run possible. If that doesn't work then I'm sure more stuff can be grounded. I'd get a schematic and start installing bypass capacitors at the BCM Voltage source. The AM broadcast band should be low enough to escape any computer related clock noise so you are probably right about it being a duty cycle situation.
 
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