I have installed an HF mobil radio in my cruiser and am trying to get rid of ignition noise. I have done a test to locate the really hot spots which are reradiating RFI and the two most troublesome areas are the distributer and spark plug wires and the ECM unit under the passenger side dash. I have installed ferrite rf chokes on the four sets of wires right at the plugs, and then I ran copper braid ground strap from the chasis of the ECM to the metal kick pannel. However, I am still getting the spark noise from the ignition system. I have run ground strap from both hinges on the hood to the front quarter pannels, and strapped all four doors to the body, including the rear hatch to the body. Additionally, I have run solid 2.5" copper straps from the four corners of the full length roof rack to the body via the screw holes left from the factory rack. I have done everything I can think of except changing the ignition system.
My question is this... Are there spark plugs I could install (like the resistor type) that would help improve this situation in addition to perhaps a better protected spark plug wire set? I have also read that it might be a good idea to replace the distributor cap but isn't the spark electronically controlled therefore eliminating poor contacts?
Please anyone help to suppress as much of the interference as possible.
Thanks
Mark
My question is this... Are there spark plugs I could install (like the resistor type) that would help improve this situation in addition to perhaps a better protected spark plug wire set? I have also read that it might be a good idea to replace the distributor cap but isn't the spark electronically controlled therefore eliminating poor contacts?
Please anyone help to suppress as much of the interference as possible.
Thanks
Mark