Ignition Noise

The most effective method for evaluating ignition noise is to compare the radio chassis performance with the engine on, versus off. If ignition noise is present with engine running:
- Check to see that the ignition wires are the suppressor type and that the spark plugs are the correct resistor type.

Missing or Damaged Noise Suppression Components
- Noise suppression components may be damaged or missing.
- Check radio frequency interference suppression bond grounding effectiveness by wedging a large file between metal parts to make sure of proper ground, such as between the tail pipe and body or between the fender and frame while radio chassis is playing and engine is running.
- Listen for a decrease in the objectionable radio chassis noise. If a reduction in radio noise is noted, first try tightening body and exhaust system clamps and brackets. Then, if necessary, install a new radio frequency interference suppression bond between the two metal parts to make sure of proper ground.