Ignition noise.

[Fred 86 GN]

Two different vehicles, same problem. My 86 GN with an aftermarket CD radio and my 90 Chevy K1500 pickup with the factory stereo, both have the "ticking" and high-pitched tone.

From doing a search, the primary causes seem to be:

-- bad spark plug
-- bad spark plug wire
-- bad ground
-- bad head/amp unit.

To fix the noise, should I ohm the plug wires first, then if they are OK run a dedicated ground to the chasis? How can I tell if a spark plug is the problem?

Any other steps that are recommended to fix the ignition noise?

Thanks,

 

[salvageV6]

Coupla questions.

Can you disconnect the antenna from the radio easily?

See if it still makes noise with it removed, yeah I know you might not be able to tune a station just see if the noise goes away.

Secondly is the noise there on tape or CD operation?

Could be coming in from the antenna lead.