Every time I rev my engine or slightly press the gas my speakers/radio make a whining noise that gets louder and higher. Has anyone had this. Why is it happening?? thanks!

 

89 XJ?

Check the bonding strap that goes from the firewall to #14 cylinder head bolt for corrosion at the firewall attachment, and verify security and cleanliness of attachment at the cylinder head bolt.

 

did you install an amp for your door speakers? if so, clean up your grounding point (wire brush to clean metal) .. unless it's an older pioneer radio, a which point you're boned. lol

 

Like uber said, if you've got an amp, check your ground connections (both at the amp and at the body) to make sure they're clean and tight. Also check your battery terminals to make sure they're tight, as well as the battery ground to body and the engine ground strap. If you're still getting noise, consider upgrading your battery negative, engine ground, and alternator positive (1/0 or 4-gauge).