Ok on this 02 suzuki vitara 2.0 engine: have this vibration noise or rattle sounds like a heat sheild broken or loose ive check the exhaust all the heat sheilds cant find any loose or broken. when i start the engine and it begains to idle i hear noise sounds like under the valve cover or front of engine. i can by hand reach over and manualy turn up the idle and its when i can hear all that vibration i did change the belt and tenison pulley, idle pulley was ok i turn all pullys by hand and they seem ok didnt feel or hear, noise or roughness