1994 Mazda MX5 clacking valves

Hi there,

Thank you for the donation,

IF you only hear this noise when acceleration it will probably be an ignition timing issue and the noise is engine ping and not valve rattle, (the valves will rattle all the time) adjusting the timing with out earthing out the check connector will upset basic setting, take the car back to the mechanic and get them to do a base idle & timing re set, start here.

Mark (mhpautos)