Dear Jim,
Thank you for contacting Mazda North American Operations. I appreciate
the opportunity to respond to you.
I appreciate and understand your inquiry.
My goal is to make your ownership experience an enjoyable one, and so to ensure this I have spoken with our Product Support Engineers regarding your inquiry. They have advised that the fix will involve a re-flash of the PCM. Please understand, all modifications need to be evaluated and approved by the Environmental Protection Agency (EPA), and we are just waiting for their clearance at this point.
I can assure you that the valve chatter your experiencing, on a cold start, stops once the coolant in the engine reaches 147 degrees. Depending on the weather conditions in your area, this is a matter of seconds. Also, this doesn't affect the durability of the engine in any way. I do apologize for any inconvenience this may cause you.