First need to check your shop. Doubt a timing chain would go this early in life. A person on the Miata.net had a similar problem and after a lot of false proclamations like timing chain and blown engine, etc., it turned out there is a internal valve in the intake manifold that can fail, causing this type noise. One other thing to check is change brands/grade of gas and see if it changes. Lots of crumby gas with too much alcohol floating around. Don't panic and throw in the towel too quick.
|