> Thanks Chris, I am very well be confuse, I don't even know about HLA,
> I will do fresh oil change and fill up with high octane right away.
>
>
>Don't bother with the high octane. If it hasn't helped, you're throwing
>(lots of) good money after (lots of) bad! You can read up on "HLA Noise" on
>miata.net along with anything and everything about miatas. HLA stands for
>Hydraulic Lash Adjusters but they are commonly referred to simply as
>lifters. The miata's tend to get "tired" and get a bit noisy. It's not as
>scary as it sounds, they'll go on and on and on.

Good luck,
Chris
99BBB