Docwemple
Docwemple HalfDork
8/20/23 9:34 p.m.

Looking at a 2000 but it recently began making top end noise, according to the owner, and down on power. No CEL. Thoughts??

Docwemple
Docwemple HalfDork
8/20/23 9:35 p.m.

...Miata... auto correct didn't catch it.  SMDH

Keith Tanner
Keith Tanner MegaDork
8/20/23 10:04 p.m.

I'd want to narrow down "top end noise". 

Docwemple
Docwemple HalfDork
8/20/23 11:19 p.m.

In reply to Keith Tanner :

Me too. Hell, vs bottom end even. He says it happened pretty quickly.  Obviously not mechanically inclined. Just not sure if it was something Obvious. Without the noise, I'd be thinking timing,  maybe 

nuthunmuch
nuthunmuch New Reader
8/21/23 9:53 a.m.

The engine uses shim over bucket, so maybe it spit out a shim? If that were to happen I'd be concerned about collateral damage to the camshaft and valve.

Pulling off the valve cover to take a look should be a relatively quick job.

Docwemple
Docwemple HalfDork
8/21/23 1:01 p.m.

In reply to nuthunmuch :

Hadn't thought of that. Great idea. 

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