Mazda Miata (MX-5) This compact RWD model, offered with many engines options for those are who want to cruise with the top down in a base model, or hit the track in one of the high performance models, has been a popular model since its introduction.

Miata valve noise

Old 08-27-2011, 12:08 PM
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Join Date: Aug 2011
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Exclamation Miata valve noise

I have a 1990 Miata with 200,000 miles. I have been having a problem with what I think is valve clatter mostly upon start-up after a run at highway speeds. The clatter would last for a few seconds after a start-up when the car sat a few minutes after a highway run (like when I stopped for gas). The problem would not occur if my Miata was allowed to cool. I believe valves and injectors are clean because I run 44K by BG Products through it every spring.

First I tried an oil additive that was supposed to clean the valve area. Then we ran 20/50 oil in the summer. What seemed to work until recently was 5/40 synthetic oil with STP (I could get 3000 miles out of an oil change without the problem). I just had the oil changed and I am getting the clatter worse than I have in a long time.

I am looking for ideas to try now. Thinking of just changing the oil again to see if that helps. Looking forward to your suggestions.
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