I had these repairs done: timing belt/tensioner/replaced sparks plugs and now all of a sudden Ping/knock and I use 89 octane gas work was done 7/08
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1996 Mazda Miata MX-5 Question: ping/knock
Answer #1Bret Bodas from RepairPal Test Shop, November 03, 2009, 15:45Master
You should try getting new fuel, you may have gotten a bad tank of gas. If that appears OK, get the diagnostic trouble codes checked, see if there is a problem in the fuel/ignition system. Let us know what you find, post codes if you have any and we can direct you further.