Question about 1992 Mazda MX-5
Are your plug wires fresh? Hows bout the plugs? Have you checked your O2 sensor lately?
I know that when an engine is cold on older engines the choke valve is not working properly this is a little different because everything now is electronically controlled on the emission system. Tune up would be my first thought replace the plugs and wires. When you pull the plug wires see if they have oil on them. The sputtering could be caused by poor contact in the plug wires.
Inspect the ignition system and replace the plugs and wires. I had an oil sooked wire and my engine would not idle well until it warmed up. If you notice oil you will need to replace the valve cover gasket.
I have this problem still and have only had mine for about a month now and it is on my to-do list of stuff. The new plugs and wires helped. They are sealed with the silicone wire sealent purchased from any auto parts store and the oil does not get up into the contacts yet.
If you can scare up a paper clip somewhere you could check for a stored code. You might wind up with a 9 (water thermister) or 36 (idle speed control valve), or something completely different, or maybe nothing at all, but it only takes a few minutes, and it might keep you from willy nilly cleaning/replacing parts that are irrelevent to your problem. Scanned the ECU to know any code stored there.
Keep us updated.
Posted on Nov 15, 2010
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Posted on Jan 02, 2017
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