What is your question?
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What is your question?
I have a 1991 Miata mx-5. recently it began to have a performance issue. It seems like its missing, Idles rough except when revved to about 1500 to 2000 rpm the it runs smooth. Let off the gas when the revs fall below 1500 it seems to run like it is missing again. It drives and seems to have power but runs like its missing till you coast and take the load off the engine. I changed the spark plugs. The set that came out...the two front were grey, the two back were black and sooty. The exhaust is clear not smokey. Any Ideas or suggestions would be appreciated.
Mar 1, 2015
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1 Reply
check your coil packs, undo the connectors remove from mounting bracket and clean all electrical connections to shiney silver, add dielectric grease to any connection points and ensure the mounting bracket has proper grounding connections aswell as the spark plugs themselves, ensure they're all tight with no leaks and add dielectric grease to the ends of the boots. always a good idea to replace the plug wires annually, i do mine seasonally i have a 93.