91 Miata High Jumpy Idle - Miata Forumz - Mazda Miata Chat Forums
Miata Forumz - Mazda Miata Chat Forums
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NA (1989-1997) NA Miata discussion within. The MX5's first generation, the NA, sold over 400,000 units from 1989 to 1997.

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Old 02-11-2014, 03:49 PM   #1  
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Default 91 Miata High Jumpy Idle

My Miata has recently been going into a weird idle cycle where it will idle up to 2000rpm and then sit there and bounce from 2000-2100 over and over. It does it randomly and isn't consistent with it being cold/hot. Some days it won't even do it and idle right at 900rmp and others it won't idle correctly at all. Wondering if you guys have any ideas about what would be causing this and what I could check? Searched but couldn't find any threads that addressed an issue like this. Thanks in advance.
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Old 02-13-2014, 02:36 PM   #2  
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Location: Tampa, FL; Lake Jackson (Atlanta), GA
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IAC valve sticking? Or one of the little vacuum switches has a line leaking when it is switched open. Or maybe the temp switch is starting to fail and telling the engine to go into warmup enrichment.

Last edited by sixshooter; 02-13-2014 at 02:39 PM.
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