91 Miata High Jumpy Idle - Miata Forumz - Mazda Miata Chat Forums

NA (1989-1997) NA Miata discussion within. The MX5's first generation, the NA, sold over 400,000 units from 1989 to 1997.

91 Miata High Jumpy Idle

Old 02-11-2014, 04:49 PM
!!!! I NEED TO POST !!!!
Thread Starter
Join Date: Feb 2014
Posts: 2
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.
miatazach is offline  
Old 02-13-2014, 03:36 PM
sixshooter's Avatar
Join Date: Jul 2011
Location: Tampa, FL; Lake Jackson (Atlanta), GA
Posts: 1,901

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 03:39 PM.
sixshooter is offline  
Related Topics
Thread Starter
Last Post
NA (1989-1997)
07-17-2012 08:59 AM
Engine Upgrades
03-14-2012 09:47 AM
NB (1998-2005)
01-24-2012 11:51 AM
Off Topic Discussion
01-03-2012 05:11 AM

Thread Tools
Search this Thread
Quick Reply: 91 Miata High Jumpy Idle

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.