Question about 1991 Geo Storm

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When my 1991 geo storm warms up the idle skips around.... it doesnt stall out it just sputters and gos from high to low idle

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Sounds like your idle air control, or IAC valve. Take it off and clean it out with some brake cleaner. Carbon deposits and gunk can build up and prevent the IAC valve from operating properly, by causing it to stick. If cleaning it doesn't work, you may have to just replace it. It happened to me on my Sentra, tripping my check engine light, sputtering hard, idled crazy, no power, etc. But once I cleaned it off, it ran so smooth. You'll need to get a replacement gasket, though, or make your own out of gasket paper.

Posted on Feb 04, 2010

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Posted on Jan 02, 2017

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I have a 93 geo storm wit high idle when cranked an even while running fo to slow down again wit the idle high what do i do?


i cant understand that but got BAD idle.
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bad idle can be 1 of 2 things.
ISC sticking.
or engine runs so bad the ECU can NOT control idle.

clean the ISC, if not that
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When i start my 1997 Geo Metro, it often sputters


Try this
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1991 geo storm stalling at idle


maybe try replaceing the ingnition modual. that part can do a lot of weird things to these cars. its located inside the distributor cap, really easy to do. about $40 and 10 mins or less. sometimes as they start to fail they do odd things sometimes but not always

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