1993 Geo Storm idle control motor

1993 GEO STORM
150,000 MILES • 4 CYL • FWD • MANUAL
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The engine won't idle right; sometimes when I let off the gas coming to a light it won't drop below 2000/2200 fluxuating somewhat rapidly between the two, and after 20 seconds or more it will finally drop to normal, but then (sometimes) fluxuate between 500/1000.
Sometimes it will race from a normal idle up to 2200 then back down to normal with a real jerky ride.
I put a new ICM on, and it wouldn't drop below 4200 so I returned it, and put the old one back on.
I don't know what to do without spending a bunch.

Thank You
Jun 12, 2010 at 2:21 PM
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RASMATAZ
  • ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Clean and test the idle air control valve and the throttle position sensor.
Jun 13, 2010 at 5:38 AM
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