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idling problem

 
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Old 01-16-2008, 11:15 AM
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idling problem

Hey im new to the forum,I have a 1990 prelude si. when i start my car it idles normal then after a couple min. it revs up to 2000 then drops to 1500 and it keeps going up and down. any idea?

thanks,
Steve
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Old 01-16-2008, 11:22 AM
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It's called "idle surge". Happens sometimes in cold weather or if you're idle adjusting screw has been messed with. Sometimes mods will effect your idle too. Your throttle body or manifold may need to be cleaned as well. With it being a 90 model, i bet there's some carbon build up.
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