People here have reported at times that they had to
completely replace this part.
Before you replace it, see if a thorough topping off and air
purge of the cooling system fixes the problem. Follow the
manual's directions to the letter on this. The IACV has
cooling passages and they are high spots on some cars.
Improper cooling = improper idling. I had an idle problem
with my 91 Civic, and a proper purge fixed it right up.
See also the idle troubleshooting procedure in the 97 Civic
http://www.honda.co.uk/car/owner/workshop.html . It's under
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