b18c1 cold idle problem

[07Speed3]

Engine is a b18c1 using a vafc 2 for a fuel controller. It idles at about 2700 rpm when you first start it up (cold start), then when it starts to warm up the idle will fluctuate between 1200-1700 rpm, then finally after it warms up, has a perfect idle around 800.
Any ideas what could be causing the problem?

[07Speed3]

Think i may have found out what the problem is...
http://www.honda-tech.com/zerothread?id=1564019
Gonna give it a try.

[dizzystar]

if anything, I would look into replacing the hose that passes coolant underneath the throttle body, it was pinched once, I fixed it but didn't buy a new hose and that could be a problem.. but I doubt it since if that is plugged the idle will NOT drop past 1500rpm for more than 30 seconds at every stop light. just a thing to check.

[BoostLover]

Had the same thing happon on my lude. There is an iac that controles cold idle its the smaller of the two on the throtle body. There is a plastic diaphram that backs off over time. Remove the valve and screw it in clockwise. should stop the serging idle.