i have a d15 stock engine. and when the car is in park or nutural the idle jumps from 1500 to 2000 when it is in drive/reverse gear runs fine but idle is high 1200 @ stop light.
i just replaced the iacv brand new from honda...and problem is still existing, also replaced and refilled coolent.

do any of yall might know what the problem is? fast idle valve? sensors?
please ask anyone that u know that might know the prob inspecton is due and it aint gonna pass like this

 

definately check the fast idle valve

 

Check for any vacuum leaks, especiallt through the brake booster first, then the FITV.

 

ok ill check for vacum leaks tommorw...but where is the fast idle valve located? and is there a way to clean it? maybe a how-to thred on it yall could link me to...thanks very much for yalls help!

 

the fast idle valve is connected to the other end of the throttle shaft, isnt it?

 

It's underneath the throttle body. Search posts from Nerologic. He posted a step by step cleaning process.

 

thanks guys i went out and cleaned the fast idle valve...and the idle still was jumping so i checked around for a bit and lo and behold it was the pipe to the pvc pipe was torn..and the pvc was clogged...replaced the 2 and wa la...fixed! at 12:30am while neighbors are sleeping...

 

if you could post some pics i'm havin the same problem... bout to swap out the iac valve.... pvc?? wat is that???and tps sensor??

 

well i have ppl tell me that it might be the

low coolent(flushed and refilled)
iacv(changed)
fast control valve (cleaned https://honda-tech.com/zerothread?id=699787)
or a vacum(sp) leak (spotted)

so i did the 4 and it was a vacum leak..

check the pvc valve and the pipe leading to it...start with the cheapest first