just finished my mini me y7/y8 i also have the cold air assist set up too so maby thats why but my idle on cold start rises up to around 2k for a while then drops down to about 1500 not sure why but is this normal for the 99-00 d16y8 with the cold air assist valve?

i have a video it cut off short though

https://m.facebook.com/story.php?sto...id=20531316728

 

I don't know about the 6th gen with cold air assist.

The 5th gen (92-95) uses a Fast Idle Thermo Valve that keeps the idle at about 1500 RPM and drops it down slowly to 750 once fully warm.

If your cold air assist is the same sort of idea, it should act similiar just not sure the RPM ranges it should be operating in. 2000 RPM does seem a little high but I am also used to my 5th gen civics so not really sure there.

 

What ECU?
Any check engine lights?
Are you auto or manual?
Is your manifold an auto or manual one?
Did you use the correct intake manifold gasket?
Clean your IACV?
Set the base idle and adjust the throttle cable tension?

 

y8 99-00 manual ecu
y8 99-00 manual intake manifold and gasket
cel if for secondary o2 sensor not hooked up yet
almost posative the head is a 99-00
i cleaned the iacv prior to install
i bought a new y8 throttle cable put it on to where it seemed good im not 100% that its in the right spot however

a few mins later the idle will drop down to 1500 then slowly drop down to operation temp.
just thought the high rising idle to 2k was a bit strange for a while

 

using my y7 harness wired up new knock sensor vtec soloined and switch did the 3 to 2 wire iacv.. new idle air assist valve going to intake.. ichanged the pcv valve for the y8...
reused my y7 iat sensor maby i need the y8 one?
everything i bought new from honda
blocked off cruise control hose with a screw

 

I had this issue. It's either a vacuum leak or the FITV. I would do the FITV rebuild first. It's very easy to rebuild the FITV.

 

there is no fitv on a y7/y8.. its the cold air assist valve i think? i bought it new from honda attached the hose to my intake ill take pictures later

 

maby theres still air in my colant?

 

heres some pictures i thought the cold start assist valve was leaking but i dont think it is its pretty tight in there i turned it one more time around but i dont think it made a difference

 

https://www.facebook.com/video.php?v...69&pnref=story
https://www.facebook.com/video.php?v...53&pnref=story
https://www.facebook.com/video.php?v...28&pnref=story
https://www.facebook.com/video.php?v...28&pnref=story
https://www.facebook.com/video.php?v...28&pnref=story
https://www.facebook.com/video.php?v...23&pnref=story

heres some videos of cold start ups and when i tap the throttle it hangs up..
it deffinatly seems like a vaccume leak some where but i sprayed carb cleaner everywhere and soapy water and i dont hear any leaks nothing really happend

 

well i figured out why my rpms were hanging i think it was because i still had air in my coolant.. however the high idle cold start is still doing it

my friend said it may be because i dont have a o2 sensor plugged in so once i get that well see.. im going to get a vaccume pump guage and check the cold air assist out and get a timing light to put the finishing touches on.. i checked all the live data on my scan tool everything was in spec