Originally Posted by Jesshaines

hi, if theres anyone still out there in this long dead thread - im having this same problem with ring in wrong position. How did you end up resolving this? Ive checked three sites and all have same part. Do you know correctbpart number? Thanks

Originally Posted by ezone

The next post of his said a gasket from the dealership solved his problem.


Here's a site with a parts catalog you can look up your exact car and get your own part numbers

http://www.hondaautomotiveparts.com/

Originally Posted by sql_civic

You may have accidently mixed up the plugs that connect to the IACV and TPS. They are the same sized plug and will cause a rough idle if not plugged into the correct connectors.

Originally Posted by steveT

Okay, I know an old post. I have battled the idle issue for 6 months and replaced parts and fixed vacuum leaks like like the rest of you. Bottom line it is the IACV that is your problem. Buy an original Honda part. I bought two after market ones and problem still there.
D16Y8 motor MT place tinfoil between IAC and throttle body. Adjust idle screw to 550 RPM base idle. If that works then then the after market IAC is crap. If you do not want pay 2 to 3 hundred dollars for the OEM part then try this. Place two 1/16 to 1/8 holes in the foil where the air ports are and bolt back together. I used aluminum flashing and made an interface plate. The problem is the cheap ebay after market IAC's do not fully close which is why even with your idle screw all the way in will not reduce the idle. Yah you can retard the crap out of the timing to make it run and not throw a code but gas mileage and performance is crap. My old 1999 civic has great performance and is getting great mileage without replacing the china knock off IAC.
I only registered to pass this along since I had such a tough time and noticed too many unanswered posts on fixiing the problem. Don't get me wrong, I did have bad intake gasket, PCV hose and another vacuum line.
I changed the IAC twice with non OEM. I learned my lesson. Also tried an after market knock sensor too. Nope bad move. Pain in the neck to change and not worth doing twice.Hope this helps you folks that never got a final answer.

Originally Posted by 33Strings

I'm not sure if what I'm experiencing with my 2001 Civic is a similar problem or not. I will drive it and from time to time it will suddenly feel as though the RPM's went up even though the tachometer doesn't show any jump. At the same time I will have a large drop in power to the point I can't really get over 20-25 mph. If I park it and let it sit for about 20-30 minutes it then runs fine. It idles roughly when the problem is occurring as well. I stopped using the a/c in the car and noticed it went away but then when I drove out of town yesterday (1.5 hours round trip) it happened again even though the a/c was off. I'm not getting a check engine light. The temperature gauge on the car was fine but it smelled like something was hot when I got back. I had to get to work so I didn't have time to take a look right then. (Drove other car to work.) Any insight would be appreciated.