First off, the code you're getting (P0505) same as CEL 14, is not IACv like how it says in the FAQ's stickied in here, Club Si, etc...
P0505/Code 14 is Idle Control SYSTEM malfunction, not IACv.

Possible Causes:

-IACvalve mechanical malfunction
-Throttle body clogged port, improper adjustment
-Intake manifold gasket leakage
-Intake airhose loose leakage
-Vacuum leak
-ECT sensor incorrect output
-Throttle Posistion Sensor incorrect output
(for the TPS incorrect output, this might be only for motors made in '96)

Try an check these things.

Start the motor, hold rpms at 3000 until the radiator fan comes on, then let it idle.
Check TPS, with the throttle fully closed, the TPS should be around 10%
(coolant temp should be around 200 degrees, give or take 5 degress or so.)

if your idle is above 550, check for vacuum leaks. Take the intake off, put your finger over the lower port in the throttle body. if the idle doesnt drop, check for vacuum leaks, make sure the throttle valve is closed completely.
if the idle does drop, adjust the idle speed. if you cannot adjust, replace IACv.

if the idle is less than 550, do the following:
disconnect the connector from the IACv.
(for A/T, d167y) if the engine speed doesnt increase, replace IACv. if it dies increase, adjust the (base) idle speed, clean the ports in the throttle body as necessary.

(for B16A2, d16y5,y8)if the engine speed drops or stalls, adjust the (base) idle speed, clean the ports in the throttle body as necessary. if the engine speed doesnt drop, or doesnt stall, replace IACv.

Do these before you decide to go down to Honda and spend $290 on a new IAVc and you dont need it. But if you do, i have one, brand new in box that i cant return, so its for sale.

Modified by i. at 4:11 PM 10/16/2007

Modified by i. at 4:13 PM 10/16/2007

Modified by i. at 7:19 PM 10/16/2007

Modified by i. at 7:22 PM 10/16/2007

thanks

but mines not throwing a code and it works fine after i bump start the car

2006 RSX Type S

Quote, originally posted by spintboy »

So simple green AND elbow grease? In that order? Is it really necessary to use both?

Quote, originally posted by shortlid »

Yes, a good soaking will fix a REAL gummed up IACV right-up. Glad it worked!

I only sprayed carb cleaner every couple of minutes didn't work. I will try to soak it tomorrow, thnxs

Got a p06 ecu which from what I've read is for a '92-'93 Civic/DelSol.
Will that ecu be ok? Or should I look for a p28 regardless?
Or any other ideas.
Keep in mind...car is still needing to get registered and then inspected.

Hmmm...
Also there 2 wires sticking out that seemed to have been cut off.
Not sure if it has to do with the IACV or whatnot.
I am typing this on my phone therefore I won't be able to upload a pick of it or my rpm gauge.

Please if you can help. Email me at rawrz@tmail.com for it.
If possible upload it for others to see and post there opinions.

Thank you.

Correct me if I am wrong, but isnt the lower port for the FITV? Shouldnt that be closed if the engine is warm? so should the vacuum change when plugging the lower port?

I pulled both the FITV and IACV off last night and cleaned them. Now I get the code every time I drive. I am going to check to see if I have any new vacuum leaks after work, those o-rings and seals were pretty old and I didnt have anything to replace them with.