Hi,

My 2002 Odyssey had the engine light on. Auto zone said it was for the idle air management valve. Replaced valve. Engine light went off for a while. The idle is surging however. Thinking of putting the old valve back on. My interpretation is that there some electrical problems causing the idle air valve to be cycled but my old valve didn't work so it didn't cause any performance issue. Does anyone have some experience with this.

Thanks
Bill A

 

Initially I had re-installed the throttle body gasket incorrectly. I managed to get another gasket today and fix that problem. I still have the surging problem however. If I put my finger on the inlet to the idle air valve it stops the problem. Possibly have some electrical issue. Saw some posts somewhere about the power steering sensor by the passenger tire and associated wiring. Not sure if there are any other possible problems. I am leery of going on a wild goose chase. Possibly it's time to take it to someone who has more experience working on this issue.

Am I posting in the correct location. Received 187 reads but no responses.

Thanks

 

Honestly sounds like you have no clue what youre doing... Not trying to be harassing, but you should probably take it to a reputable local shop.

I would start by checking for vacuum leaks.

 

do you have water lines going to it? did you bleed the coolant after reinstalling them?

 

Hi, It's working although I am not completely sure why. Here is a useful link I found during this adventure.

http://ww2.justanswer.com/uploads/th...c_1129_tsb.pdf

That's the 2008 Honda service bulletin for surging Odysseys and Pilots. It's interesting to read. Not sure why they focus on erratic power steering sensor values but don't say much about what the power steering sensor values should be. The sensor appears to be a simple open/closed pressure switch.

The pressure switch is Wells / Airtex 1S1769. The web page doesn't have a data sheet but go here

http://ww2.justanswer.com/uploads/th...c_1129_tsb.pdf

and manipulate the page with 1S1769 and at least you see a picture. I called their support line and they were very helpful (even though I was one guy fixing my car, not GM).

Anyway, I jacked up the van, took off the passenger side wheel, and barely could reach the sensor. I took unplugged the sensor and tried running the van. There was some initial surging (less than before). The second time I started it, it didn't surge, I gave it enough time to do the 3 minute idle cal process. Now it seems to run fine. Idles 500-700. Seems to run better than before, probably because it has an IAC that actually works.

It should be noted that the 2002 Odysseys don't have the fast idle valve, only the IAC. There is water running thru IAC and throttle body for anit-icing purposes but it doesn't have the FIV/heating/idle speed impact (like it does on the older Hondas). I can rail the steering to either side while moving, stopped, or in reverse. Since the IAC works I am not driving around with the check engine light on. I also notice that with intake off the suction in the IAC inlet is less. Somehow having the power steering sensor connected causes problems.

I ran the engine connecting and disconnecting jumpers to the sensor input lines back to the computer. It doesn't seem to do anything. One could interpret this as the lines being open. It's strange to me that Honda references erratic sensor readings but doesn't seem to worry whether the switch is always open or always closed. Possibly their software can deal with a stuck sensor but goes open loop if the sensor input is bouncing (causing the IAC to be wide open all the time)

Presently I am planning to just tape off the sensor and connector and leave it the way it is. I don't want to monkey with the harness and create more problems.

Beyond the infamous power steering sensor does anyone know what other engine control functionalities use the IAC? Having a functioning IAC seems to make the car run better.

Thanks to those running this website. Some of the other threads mentioned the power steering sensor and I bumbled forward from there. I am much better at removing and installing my throttle body than I was before!

Thanks everyone.