whats going on HT, i currently have a ruff idle when i pull up to a stop sign or light and press the clutch to go in to neutral, the idle drops down to 500 or 600 rpms and pops up quickly to normal idle . Im thinking the IACV is a little dirty and getting stuck. I was wondering if you guys had any tips on removing the bottom bolt on the IACV, it seems the the fuel rail is in the way. do i have to remove the fuel rail to remove the IACV??

Ps. i have a 95 prelude with a jdm h22a

 

The function of the IACV a.k.a. Idle Air Control Valve is to adjust the idle based upon the amount of air entering the engine, then the computer reacts to this information by adjusting the cars rpm.

Reasons why you should take it apart and clean it:
-High idle after your car warms up
-Lumpy idle
-Roaming idle
-Hunting idle
-Fluctuating idle

Tools Needed:
Ratchet
12mm Socket
Pliers
Brake Cleaner or Simple Green
Paper Towels
A cooled down engine for at least 2 hours

1) Now you got to locate where the IACV is, pop your hood and it’s located directly behind the intake manifold. It’s actually connected to it. Remove your intake and strut tower bar. (If applicable)






2) Place a couple of rags underneath to catch the coolant spill. Loosen the two hoses running to the IACV with your pliers by squeezing the two clips and moving them away from the end, circled in yellow. DO NOT cut the hoses as they are the exact length and you will have to buy new ones if you do.

3) After doing that remove the harness connected to the IACV on the driver side, circle in blue.

4) Then to finally remove it from the intake manifold, remove the two 12mm bolts, circled in red.



Now that the IACV is removed from the intake manifold make sure that you do not lose the rubber gasket as you need this so that it does not leak after you re-install the IACV.

5) Take your brake cleaner or simple green and start to clean up the inside of the IACV by spray inside the two holes. Continue to do this until no more dirty fluid comes out. Should take anywhere from 5 minutes to 15 minutes. This depending on how old and dirty your IACV is. The gasket can be seen in this picture as well.




6) Once you’re done cleaning out the IACV let it air dry. I let it air out for 20 minutes while I did other maintenance on the car.

Now your ready to re-install it back on the car so follow the steps backwards from 5 – 2

 

Where is the Iacv located on an h22a in the front of the Intake manifold near the fuel rail right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LukieLuc &raquo;</TD></TR><TR><TD CLASS="quote">Where is the Iacv located on an h22a in the front of the Intake manifold near the fuel rail right?</TD></TR></TABLE>

yes

 

i wanted to know how to remove the bottom bolt on my iacv cause its very close to the fuel rail and i cant get a ratchet in there

 

pretty sure you just have to take the fuel rail off, or pull off the upper plenum.

 

I did this last week. Fuel rail does not have to come off. Just take the couple bolts out, unplug the connector and lines. The bottom bolt is a squeeze, once it's undone, pull it out and push it slightly toward the bottom to clear the rail. About 2min worth of work.

EDIT: what engine is those pics. Looks like the iacv is on the back of the plenum in that one.

 

It must be very different from the H23, because although I can't fit a socket down there, an old fashioned open ended wrench works fine

 

yeah you for sure dont have to take off anything else, open end ftw!

 

does the IACV have anything to do with gas consumption?