kangjin

Does anyone know what this does? (#13 in the diagram below)



Is this the same part that Hondata mentioned was a carryover from the Accord version and no longer needed since we have DBW?

I know that for a while I had the outlet (#15) disconnected (on accident) and my idle was really high...

I imagine it has something to do with the intake air temp and engine coolant temp and something being bypassed.

Thanks for any help..

moda_way

Under less than 131 F coolant temp, this valve should create a vacuum. Once you reach 131 F or greater, the vacuum should be zero. Its exact function prior to 131 F escapes me though.

kangjin

So it is functional on our car?

Cool. Thanks for the info!

junktionfet

I wonder if removing that would reduce the spike in RPM when the engine is cranked up cold. I hate hearing my poor bearings rattle around like that.

rmpage

Maybe to warm up the engine a bit faster? The HVAC unit starts the heater blower when ECT hits 125F, so it's right around that threshold.

Not sure why they screw around with a bypass rather than just using the throttle valve though.

aaronng

Are you using a PAO full synthetic oil? If you want to reduce the rattle, you could go for a hydrocracked synthetic or ester synthetic. Or even go for a good semi-synthetic and make sure you change every 6 months/7500miles.

moda_way

I had an idle control valve on my '89 and 93 VW GTi 16v's and they failed fairly frequently (made by Bosch).

junktionfet

I presently use "Honda" 5w30 motor oil. When I'm satisfied that the engine is fully broken in (or just broken), I plan to switch to synthetic. It seems that the engine consumes less and less oil with each oil change.

Switching to a synthetic oil would most definitely not totally eliminate the sound of a dry motor upon cold startup. However, the use of a good synthetic oil will help curb some of the wear that could occur during that time.

JTso

iTrader: (2)

According to the manual, the IAB is a thermal valve which routes air from the intake to the injectors when the engine is cold. The open/close state is regulated by the coolant temp. It might be used to keep the engine from running too rich during warm up as the primary O2 sensor is not used in warm up cycle.

rmpage

Well, that sounds a hell of a lot better than my guess!

kangjin

Is that in the service manual? I must have missed it. Thanks!

96acuraguy

Anyone ever had the cap break off the trio of bracketed IAB's?