Cold Start Issue

[BensDR30]

AFAIK, the IAC is a solenoid and the AAC is a stepper motor, but I need to check my workshop manuals to be certain (it's been a long day)...

[QWK32]

they are both the same thing. just one valve doing the job of two. its proper name as listed in the workshop manual is IACV-AAC Valve. its doing the job of the idle air control and the auxiliary/accessory air control.

here is a page from the R34 workshop manual that shows some troubleshooting for different engine faults. issues with cold starting is listed. i know S1 isnt the same as R34 but its still basically the same thing.

[BensDR30]

[66yostagea]

I have an R33 manual on disc. Page EN284 sheds some light. Gotta get to the good oil on this as it is really bugging Mrs. 66.

[kidafa]

well hugh care to share with us? Where did u get ur manual?

Ben what are you doing on thursday?

I'm keen to clean both those valves on thursday... Anyone done them? How hard is it?

[QWK32]

Beacuse your car idles fine once its started it probably not the AAC valve, but becuse it's a quick job, 30 min, it would be worth doing anyway. It just unbolts off the back of the plenum, then when its out carefully pull the valve apart remembering how it goes back together, and give it all a good clean with some degreaser or carby clean. There is a good tutorial in the DYI section that would be worth having a look at before attempting.

Edited August 3, 2009 by QWK32

[66yostagea]

well hugh care to share with us? Where did u get ur manual?

Ben what are you doing on thursday?

I'm keen to clean both those valves on thursday... Anyone done them? How hard is it?

Its on disc, I think I got it from Tangles. I may be able to do a copy, will let you know later.

[Munkyb0y]

you can download the R33 Service Manual here: http://rapidshare.com/files/186152199/524.pdf

[kidafa]

ryan where is this valve thats in a prick of a position you speak of? Is it even worth me doing the other one if it did nothing for you?

[66yostagea]

Now I am REALLY con effin fused.

[_Ryan_]

you can prime the pump a few times before starting to rule out check valve, mine does it, i have done everything except the valve under the plenum... already done the thing at the back, AFM etc idle is perfect, just that cold start issue. done it whole time i have had my car and never failed me, but gonna chase it down before i sell...

[SiR_RB]

mine does the same thing, cold morning start up and the idle is rough and hunts around for afew seconds then piks up the revs to the 1500 (or so) then settles to 1200 or sumfin.

if i start it and hold the accelerator abit its starts perfect nice and smooth

its been doin it for a while. ive primed it several times before i start it but it stil does it

im gona giv this AAC valve clean a go and see what the results are

[SiR_RB]

oh and it doesnt do it wen the engine is warm or even if its been running for a few minutes after cold start up :S

[_Ryan_]

after cleaning thing at the back of plenum my idle just got smoother, but cold start didnt change, so guessing the valve under the plenum is the issue, flamin mongrel to get too though

[BensDR30]

well hugh care to share with us? Where did u get ur manual?

Ben what are you doing on thursday?

I'm keen to clean both those valves on thursday... Anyone done them? How hard is it?

I'm probably available Thursday night, but won't be leaving work until after 5. Saturday would be a better bet if you want to run some diags.

[kidafa]

Yeah im confused now.... Not sure what valves im meant to be cleaning tomorrow and where they are?

Yeah sat sounds good ben Im busy in late arvo but thats it.

Edited August 4, 2009 by kidafa

[kidafa]

Ok,

So i need to clean this :

http://www.skylinesaustralia.com/forums/Di...l&hl=idling (AAC Valve)

And this:

http://www.skylinesaustralia.com/forums/Ai...nce-t69151.html (Air Regulator)

Ryan, You talk of one being under the plenum and it being a Kent to get to.... which one is that? by the looks of those two it doesnt seem like either of them?

[-NismoR32-]

http://www.skylinesaustralia.com/forums/Ai...nce-t69151.html (Air Regulator)

Ryan, You talk of one being under the plenum and it being a Kent to get to.... which one is that? by the looks of those two it doesnt seem like either of them?

Hey mate

I'm sure that "Air regulator Maintenance DIY" is just for rb20's.

[QWK32]

there isn't one one the RB25 neo, its all done with the one valve. don't know about the R33/S1 RB25 though, have a quick look, on the RB20 its just under the throttle body.

[kidafa]

Dude this is confusing me even more!

Help ryan or kiwi!