Rb26 High Idle After Cold Start

[Sarumatix]

Hey guys,

car's been running fine (although idle aways sat up at 1000 ) anyway today driving to work I got a few kilometers down the road and pulled up to some lights and the idle dropped down to 1500 or so instead of the usual 1000. For the rest of the trip it stayed at 1500 idle. When I drove back home this afternoon it started up and idled fine however again after the car warmed up the idle went back to 1500. Any ideas?

[Sarumatix]

Wow no suggestions at all?

[MBS206]

So you start the car of a morning, and it idles at 1000RPM when cold.

THEN

Once warm it USED to idle around 750RPM? but now it's idling at around 1500RPM?

By the sounds of things, as the metals are warming up, they're expanding, which can usually BLOCK air leaks, but it might be causing one for you.

Check for vac leaks.

[WogsRus]

Couple of things.

1)TPS not set correectly, i assume GTRs have them aswell

2)Water temp sensor bugared

3)Cold Start Valve not closing

4)First Idle Controll Device, FICD, solenoid, not working (as is the case in my car)

5)A vacuume leak somewhere.

[SLIPPERY]

maybe throttles got a little gunk on them somehow and werent sealing too well when closed, hence sucking in a little extra air

[Sarumatix]

Yeah I thought it was the throttles however by reving the car around a bitter and playing with the throttle nothing seems to be wrong, futher the idle is very reliable at 1500. It hasn't been a progressive change.. it just happened yesterday while driving.

[Betz]

IAC valve

mine is stuck open and my car idles at 1200rpm all the time (and its annoying)

there is a thread on how to clean it to stop it sticking, do a search..

hopefully its not munted as nissan wants around $900 for them

[Sarumatix]

Cheers there is a thead in DIY http://www.skylinesaustralia.com/forums/in...mp;hl=IAC+valve

but all the pictures are dead .