Gt-r Idle?

[GodziRRa]

Hi guys!!

My GT-R is idling at 1050 rpm. Already cleaned the AAC valve before, butterflies were also checked... the car runs fine though. It's just the idle that keeps me wondering.

So GT-R gurus, is it just fine or there is something wrong w/ it?

Thanks in advance guys!

Edited September 27, 2010 by GodziRRa

[payback21]

Vacuum leak? Check all vacuum hoses to the plenum.

[GodziRRa]

What's the best way you guys suggest on finding a sneaky leak? And on your experience w/c part usually gets busted the AAC or the IAC valve? I tried turning the screw of the aac valve deep enough but the idle is still the same.

[StealthX]

aerostart or some sort of flammable spray, spray around the plenum when the idle changes, you've found your hot spot...

[Moodles2]

The ECU needs to be put into base-idle mode or else when you adjust that screw the ECU will just compensate.

[GodziRRa]

Thanks guys for the tips!!

The ECU needs to be put into base-idle mode or else when you adjust that screw the ECU will just compensate.

Really? I thought it's just adjust all you want w/ the idle screw. How do you do this base idle mode in the ECU mate?

[Gtir-keiron]

My mate has a bit of poly pipe made up with a compressor attachment and hooks it up befor the intercooler and pushes compressed air into the plenum via the intercooler.

start psi low and move it up to around 20 psi you will find any leaks at all if they are there.Keep a spray bottle with water handy and a peice of hollow pipe to listen threw .

motor off of coarse.

[GodziRRa]

My mate has a bit of poly pipe made up with a compressor attachment and hooks it up befor the intercooler and pushes compressed air into the plenum via the intercooler.

start psi low and move it up to around 20 psi you will find any leaks at all if they are there.Keep a spray bottle with water handy and a peice of hollow pipe to listen threw .

motor off of coarse.

Sounds like a lot of work.

[xALmoN]

i've read at in the manual that idle speed for the gt-r is 950, with or without aircon when warmed up.

[MrStabby]

The ECU needs to be put into base-idle mode or else when you adjust that screw the ECU will just compensate.

Moo - is that info from the shop manual? My memory is that you unplug the electric connector to the AAC to stop the compensation, then adjust the idle to where you want it, then reconnect.

[Moodles2]

Can be done that way too, I just have a consult cable so just more familiar doing it that way

[blind_elk]

Maybe it's just the tacho is reading a bit high.

[NewKleer]

another cheating way of adjusting idle is to have car warmed up, then watch AAC on consult and turn idle screw until its around 20-25. so depending if the AAC starts at ~20 (then u turn it until AAC starts to go up, then stop) or if it starts high (e.g. 40+) then you're turning it so AAC goes down until it stops going down. but this is when the car is running normally and just having minor issues, if there is something else causing high idle then this might not work.

e.g. i used to have warm start stalls due to AAC being too high (40-50) as idle was set too low and not having enough room to catch falling idle.