Crazy Idle On R34 Gtt

[Bass Junky]

Hey ppls,

I've picked up a crazy idle problem on my R34 GTT.

After a blisteringly fast run at the back track at Deca on the weekend, I seem you have picked up an idle that goes like this.....

1500-1900 rpm, consistant and precise rev between those rpm.

1 second between revs going up and revs coming down.

I have spoken to a couple of well regarded tuners about it and they have both told me the same thing...

I've checked all vacuum/boost lines and nothing that I can see is broken or come off.

AAC seems to be working properly because the thing it hunting for the right idle, hence, working.

Can anyone guess what it is, or has this happened to anyone else? How have you fixed it?

BASS OUT

[gtst93]

It's the iac valve your wax pellet is stuffed I just went through the same thing with mine.

A quick test is to get a pair of multi-grips and slowly clamp the big black hose that goes between the aac valve and your intercooler pipe and your idle should drop back to normal.

Edited February 13, 2007 by gtst93

[Bass Junky]

Okay, do I clamped that hose and sure enough, idle goes back to normal.

So, how does one fix this?

Anyone got any idea how much an IAC valvre costs?

[paulr33]

in the tutorial section is a parts thread by me

look in there, it has the aac valve parts

speak to nissan, it cant be too much

no more than $50 ?

just remembered the part no# is for ecr33, not sure if its diff for er34

[666DAN]

Wax pellet? The AAC in the R34's is a stepper motor that regulates the air flow, positive feedback hence idle regulation.

When my one got stuck open it gave a high idle, it was the piston on the stepper motor literally coked-up with carbon and grime.

I completely stripped it down and clean it, bang perfect!!!

I think the JUN R34 had the same issue.

[paulr33]

good find on the tcs bypass

[NYTSKY]

I have this same problem.Its driving me bananas! Bounces from 1100 to 1600.So if i take off the ACC and give it a good clean with something everything should be ok??

[Downforce]

I've had a similar issue previously, i adjusted the injector pulse by increasing the ms with the hand controller and it went away. When the problem happens, you may notice turning on the air con makes it stop, or vise versa. weird shit.

[Bass Junky]

okay.

Pulled the ACC manifold and assembly out after work today.

Found that the plunger from the coolant bit had snapped. Photos demonstrate what I mean.

I have a replacement loaner, but will get myself a new plunger and refit mine eventually.

Here are pics to show.

[NYTSKY]

OK i pulled my ACC off last night and gave it a good cleaning,But unfortunatley it didnt fix my problem.

Anyone else got any suggestions?

[gtst93]

yer that is your Wax pellet. i don' think you can get it by its self you have to get a new iac valve.

[gtst93]

666DAN just letting you no that the "stepper motor" on the r34 iac valve is actually a electromagnet not a stepper motor. when the coil is energized it pulls the piston back if you no what i mean.

thanks

[LatinR33]

I had the same prob ended up being faulty TPS. Had my car plugged up to a console and reset the tps and cleaned the contacts all sweet

[NYTSKY]

Ill clean the contacts and see what happens.

[discopotato03]

Hi all , I know this is an old thread but does anyone know how to get that cap out on the cold start piston side .

We made a pin tool up but that cap is crazy tight . I'm reluctant to heat the casting up because of the seal that lives inside where the idle speed magnet solenoid gadget goes .

Thanks in advance , cheers from Adrian .

[GTSBoy]

I dunno. Mine just came apart. Just need a decent tool.

[discopotato03]

Hi GTSBoy , we are still struggling with these three pin hole plugs that go over the cold start spring and wax pellet piston thing . We made up a two pin tool and even extended its length for more leverage . All it did was bend the pins , these things are stupid tight .

I have an R34 NA Neo IAC assembly as well as a complete Neo turbo inlet manifold . Neither of the plugs is even looking like moving . If you still have your tool could you post a pic of it please .

Cheers from Adrian . 

[GTSBoy]

Sorry mate. I handed to my bro-in-law, in his workshop, and he handed it back to me about 2 minutes later with the plugs all out. We proceeded to bathe it liberally in the most aggressive solvents we could find, then reassembled. From what I gathered, it wasn't hard to get it apart.

[Us3rNaMeD]

Small gravedig but can anyone explain to me how to take apart the aac solenoid/electromagnet that 666dan and gtst93 are referring to?

[GTSBoy]

You can't take the solenoid itself apart.

You can dismantle the valve (ie, remove the solenoid, remove the plugs to access the internal galleries, etc).