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Crazy Idle On R34 Gtt

Bass Junky

By Bass Junky,
in Engines & Forced Induction

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Bass Junky Grand Master

Bass Junky

Posted
Posted

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

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gtst93 Collaborator

gtst93

Posted
Posted (edited)

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 by gtst93
paulr33 Grand Master

paulr33

Posted
Posted

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 Grand Master

666DAN

Posted
Posted

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.

Downforce Grand Master

Downforce

Posted
Posted

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 Grand Master

Bass Junky

Posted
  • Author
Posted

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.

post-6399-1171436404.jpg

post-6399-1171436432.jpg

post-6399-1171436521.jpg

  • 12 years later...
discopotato03 Grand Master

discopotato03

Posted
Posted

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 .

discopotato03 Grand Master

discopotato03

Posted
Posted

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 Grand Master

GTSBoy

Posted
Posted

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.

  • 1 year later...

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