R34 Gtt Dramas

[gtst93]

Hi guys,

Got a little problem with my 34 Basically this is what it does. When I first start it up it sits at 3000rpm for about 5secs then drops down and hunts between 1000-2000rpm. Also when I’m driving and back off the throttle has a small delay and then starts decelerating other than that it runs fine.

Any ideas would be much appreciated

Thanks.

[666DAN]

Take off the AAC valve at the rear of the plenum, clean the piston attached to the stepper motor on the inside. It can clog with carbon and crap which makes it stay open and raise the revs. This would be a good start.

[GreddyGo]

Check the tutorial section, there is a good write up in there on how to do it!

Cheers

Josh

[gtst93]

Cleaned aac still the same. but when i disconnect the stepper motor it doesn't make any difference could it be stuffed?

[666DAN]

It could be stuffed...not being picky, but did you clean it really well. My one was soo coked-up it was solid, I had to soak it in metho to get the 'piston' out.

Basically unscrew the stepper out and remove all components.

[gtst93]

yep its clean. the piston fell out by its self when i first took the stepper motor off.

[666DAN]

I'll check my one tonight, I'll see if the revs 100% change if you unplug it..if they do then your unit could be faulty.

If not, back to the drawing board

[gtst93]

thanks for your help

[No Crust Racing]

If a solid AAC clean doesn't do it, try cleaning your AFM also.

Let us know how you go.

[666DAN]

OK, unplugging the the AAC valve on my car made it almost stall and start hunting at low rpm. I'd say there is something up with yours if it doesn affect the idling.

[gtst93]

thanks for that i'll get anotherone and let you no how i go.

Cleaned the afm at the same time as the acc valve

Thanks

[ANG32]

My R34, since I changed HKS exhaust and trust in-take then I have missed fire especially when pushing hard in 1 & 2 gears. Anyone have any idea of how to fit it?

[gtst93]

what gap are your plugs at?

[SKY 34]

clean afm using contact cleaner..often happens

I heard several ppl having same missfiring problems after they change to 3" exhaust and fixed it by changing spark plug gap...don't know the details but it's here somewhere 5-6 months back I think

[gtst93]

does anyone no what voltage goes to the aac valve mine only has 10V. is this ok, oh and i found out its a electro magnet not a stepper motor.