Jump to content
SAU Community

Recommended Posts

Hey guys i've had this problem for a while but havnt been too worried about it.

When the car is idling it might idle nice for about 10s or so then starts idling up and down, usually between 1k and 1.5k. I just got the car tuned last week and it seemed fine for a while but i've had this issue before the new rb25 went in.

I dont think its a problem w/ the tune and i read somewhere it could be the thermo sensor?

Does anyone know whats causing this? Or if someone knows and wants a quick cashy i have some $50 westfield / karrinyup shopping vouchers =D

Any help is appriciated

Link to comment
https://www.sau.com.au/forums/topic/283242-hunting-rough-idle/
Share on other sites

Hey guys i've had this problem for a while but havnt been too worried about it.

When the car is idling it might idle nice for about 10s or so then starts idling up and down, usually between 1k and 1.5k. I just got the car tuned last week and it seemed fine for a while but i've had this issue before the new rb25 went in.

I dont think its a problem w/ the tune and i read somewhere it could be the thermo sensor?

Does anyone know whats causing this? Or if someone knows and wants a quick cashy i have some $50 westfield / karrinyup shopping vouchers =D

Any help is appriciated

go check out the DIY subforum, theres a tutorial on cleaning the AAC (Auxiliary Air Control Valve). It seems to be the number 1 cause of this and it was for me too.

just to drop in another idea which i found on a mates car the other day. Same deal, would hunt on idle nd run rough on idle.

What was happening was the bushes on the throttle body were worn, allowing the butterfly shaft to "wander" and would not seal properly, hence sucking air through the bushes bypassing the air flow meter

to check, i grabbed the throttle and pushed it closed. when i did this the car almost stalled and hunted worse than ever

i have never seen it before on a skyline, but just one of those weird things that happens :D

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Yeah, it's getting like that, my daughter is coming over on Thursday to help me remove the bonnet so I can install the Carbuilders underbonnet stuff,  I might get her to give me a hand and remove the hardtop, maybe, because on really hot days the detachable hardtop helps the aircon keep the interior cool, the heat just punches straight through to rag top I also don't have enough hair for the "wind in the hair" experience, so there is that....LOL
    • Could be falling edge/rising edge is set wrong. Are you getting sync errors?
    • On BMWs what I do because I'm more confident that I can't instantly crush the pinch welds and do thousands of USD in chassis damage is use a set of rubber jacking pads designed to protect the chassis/plastic adapter and raise a corner of the car, place the aforementioned 2x12 inch wooden planks under a tire, drop the car, then this normally gives me enough clearance to get to the front central jack point. If you don't need it to be a ramp it only needs to be 1-1.5 feet long. On my R33 I do not trust the pinch welds to tolerate any of this so I drive up on the ramps. Before then when I had to get a new floor jack that no longer cleared the front lip I removed it to get enough clearance to put the jack under it. Once you're on the ramps once you simply never let the car down to the ground. It lives on the ramps or on jack stands.
    • Nah. You need 2x taps for anything that you cannot pass the tap all the way through. And even then, there's a point in response to the above which I will come back to. The 2x taps are 1x tapered for starting, and 1x plug tap for working to the bottom of blind holes. That block's port is effectively a blind hole from the perspective of the tap. The tapered tap/tapered thread response. You don't ever leave a female hole tapered. They are supposed to be parallel, hence the wide section of a tapered tap being parallel, the existince of plug taps, etc. The male is tapered so that it will eventually get too fat for the female thread, and yes, there is some risk if the tapped length of the female hole doesn't offer enough threads, that it will not lock up very nicely. But you can always buzz off the extra length on the male thread, and the tape is very good at adding bulk to the joint.
    • Nice....looking forward to that update
×
×
  • Create New...